Experimental and theoretical investigation of pulsed step-wise laser excitations of atoms in flames - the role of two-step vs two-photon excitations and dynamical Stark effects
Anomalous lineshapes and signal strengths in two-colour Laser-Enhanced lonization (LEI) spectrometry in flames have been studied both experimentally and theoretically. Experimentally, we have found that both lineshapes and signal strengths from atoms in flames can be significantly affected by the in...
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E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
1992 |
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| Reproduktion: |
Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 |
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in: Spectrochimica Acta Part B: Atomic Spectroscopy - Amsterdam : Elsevier, 47(1992), 2, Seite 245-273 |
| Übergeordnetes Werk: |
volume:47 ; year:1992 ; number:2 ; pages:245-273 |
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| 520 | |a Anomalous lineshapes and signal strengths in two-colour Laser-Enhanced lonization (LEI) spectrometry in flames have been studied both experimentally and theoretically. Experimentally, we have found that both lineshapes and signal strengths from atoms in flames can be significantly affected by the influence of coherent contributions in the excitation process-such as two-photon excitations (i.e. when the atoms simultaneously absorb two photons, one from each laser) and dynamical Stark effects (i.e. interactions between the laser light fields and the atoms causing rapid Rabi oscillations between atomic energy levels which give rise to broadening, splittings and shifts of transitions)-already at the rather moderate laser intensities that are obtained in unfocused pulsed laser beams today. Theoretically, it is found that the normal rate-equation approach is insufficient for describing these kind of phenomena of two-colour LEI in flames. A theory based on density-matrix formalism has been adopted for the situations encountered in LEI in flames. The equations are solved in the steady-state limit using the rotating wave approximation. The finite bandwidths of the lasers are included as phase fluctuations. There is a qualitative agreement between experiments and theory in predicting the LEI signal lineshapes since all the main features of the experiments, such as two-photon peaks, power- and saturation-broadening including splitting of peaks, are present in the theoretical simulations. The quantitative agreement is, however, unsatisfactory, and a refinement of the theory, especially in the description of the properties of the laser light and the collisional broadening and ionization mechanisms, is required for a full agreement between theory and experiments. | ||
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(DE-627)NLEJ188408770 (DE-599)GBVNLZ188408770 DE-627 ger DE-627 rakwb eng Experimental and theoretical investigation of pulsed step-wise laser excitations of atoms in flames - the role of two-step vs two-photon excitations and dynamical Stark effects 1992 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Anomalous lineshapes and signal strengths in two-colour Laser-Enhanced lonization (LEI) spectrometry in flames have been studied both experimentally and theoretically. Experimentally, we have found that both lineshapes and signal strengths from atoms in flames can be significantly affected by the influence of coherent contributions in the excitation process-such as two-photon excitations (i.e. when the atoms simultaneously absorb two photons, one from each laser) and dynamical Stark effects (i.e. interactions between the laser light fields and the atoms causing rapid Rabi oscillations between atomic energy levels which give rise to broadening, splittings and shifts of transitions)-already at the rather moderate laser intensities that are obtained in unfocused pulsed laser beams today. Theoretically, it is found that the normal rate-equation approach is insufficient for describing these kind of phenomena of two-colour LEI in flames. A theory based on density-matrix formalism has been adopted for the situations encountered in LEI in flames. The equations are solved in the steady-state limit using the rotating wave approximation. The finite bandwidths of the lasers are included as phase fluctuations. There is a qualitative agreement between experiments and theory in predicting the LEI signal lineshapes since all the main features of the experiments, such as two-photon peaks, power- and saturation-broadening including splitting of peaks, are present in the theoretical simulations. The quantitative agreement is, however, unsatisfactory, and a refinement of the theory, especially in the description of the properties of the laser light and the collisional broadening and ionization mechanisms, is required for a full agreement between theory and experiments. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Axner, O. oth Sjostrom, S. oth in Spectrochimica Acta Part B: Atomic Spectroscopy Amsterdam : Elsevier 47(1992), 2, Seite 245-273 (DE-627)NLEJ185207464 (DE-600)2032264-1 0584-8547 nnns volume:47 year:1992 number:2 pages:245-273 http://dx.doi.org/10.1016/0584-8547(92)80024-B GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 47 1992 2 245-273 |
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(DE-627)NLEJ188408770 (DE-599)GBVNLZ188408770 DE-627 ger DE-627 rakwb eng Experimental and theoretical investigation of pulsed step-wise laser excitations of atoms in flames - the role of two-step vs two-photon excitations and dynamical Stark effects 1992 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Anomalous lineshapes and signal strengths in two-colour Laser-Enhanced lonization (LEI) spectrometry in flames have been studied both experimentally and theoretically. Experimentally, we have found that both lineshapes and signal strengths from atoms in flames can be significantly affected by the influence of coherent contributions in the excitation process-such as two-photon excitations (i.e. when the atoms simultaneously absorb two photons, one from each laser) and dynamical Stark effects (i.e. interactions between the laser light fields and the atoms causing rapid Rabi oscillations between atomic energy levels which give rise to broadening, splittings and shifts of transitions)-already at the rather moderate laser intensities that are obtained in unfocused pulsed laser beams today. Theoretically, it is found that the normal rate-equation approach is insufficient for describing these kind of phenomena of two-colour LEI in flames. A theory based on density-matrix formalism has been adopted for the situations encountered in LEI in flames. The equations are solved in the steady-state limit using the rotating wave approximation. The finite bandwidths of the lasers are included as phase fluctuations. There is a qualitative agreement between experiments and theory in predicting the LEI signal lineshapes since all the main features of the experiments, such as two-photon peaks, power- and saturation-broadening including splitting of peaks, are present in the theoretical simulations. The quantitative agreement is, however, unsatisfactory, and a refinement of the theory, especially in the description of the properties of the laser light and the collisional broadening and ionization mechanisms, is required for a full agreement between theory and experiments. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Axner, O. oth Sjostrom, S. oth in Spectrochimica Acta Part B: Atomic Spectroscopy Amsterdam : Elsevier 47(1992), 2, Seite 245-273 (DE-627)NLEJ185207464 (DE-600)2032264-1 0584-8547 nnns volume:47 year:1992 number:2 pages:245-273 http://dx.doi.org/10.1016/0584-8547(92)80024-B GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 47 1992 2 245-273 |
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(DE-627)NLEJ188408770 (DE-599)GBVNLZ188408770 DE-627 ger DE-627 rakwb eng Experimental and theoretical investigation of pulsed step-wise laser excitations of atoms in flames - the role of two-step vs two-photon excitations and dynamical Stark effects 1992 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Anomalous lineshapes and signal strengths in two-colour Laser-Enhanced lonization (LEI) spectrometry in flames have been studied both experimentally and theoretically. Experimentally, we have found that both lineshapes and signal strengths from atoms in flames can be significantly affected by the influence of coherent contributions in the excitation process-such as two-photon excitations (i.e. when the atoms simultaneously absorb two photons, one from each laser) and dynamical Stark effects (i.e. interactions between the laser light fields and the atoms causing rapid Rabi oscillations between atomic energy levels which give rise to broadening, splittings and shifts of transitions)-already at the rather moderate laser intensities that are obtained in unfocused pulsed laser beams today. Theoretically, it is found that the normal rate-equation approach is insufficient for describing these kind of phenomena of two-colour LEI in flames. A theory based on density-matrix formalism has been adopted for the situations encountered in LEI in flames. The equations are solved in the steady-state limit using the rotating wave approximation. The finite bandwidths of the lasers are included as phase fluctuations. There is a qualitative agreement between experiments and theory in predicting the LEI signal lineshapes since all the main features of the experiments, such as two-photon peaks, power- and saturation-broadening including splitting of peaks, are present in the theoretical simulations. The quantitative agreement is, however, unsatisfactory, and a refinement of the theory, especially in the description of the properties of the laser light and the collisional broadening and ionization mechanisms, is required for a full agreement between theory and experiments. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Axner, O. oth Sjostrom, S. oth in Spectrochimica Acta Part B: Atomic Spectroscopy Amsterdam : Elsevier 47(1992), 2, Seite 245-273 (DE-627)NLEJ185207464 (DE-600)2032264-1 0584-8547 nnns volume:47 year:1992 number:2 pages:245-273 http://dx.doi.org/10.1016/0584-8547(92)80024-B GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 47 1992 2 245-273 |
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(DE-627)NLEJ188408770 (DE-599)GBVNLZ188408770 DE-627 ger DE-627 rakwb eng Experimental and theoretical investigation of pulsed step-wise laser excitations of atoms in flames - the role of two-step vs two-photon excitations and dynamical Stark effects 1992 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Anomalous lineshapes and signal strengths in two-colour Laser-Enhanced lonization (LEI) spectrometry in flames have been studied both experimentally and theoretically. Experimentally, we have found that both lineshapes and signal strengths from atoms in flames can be significantly affected by the influence of coherent contributions in the excitation process-such as two-photon excitations (i.e. when the atoms simultaneously absorb two photons, one from each laser) and dynamical Stark effects (i.e. interactions between the laser light fields and the atoms causing rapid Rabi oscillations between atomic energy levels which give rise to broadening, splittings and shifts of transitions)-already at the rather moderate laser intensities that are obtained in unfocused pulsed laser beams today. Theoretically, it is found that the normal rate-equation approach is insufficient for describing these kind of phenomena of two-colour LEI in flames. A theory based on density-matrix formalism has been adopted for the situations encountered in LEI in flames. The equations are solved in the steady-state limit using the rotating wave approximation. The finite bandwidths of the lasers are included as phase fluctuations. There is a qualitative agreement between experiments and theory in predicting the LEI signal lineshapes since all the main features of the experiments, such as two-photon peaks, power- and saturation-broadening including splitting of peaks, are present in the theoretical simulations. The quantitative agreement is, however, unsatisfactory, and a refinement of the theory, especially in the description of the properties of the laser light and the collisional broadening and ionization mechanisms, is required for a full agreement between theory and experiments. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Axner, O. oth Sjostrom, S. oth in Spectrochimica Acta Part B: Atomic Spectroscopy Amsterdam : Elsevier 47(1992), 2, Seite 245-273 (DE-627)NLEJ185207464 (DE-600)2032264-1 0584-8547 nnns volume:47 year:1992 number:2 pages:245-273 http://dx.doi.org/10.1016/0584-8547(92)80024-B GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 47 1992 2 245-273 |
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(DE-627)NLEJ188408770 (DE-599)GBVNLZ188408770 DE-627 ger DE-627 rakwb eng Experimental and theoretical investigation of pulsed step-wise laser excitations of atoms in flames - the role of two-step vs two-photon excitations and dynamical Stark effects 1992 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Anomalous lineshapes and signal strengths in two-colour Laser-Enhanced lonization (LEI) spectrometry in flames have been studied both experimentally and theoretically. Experimentally, we have found that both lineshapes and signal strengths from atoms in flames can be significantly affected by the influence of coherent contributions in the excitation process-such as two-photon excitations (i.e. when the atoms simultaneously absorb two photons, one from each laser) and dynamical Stark effects (i.e. interactions between the laser light fields and the atoms causing rapid Rabi oscillations between atomic energy levels which give rise to broadening, splittings and shifts of transitions)-already at the rather moderate laser intensities that are obtained in unfocused pulsed laser beams today. Theoretically, it is found that the normal rate-equation approach is insufficient for describing these kind of phenomena of two-colour LEI in flames. A theory based on density-matrix formalism has been adopted for the situations encountered in LEI in flames. The equations are solved in the steady-state limit using the rotating wave approximation. The finite bandwidths of the lasers are included as phase fluctuations. There is a qualitative agreement between experiments and theory in predicting the LEI signal lineshapes since all the main features of the experiments, such as two-photon peaks, power- and saturation-broadening including splitting of peaks, are present in the theoretical simulations. The quantitative agreement is, however, unsatisfactory, and a refinement of the theory, especially in the description of the properties of the laser light and the collisional broadening and ionization mechanisms, is required for a full agreement between theory and experiments. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Axner, O. oth Sjostrom, S. oth in Spectrochimica Acta Part B: Atomic Spectroscopy Amsterdam : Elsevier 47(1992), 2, Seite 245-273 (DE-627)NLEJ185207464 (DE-600)2032264-1 0584-8547 nnns volume:47 year:1992 number:2 pages:245-273 http://dx.doi.org/10.1016/0584-8547(92)80024-B GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 47 1992 2 245-273 |
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Experimental and theoretical investigation of pulsed step-wise laser excitations of atoms in flames - the role of two-step vs two-photon excitations and dynamical Stark effects |
| abstract |
Anomalous lineshapes and signal strengths in two-colour Laser-Enhanced lonization (LEI) spectrometry in flames have been studied both experimentally and theoretically. Experimentally, we have found that both lineshapes and signal strengths from atoms in flames can be significantly affected by the influence of coherent contributions in the excitation process-such as two-photon excitations (i.e. when the atoms simultaneously absorb two photons, one from each laser) and dynamical Stark effects (i.e. interactions between the laser light fields and the atoms causing rapid Rabi oscillations between atomic energy levels which give rise to broadening, splittings and shifts of transitions)-already at the rather moderate laser intensities that are obtained in unfocused pulsed laser beams today. Theoretically, it is found that the normal rate-equation approach is insufficient for describing these kind of phenomena of two-colour LEI in flames. A theory based on density-matrix formalism has been adopted for the situations encountered in LEI in flames. The equations are solved in the steady-state limit using the rotating wave approximation. The finite bandwidths of the lasers are included as phase fluctuations. There is a qualitative agreement between experiments and theory in predicting the LEI signal lineshapes since all the main features of the experiments, such as two-photon peaks, power- and saturation-broadening including splitting of peaks, are present in the theoretical simulations. The quantitative agreement is, however, unsatisfactory, and a refinement of the theory, especially in the description of the properties of the laser light and the collisional broadening and ionization mechanisms, is required for a full agreement between theory and experiments. |
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Anomalous lineshapes and signal strengths in two-colour Laser-Enhanced lonization (LEI) spectrometry in flames have been studied both experimentally and theoretically. Experimentally, we have found that both lineshapes and signal strengths from atoms in flames can be significantly affected by the influence of coherent contributions in the excitation process-such as two-photon excitations (i.e. when the atoms simultaneously absorb two photons, one from each laser) and dynamical Stark effects (i.e. interactions between the laser light fields and the atoms causing rapid Rabi oscillations between atomic energy levels which give rise to broadening, splittings and shifts of transitions)-already at the rather moderate laser intensities that are obtained in unfocused pulsed laser beams today. Theoretically, it is found that the normal rate-equation approach is insufficient for describing these kind of phenomena of two-colour LEI in flames. A theory based on density-matrix formalism has been adopted for the situations encountered in LEI in flames. The equations are solved in the steady-state limit using the rotating wave approximation. The finite bandwidths of the lasers are included as phase fluctuations. There is a qualitative agreement between experiments and theory in predicting the LEI signal lineshapes since all the main features of the experiments, such as two-photon peaks, power- and saturation-broadening including splitting of peaks, are present in the theoretical simulations. The quantitative agreement is, however, unsatisfactory, and a refinement of the theory, especially in the description of the properties of the laser light and the collisional broadening and ionization mechanisms, is required for a full agreement between theory and experiments. |
| abstract_unstemmed |
Anomalous lineshapes and signal strengths in two-colour Laser-Enhanced lonization (LEI) spectrometry in flames have been studied both experimentally and theoretically. Experimentally, we have found that both lineshapes and signal strengths from atoms in flames can be significantly affected by the influence of coherent contributions in the excitation process-such as two-photon excitations (i.e. when the atoms simultaneously absorb two photons, one from each laser) and dynamical Stark effects (i.e. interactions between the laser light fields and the atoms causing rapid Rabi oscillations between atomic energy levels which give rise to broadening, splittings and shifts of transitions)-already at the rather moderate laser intensities that are obtained in unfocused pulsed laser beams today. Theoretically, it is found that the normal rate-equation approach is insufficient for describing these kind of phenomena of two-colour LEI in flames. A theory based on density-matrix formalism has been adopted for the situations encountered in LEI in flames. The equations are solved in the steady-state limit using the rotating wave approximation. The finite bandwidths of the lasers are included as phase fluctuations. There is a qualitative agreement between experiments and theory in predicting the LEI signal lineshapes since all the main features of the experiments, such as two-photon peaks, power- and saturation-broadening including splitting of peaks, are present in the theoretical simulations. The quantitative agreement is, however, unsatisfactory, and a refinement of the theory, especially in the description of the properties of the laser light and the collisional broadening and ionization mechanisms, is required for a full agreement between theory and experiments. |
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<?xml version="1.0" encoding="UTF-8"?><collection xmlns="http://www.loc.gov/MARC21/slim"><record><leader>01000caa a22002652 4500</leader><controlfield tag="001">NLEJ188408770</controlfield><controlfield tag="003">DE-627</controlfield><controlfield tag="005">20210707100509.0</controlfield><controlfield tag="007">cr uuu---uuuuu</controlfield><controlfield tag="008">070506s1992 xx |||||o 00| ||eng c</controlfield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-627)NLEJ188408770</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-599)GBVNLZ188408770</subfield></datafield><datafield tag="040" ind1=" " ind2=" "><subfield code="a">DE-627</subfield><subfield code="b">ger</subfield><subfield code="c">DE-627</subfield><subfield code="e">rakwb</subfield></datafield><datafield tag="041" ind1=" " ind2=" "><subfield code="a">eng</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Experimental and theoretical investigation of pulsed step-wise laser excitations of atoms in flames - the role of two-step vs two-photon excitations and dynamical Stark effects</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="c">1992</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">nicht spezifiziert</subfield><subfield code="b">zzz</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">nicht spezifiziert</subfield><subfield code="b">z</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">nicht spezifiziert</subfield><subfield code="b">zu</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">Anomalous lineshapes and signal strengths in two-colour Laser-Enhanced lonization (LEI) spectrometry in flames have been studied both experimentally and theoretically. Experimentally, we have found that both lineshapes and signal strengths from atoms in flames can be significantly affected by the influence of coherent contributions in the excitation process-such as two-photon excitations (i.e. when the atoms simultaneously absorb two photons, one from each laser) and dynamical Stark effects (i.e. interactions between the laser light fields and the atoms causing rapid Rabi oscillations between atomic energy levels which give rise to broadening, splittings and shifts of transitions)-already at the rather moderate laser intensities that are obtained in unfocused pulsed laser beams today. Theoretically, it is found that the normal rate-equation approach is insufficient for describing these kind of phenomena of two-colour LEI in flames. A theory based on density-matrix formalism has been adopted for the situations encountered in LEI in flames. The equations are solved in the steady-state limit using the rotating wave approximation. The finite bandwidths of the lasers are included as phase fluctuations. There is a qualitative agreement between experiments and theory in predicting the LEI signal lineshapes since all the main features of the experiments, such as two-photon peaks, power- and saturation-broadening including splitting of peaks, are present in the theoretical simulations. The quantitative agreement is, however, unsatisfactory, and a refinement of the theory, especially in the description of the properties of the laser light and the collisional broadening and ionization mechanisms, is required for a full agreement between theory and experiments.</subfield></datafield><datafield tag="533" ind1=" " ind2=" "><subfield code="f">Elsevier Journal Backfiles on ScienceDirect 1907 - 2002</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Axner, O.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Sjostrom, S.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">in</subfield><subfield code="t">Spectrochimica Acta Part B: Atomic Spectroscopy</subfield><subfield code="d">Amsterdam : Elsevier</subfield><subfield code="g">47(1992), 2, Seite 245-273</subfield><subfield code="w">(DE-627)NLEJ185207464</subfield><subfield code="w">(DE-600)2032264-1</subfield><subfield code="x">0584-8547</subfield><subfield code="7">nnns</subfield></datafield><datafield tag="773" ind1="1" ind2="8"><subfield code="g">volume:47</subfield><subfield code="g">year:1992</subfield><subfield code="g">number:2</subfield><subfield code="g">pages:245-273</subfield></datafield><datafield tag="856" ind1="4" ind2="0"><subfield code="u">http://dx.doi.org/10.1016/0584-8547(92)80024-B</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_USEFLAG_H</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">ZDB-1-SDJ</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_NL_ARTICLE</subfield></datafield><datafield tag="951" ind1=" " ind2=" "><subfield code="a">AR</subfield></datafield><datafield tag="952" ind1=" " ind2=" "><subfield code="d">47</subfield><subfield code="j">1992</subfield><subfield code="e">2</subfield><subfield code="h">245-273</subfield></datafield></record></collection>
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