Self- and air-broadened line shape parameters in the ν2+ν3 band of 12CH4: 4500–4630cm−1
Accurate knowledge of spectral line shape parameters is important for infrared transmission and radiance calculations in the terrestrial atmosphere. In this paper, we report the self- and air-broadened Lorentz half-widths, pressure-induced shifts and line mixing coefficients (via off-diagonal relaxa...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Devi, V. Malathy [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2015transfer abstract |
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| Schlagwörter: |
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| Umfang: |
17 |
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| Übergeordnetes Werk: |
Enthalten in: Self-supervised multimodal reconstruction pre-training for retinal computer-aided diagnosis - Hervella, Álvaro S. ELSEVIER, 2021, JQSRT, New York, NY [u.a.] |
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| Übergeordnetes Werk: |
volume:152 ; year:2015 ; pages:149-165 ; extent:17 |
| Links: |
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| DOI / URN: |
10.1016/j.jqsrt.2014.11.011 |
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ELV039924017 |
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| 520 | |a Accurate knowledge of spectral line shape parameters is important for infrared transmission and radiance calculations in the terrestrial atmosphere. In this paper, we report the self- and air-broadened Lorentz half-widths, pressure-induced shifts and line mixing coefficients (via off-diagonal relaxation matrix elements) along with their temperature dependences for methane ν2+ν3 absorption lines in the 4500–4630cm−1 region of the Octad. For this, we recorded 14 high-resolution, high signal to noise ratio (S/N) spectra of high-purity (99.95% 12C-enriched) samples of pure methane and its dilute mixtures in dry air between 298K and 148K. A Bruker IFS 125HR Fourier transform spectrometer (FTS) at the Jet Propulsion Laboratory, Pasadena, California, was used to obtain the experimental data. The absorption cell used for this study was a specially built 20.38cm long coolable cell installed in its sample compartment. The sample pressures for the pure 12CH4 spectra were 4.5−385Torr; for the air-broadened spectra the total pressures ranged between 95 and 300Torr with the methane volume mixing ratios between 0.04 and 0.097. All 14 spectra were fitted simultaneously using an interactive multispectrum nonlinear least-squares curve fitting technique. The results are compared to values reported in the literature. | ||
| 520 | |a Accurate knowledge of spectral line shape parameters is important for infrared transmission and radiance calculations in the terrestrial atmosphere. In this paper, we report the self- and air-broadened Lorentz half-widths, pressure-induced shifts and line mixing coefficients (via off-diagonal relaxation matrix elements) along with their temperature dependences for methane ν2+ν3 absorption lines in the 4500–4630cm−1 region of the Octad. For this, we recorded 14 high-resolution, high signal to noise ratio (S/N) spectra of high-purity (99.95% 12C-enriched) samples of pure methane and its dilute mixtures in dry air between 298K and 148K. A Bruker IFS 125HR Fourier transform spectrometer (FTS) at the Jet Propulsion Laboratory, Pasadena, California, was used to obtain the experimental data. The absorption cell used for this study was a specially built 20.38cm long coolable cell installed in its sample compartment. The sample pressures for the pure 12CH4 spectra were 4.5−385Torr; for the air-broadened spectra the total pressures ranged between 95 and 300Torr with the methane volume mixing ratios between 0.04 and 0.097. All 14 spectra were fitted simultaneously using an interactive multispectrum nonlinear least-squares curve fitting technique. The results are compared to values reported in the literature. | ||
| 650 | 7 | |a Methane |2 Elsevier | |
| 650 | 7 | |a Temperature dependence |2 Elsevier | |
| 650 | 7 | |a Relaxation matrix |2 Elsevier | |
| 650 | 7 | |a Pressure-shift |2 Elsevier | |
| 650 | 7 | |a Speed dependence |2 Elsevier | |
| 650 | 7 | |a Lorentz width |2 Elsevier | |
| 700 | 1 | |a Benner, D. Chris |4 oth | |
| 700 | 1 | |a Smith, Mary Ann H. |4 oth | |
| 700 | 1 | |a Mantz, Arlan W. |4 oth | |
| 700 | 1 | |a Sung, Keeyoon |4 oth | |
| 700 | 1 | |a Crawford, Timothy J. |4 oth | |
| 700 | 1 | |a Predoi-Cross, Adriana |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |n Elsevier |a Hervella, Álvaro S. ELSEVIER |t Self-supervised multimodal reconstruction pre-training for retinal computer-aided diagnosis |d 2021 |d JQSRT |g New York, NY [u.a.] |w (DE-627)ELV006657966 |
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10.1016/j.jqsrt.2014.11.011 doi GBVA2015023000007.pica (DE-627)ELV039924017 (ELSEVIER)S0022-4073(14)00461-0 DE-627 ger DE-627 rakwb eng 530 530 DE-600 004 VZ 54.72 bkl Devi, V. Malathy verfasserin aut Self- and air-broadened line shape parameters in the ν2+ν3 band of 12CH4: 4500–4630cm−1 2015transfer abstract 17 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Accurate knowledge of spectral line shape parameters is important for infrared transmission and radiance calculations in the terrestrial atmosphere. In this paper, we report the self- and air-broadened Lorentz half-widths, pressure-induced shifts and line mixing coefficients (via off-diagonal relaxation matrix elements) along with their temperature dependences for methane ν2+ν3 absorption lines in the 4500–4630cm−1 region of the Octad. For this, we recorded 14 high-resolution, high signal to noise ratio (S/N) spectra of high-purity (99.95% 12C-enriched) samples of pure methane and its dilute mixtures in dry air between 298K and 148K. A Bruker IFS 125HR Fourier transform spectrometer (FTS) at the Jet Propulsion Laboratory, Pasadena, California, was used to obtain the experimental data. The absorption cell used for this study was a specially built 20.38cm long coolable cell installed in its sample compartment. The sample pressures for the pure 12CH4 spectra were 4.5−385Torr; for the air-broadened spectra the total pressures ranged between 95 and 300Torr with the methane volume mixing ratios between 0.04 and 0.097. All 14 spectra were fitted simultaneously using an interactive multispectrum nonlinear least-squares curve fitting technique. The results are compared to values reported in the literature. Accurate knowledge of spectral line shape parameters is important for infrared transmission and radiance calculations in the terrestrial atmosphere. In this paper, we report the self- and air-broadened Lorentz half-widths, pressure-induced shifts and line mixing coefficients (via off-diagonal relaxation matrix elements) along with their temperature dependences for methane ν2+ν3 absorption lines in the 4500–4630cm−1 region of the Octad. For this, we recorded 14 high-resolution, high signal to noise ratio (S/N) spectra of high-purity (99.95% 12C-enriched) samples of pure methane and its dilute mixtures in dry air between 298K and 148K. A Bruker IFS 125HR Fourier transform spectrometer (FTS) at the Jet Propulsion Laboratory, Pasadena, California, was used to obtain the experimental data. The absorption cell used for this study was a specially built 20.38cm long coolable cell installed in its sample compartment. The sample pressures for the pure 12CH4 spectra were 4.5−385Torr; for the air-broadened spectra the total pressures ranged between 95 and 300Torr with the methane volume mixing ratios between 0.04 and 0.097. All 14 spectra were fitted simultaneously using an interactive multispectrum nonlinear least-squares curve fitting technique. The results are compared to values reported in the literature. Methane Elsevier Temperature dependence Elsevier Relaxation matrix Elsevier Pressure-shift Elsevier Speed dependence Elsevier Lorentz width Elsevier Benner, D. Chris oth Smith, Mary Ann H. oth Mantz, Arlan W. oth Sung, Keeyoon oth Crawford, Timothy J. oth Predoi-Cross, Adriana oth Enthalten in Elsevier Hervella, Álvaro S. ELSEVIER Self-supervised multimodal reconstruction pre-training for retinal computer-aided diagnosis 2021 JQSRT New York, NY [u.a.] (DE-627)ELV006657966 volume:152 year:2015 pages:149-165 extent:17 https://doi.org/10.1016/j.jqsrt.2014.11.011 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 54.72 Künstliche Intelligenz VZ AR 152 2015 149-165 17 045F 530 |
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10.1016/j.jqsrt.2014.11.011 doi GBVA2015023000007.pica (DE-627)ELV039924017 (ELSEVIER)S0022-4073(14)00461-0 DE-627 ger DE-627 rakwb eng 530 530 DE-600 004 VZ 54.72 bkl Devi, V. Malathy verfasserin aut Self- and air-broadened line shape parameters in the ν2+ν3 band of 12CH4: 4500–4630cm−1 2015transfer abstract 17 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Accurate knowledge of spectral line shape parameters is important for infrared transmission and radiance calculations in the terrestrial atmosphere. In this paper, we report the self- and air-broadened Lorentz half-widths, pressure-induced shifts and line mixing coefficients (via off-diagonal relaxation matrix elements) along with their temperature dependences for methane ν2+ν3 absorption lines in the 4500–4630cm−1 region of the Octad. For this, we recorded 14 high-resolution, high signal to noise ratio (S/N) spectra of high-purity (99.95% 12C-enriched) samples of pure methane and its dilute mixtures in dry air between 298K and 148K. A Bruker IFS 125HR Fourier transform spectrometer (FTS) at the Jet Propulsion Laboratory, Pasadena, California, was used to obtain the experimental data. The absorption cell used for this study was a specially built 20.38cm long coolable cell installed in its sample compartment. The sample pressures for the pure 12CH4 spectra were 4.5−385Torr; for the air-broadened spectra the total pressures ranged between 95 and 300Torr with the methane volume mixing ratios between 0.04 and 0.097. All 14 spectra were fitted simultaneously using an interactive multispectrum nonlinear least-squares curve fitting technique. The results are compared to values reported in the literature. Accurate knowledge of spectral line shape parameters is important for infrared transmission and radiance calculations in the terrestrial atmosphere. In this paper, we report the self- and air-broadened Lorentz half-widths, pressure-induced shifts and line mixing coefficients (via off-diagonal relaxation matrix elements) along with their temperature dependences for methane ν2+ν3 absorption lines in the 4500–4630cm−1 region of the Octad. For this, we recorded 14 high-resolution, high signal to noise ratio (S/N) spectra of high-purity (99.95% 12C-enriched) samples of pure methane and its dilute mixtures in dry air between 298K and 148K. A Bruker IFS 125HR Fourier transform spectrometer (FTS) at the Jet Propulsion Laboratory, Pasadena, California, was used to obtain the experimental data. The absorption cell used for this study was a specially built 20.38cm long coolable cell installed in its sample compartment. The sample pressures for the pure 12CH4 spectra were 4.5−385Torr; for the air-broadened spectra the total pressures ranged between 95 and 300Torr with the methane volume mixing ratios between 0.04 and 0.097. All 14 spectra were fitted simultaneously using an interactive multispectrum nonlinear least-squares curve fitting technique. The results are compared to values reported in the literature. Methane Elsevier Temperature dependence Elsevier Relaxation matrix Elsevier Pressure-shift Elsevier Speed dependence Elsevier Lorentz width Elsevier Benner, D. Chris oth Smith, Mary Ann H. oth Mantz, Arlan W. oth Sung, Keeyoon oth Crawford, Timothy J. oth Predoi-Cross, Adriana oth Enthalten in Elsevier Hervella, Álvaro S. ELSEVIER Self-supervised multimodal reconstruction pre-training for retinal computer-aided diagnosis 2021 JQSRT New York, NY [u.a.] (DE-627)ELV006657966 volume:152 year:2015 pages:149-165 extent:17 https://doi.org/10.1016/j.jqsrt.2014.11.011 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 54.72 Künstliche Intelligenz VZ AR 152 2015 149-165 17 045F 530 |
| allfields_unstemmed |
10.1016/j.jqsrt.2014.11.011 doi GBVA2015023000007.pica (DE-627)ELV039924017 (ELSEVIER)S0022-4073(14)00461-0 DE-627 ger DE-627 rakwb eng 530 530 DE-600 004 VZ 54.72 bkl Devi, V. Malathy verfasserin aut Self- and air-broadened line shape parameters in the ν2+ν3 band of 12CH4: 4500–4630cm−1 2015transfer abstract 17 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Accurate knowledge of spectral line shape parameters is important for infrared transmission and radiance calculations in the terrestrial atmosphere. In this paper, we report the self- and air-broadened Lorentz half-widths, pressure-induced shifts and line mixing coefficients (via off-diagonal relaxation matrix elements) along with their temperature dependences for methane ν2+ν3 absorption lines in the 4500–4630cm−1 region of the Octad. For this, we recorded 14 high-resolution, high signal to noise ratio (S/N) spectra of high-purity (99.95% 12C-enriched) samples of pure methane and its dilute mixtures in dry air between 298K and 148K. A Bruker IFS 125HR Fourier transform spectrometer (FTS) at the Jet Propulsion Laboratory, Pasadena, California, was used to obtain the experimental data. The absorption cell used for this study was a specially built 20.38cm long coolable cell installed in its sample compartment. The sample pressures for the pure 12CH4 spectra were 4.5−385Torr; for the air-broadened spectra the total pressures ranged between 95 and 300Torr with the methane volume mixing ratios between 0.04 and 0.097. All 14 spectra were fitted simultaneously using an interactive multispectrum nonlinear least-squares curve fitting technique. The results are compared to values reported in the literature. Accurate knowledge of spectral line shape parameters is important for infrared transmission and radiance calculations in the terrestrial atmosphere. In this paper, we report the self- and air-broadened Lorentz half-widths, pressure-induced shifts and line mixing coefficients (via off-diagonal relaxation matrix elements) along with their temperature dependences for methane ν2+ν3 absorption lines in the 4500–4630cm−1 region of the Octad. For this, we recorded 14 high-resolution, high signal to noise ratio (S/N) spectra of high-purity (99.95% 12C-enriched) samples of pure methane and its dilute mixtures in dry air between 298K and 148K. A Bruker IFS 125HR Fourier transform spectrometer (FTS) at the Jet Propulsion Laboratory, Pasadena, California, was used to obtain the experimental data. The absorption cell used for this study was a specially built 20.38cm long coolable cell installed in its sample compartment. The sample pressures for the pure 12CH4 spectra were 4.5−385Torr; for the air-broadened spectra the total pressures ranged between 95 and 300Torr with the methane volume mixing ratios between 0.04 and 0.097. All 14 spectra were fitted simultaneously using an interactive multispectrum nonlinear least-squares curve fitting technique. The results are compared to values reported in the literature. Methane Elsevier Temperature dependence Elsevier Relaxation matrix Elsevier Pressure-shift Elsevier Speed dependence Elsevier Lorentz width Elsevier Benner, D. Chris oth Smith, Mary Ann H. oth Mantz, Arlan W. oth Sung, Keeyoon oth Crawford, Timothy J. oth Predoi-Cross, Adriana oth Enthalten in Elsevier Hervella, Álvaro S. ELSEVIER Self-supervised multimodal reconstruction pre-training for retinal computer-aided diagnosis 2021 JQSRT New York, NY [u.a.] (DE-627)ELV006657966 volume:152 year:2015 pages:149-165 extent:17 https://doi.org/10.1016/j.jqsrt.2014.11.011 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 54.72 Künstliche Intelligenz VZ AR 152 2015 149-165 17 045F 530 |
| allfieldsGer |
10.1016/j.jqsrt.2014.11.011 doi GBVA2015023000007.pica (DE-627)ELV039924017 (ELSEVIER)S0022-4073(14)00461-0 DE-627 ger DE-627 rakwb eng 530 530 DE-600 004 VZ 54.72 bkl Devi, V. Malathy verfasserin aut Self- and air-broadened line shape parameters in the ν2+ν3 band of 12CH4: 4500–4630cm−1 2015transfer abstract 17 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Accurate knowledge of spectral line shape parameters is important for infrared transmission and radiance calculations in the terrestrial atmosphere. In this paper, we report the self- and air-broadened Lorentz half-widths, pressure-induced shifts and line mixing coefficients (via off-diagonal relaxation matrix elements) along with their temperature dependences for methane ν2+ν3 absorption lines in the 4500–4630cm−1 region of the Octad. For this, we recorded 14 high-resolution, high signal to noise ratio (S/N) spectra of high-purity (99.95% 12C-enriched) samples of pure methane and its dilute mixtures in dry air between 298K and 148K. A Bruker IFS 125HR Fourier transform spectrometer (FTS) at the Jet Propulsion Laboratory, Pasadena, California, was used to obtain the experimental data. The absorption cell used for this study was a specially built 20.38cm long coolable cell installed in its sample compartment. The sample pressures for the pure 12CH4 spectra were 4.5−385Torr; for the air-broadened spectra the total pressures ranged between 95 and 300Torr with the methane volume mixing ratios between 0.04 and 0.097. All 14 spectra were fitted simultaneously using an interactive multispectrum nonlinear least-squares curve fitting technique. The results are compared to values reported in the literature. Accurate knowledge of spectral line shape parameters is important for infrared transmission and radiance calculations in the terrestrial atmosphere. In this paper, we report the self- and air-broadened Lorentz half-widths, pressure-induced shifts and line mixing coefficients (via off-diagonal relaxation matrix elements) along with their temperature dependences for methane ν2+ν3 absorption lines in the 4500–4630cm−1 region of the Octad. For this, we recorded 14 high-resolution, high signal to noise ratio (S/N) spectra of high-purity (99.95% 12C-enriched) samples of pure methane and its dilute mixtures in dry air between 298K and 148K. A Bruker IFS 125HR Fourier transform spectrometer (FTS) at the Jet Propulsion Laboratory, Pasadena, California, was used to obtain the experimental data. The absorption cell used for this study was a specially built 20.38cm long coolable cell installed in its sample compartment. The sample pressures for the pure 12CH4 spectra were 4.5−385Torr; for the air-broadened spectra the total pressures ranged between 95 and 300Torr with the methane volume mixing ratios between 0.04 and 0.097. All 14 spectra were fitted simultaneously using an interactive multispectrum nonlinear least-squares curve fitting technique. The results are compared to values reported in the literature. Methane Elsevier Temperature dependence Elsevier Relaxation matrix Elsevier Pressure-shift Elsevier Speed dependence Elsevier Lorentz width Elsevier Benner, D. Chris oth Smith, Mary Ann H. oth Mantz, Arlan W. oth Sung, Keeyoon oth Crawford, Timothy J. oth Predoi-Cross, Adriana oth Enthalten in Elsevier Hervella, Álvaro S. ELSEVIER Self-supervised multimodal reconstruction pre-training for retinal computer-aided diagnosis 2021 JQSRT New York, NY [u.a.] (DE-627)ELV006657966 volume:152 year:2015 pages:149-165 extent:17 https://doi.org/10.1016/j.jqsrt.2014.11.011 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 54.72 Künstliche Intelligenz VZ AR 152 2015 149-165 17 045F 530 |
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10.1016/j.jqsrt.2014.11.011 doi GBVA2015023000007.pica (DE-627)ELV039924017 (ELSEVIER)S0022-4073(14)00461-0 DE-627 ger DE-627 rakwb eng 530 530 DE-600 004 VZ 54.72 bkl Devi, V. Malathy verfasserin aut Self- and air-broadened line shape parameters in the ν2+ν3 band of 12CH4: 4500–4630cm−1 2015transfer abstract 17 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Accurate knowledge of spectral line shape parameters is important for infrared transmission and radiance calculations in the terrestrial atmosphere. In this paper, we report the self- and air-broadened Lorentz half-widths, pressure-induced shifts and line mixing coefficients (via off-diagonal relaxation matrix elements) along with their temperature dependences for methane ν2+ν3 absorption lines in the 4500–4630cm−1 region of the Octad. For this, we recorded 14 high-resolution, high signal to noise ratio (S/N) spectra of high-purity (99.95% 12C-enriched) samples of pure methane and its dilute mixtures in dry air between 298K and 148K. A Bruker IFS 125HR Fourier transform spectrometer (FTS) at the Jet Propulsion Laboratory, Pasadena, California, was used to obtain the experimental data. The absorption cell used for this study was a specially built 20.38cm long coolable cell installed in its sample compartment. The sample pressures for the pure 12CH4 spectra were 4.5−385Torr; for the air-broadened spectra the total pressures ranged between 95 and 300Torr with the methane volume mixing ratios between 0.04 and 0.097. All 14 spectra were fitted simultaneously using an interactive multispectrum nonlinear least-squares curve fitting technique. The results are compared to values reported in the literature. Accurate knowledge of spectral line shape parameters is important for infrared transmission and radiance calculations in the terrestrial atmosphere. In this paper, we report the self- and air-broadened Lorentz half-widths, pressure-induced shifts and line mixing coefficients (via off-diagonal relaxation matrix elements) along with their temperature dependences for methane ν2+ν3 absorption lines in the 4500–4630cm−1 region of the Octad. For this, we recorded 14 high-resolution, high signal to noise ratio (S/N) spectra of high-purity (99.95% 12C-enriched) samples of pure methane and its dilute mixtures in dry air between 298K and 148K. A Bruker IFS 125HR Fourier transform spectrometer (FTS) at the Jet Propulsion Laboratory, Pasadena, California, was used to obtain the experimental data. The absorption cell used for this study was a specially built 20.38cm long coolable cell installed in its sample compartment. The sample pressures for the pure 12CH4 spectra were 4.5−385Torr; for the air-broadened spectra the total pressures ranged between 95 and 300Torr with the methane volume mixing ratios between 0.04 and 0.097. All 14 spectra were fitted simultaneously using an interactive multispectrum nonlinear least-squares curve fitting technique. The results are compared to values reported in the literature. Methane Elsevier Temperature dependence Elsevier Relaxation matrix Elsevier Pressure-shift Elsevier Speed dependence Elsevier Lorentz width Elsevier Benner, D. Chris oth Smith, Mary Ann H. oth Mantz, Arlan W. oth Sung, Keeyoon oth Crawford, Timothy J. oth Predoi-Cross, Adriana oth Enthalten in Elsevier Hervella, Álvaro S. ELSEVIER Self-supervised multimodal reconstruction pre-training for retinal computer-aided diagnosis 2021 JQSRT New York, NY [u.a.] (DE-627)ELV006657966 volume:152 year:2015 pages:149-165 extent:17 https://doi.org/10.1016/j.jqsrt.2014.11.011 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 54.72 Künstliche Intelligenz VZ AR 152 2015 149-165 17 045F 530 |
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self- and air-broadened line shape parameters in the ν2+ν3 band of 12ch4: 4500–4630cm−1 |
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Self- and air-broadened line shape parameters in the ν2+ν3 band of 12CH4: 4500–4630cm−1 |
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Accurate knowledge of spectral line shape parameters is important for infrared transmission and radiance calculations in the terrestrial atmosphere. In this paper, we report the self- and air-broadened Lorentz half-widths, pressure-induced shifts and line mixing coefficients (via off-diagonal relaxation matrix elements) along with their temperature dependences for methane ν2+ν3 absorption lines in the 4500–4630cm−1 region of the Octad. For this, we recorded 14 high-resolution, high signal to noise ratio (S/N) spectra of high-purity (99.95% 12C-enriched) samples of pure methane and its dilute mixtures in dry air between 298K and 148K. A Bruker IFS 125HR Fourier transform spectrometer (FTS) at the Jet Propulsion Laboratory, Pasadena, California, was used to obtain the experimental data. The absorption cell used for this study was a specially built 20.38cm long coolable cell installed in its sample compartment. The sample pressures for the pure 12CH4 spectra were 4.5−385Torr; for the air-broadened spectra the total pressures ranged between 95 and 300Torr with the methane volume mixing ratios between 0.04 and 0.097. All 14 spectra were fitted simultaneously using an interactive multispectrum nonlinear least-squares curve fitting technique. The results are compared to values reported in the literature. |
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Accurate knowledge of spectral line shape parameters is important for infrared transmission and radiance calculations in the terrestrial atmosphere. In this paper, we report the self- and air-broadened Lorentz half-widths, pressure-induced shifts and line mixing coefficients (via off-diagonal relaxation matrix elements) along with their temperature dependences for methane ν2+ν3 absorption lines in the 4500–4630cm−1 region of the Octad. For this, we recorded 14 high-resolution, high signal to noise ratio (S/N) spectra of high-purity (99.95% 12C-enriched) samples of pure methane and its dilute mixtures in dry air between 298K and 148K. A Bruker IFS 125HR Fourier transform spectrometer (FTS) at the Jet Propulsion Laboratory, Pasadena, California, was used to obtain the experimental data. The absorption cell used for this study was a specially built 20.38cm long coolable cell installed in its sample compartment. The sample pressures for the pure 12CH4 spectra were 4.5−385Torr; for the air-broadened spectra the total pressures ranged between 95 and 300Torr with the methane volume mixing ratios between 0.04 and 0.097. All 14 spectra were fitted simultaneously using an interactive multispectrum nonlinear least-squares curve fitting technique. The results are compared to values reported in the literature. |
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Accurate knowledge of spectral line shape parameters is important for infrared transmission and radiance calculations in the terrestrial atmosphere. In this paper, we report the self- and air-broadened Lorentz half-widths, pressure-induced shifts and line mixing coefficients (via off-diagonal relaxation matrix elements) along with their temperature dependences for methane ν2+ν3 absorption lines in the 4500–4630cm−1 region of the Octad. For this, we recorded 14 high-resolution, high signal to noise ratio (S/N) spectra of high-purity (99.95% 12C-enriched) samples of pure methane and its dilute mixtures in dry air between 298K and 148K. A Bruker IFS 125HR Fourier transform spectrometer (FTS) at the Jet Propulsion Laboratory, Pasadena, California, was used to obtain the experimental data. The absorption cell used for this study was a specially built 20.38cm long coolable cell installed in its sample compartment. The sample pressures for the pure 12CH4 spectra were 4.5−385Torr; for the air-broadened spectra the total pressures ranged between 95 and 300Torr with the methane volume mixing ratios between 0.04 and 0.097. All 14 spectra were fitted simultaneously using an interactive multispectrum nonlinear least-squares curve fitting technique. The results are compared to values reported in the literature. |
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