Overtone, 2NH (ν1+ν3) spectroscopy of NH3-Ar and NH3-Kr
We have recorded between 6561 and 6671 cm - 1 the spectrum of jet-cooled ammonia seeded in Ne, Ar and Kr, using continuous wave cavity ring-down spectroscopy (CW-CRDS). The equivalent absorption pathlength was around 750 m. Three bands are assigned to Π(1 1 )←Σ(0 0 ), Π(1 1 )←Π(1 0 ) and Δ(?)←Π(1 0...
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Published in | Molecular physics Vol. 113; no. 24; pp. 3934 - 3945 |
---|---|
Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Abingdon
Taylor & Francis
17.12.2015
Taylor & Francis Ltd |
Subjects | |
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Abstract | We have recorded between 6561 and 6671 cm
-
1
the spectrum of jet-cooled ammonia seeded in Ne, Ar and Kr, using continuous wave cavity ring-down spectroscopy (CW-CRDS). The equivalent absorption pathlength was around 750 m. Three bands are assigned to Π(1
1
)←Σ(0
0
), Π(1
1
)←Π(1
0
) and Δ(?)←Π(1
0
) in the 2NH, ν
1
+ν
3
←GS transition of the ortho NH
3
-Ar dimer. They are rotationally analysed and a simultaneous fitting procedure, together with one far-infrared ground state band from the literature is successfully achieved. A possible M
j
-dependent cooling process is reported. Only the first of these bands is observed in the ortho NH
3
-Kr dimer, and rotationally analysed. Individual line perturbations and anomalous line broadening effects are reported. A J-dependent vibrational predissociation lifetime with a mean value around 0.6 ns is obtained for the Π(1
1
) sub-state in NH
3
-Ar and NH
3
-Kr. Two additional bands are assigned to NH
3
-Ar involving close Π upper sub-states. A group of close bands from the para dimer is identified in NH
3
-Ar. The energy of all observed ortho and para sub-states is extracted from the analysis. Finally, more bands are reported but their carriers could not be identified. |
---|---|
AbstractList | We have recorded between 6561 and 6671 cm-1 the spectrum of jet-cooled ammonia seeded in Ne, Ar and Kr, using continuous wave cavity ring-down spectroscopy (CW-CRDS). The equivalent absorption pathlength was around 750 m. Three bands are assigned to Π(11)[left arrow]Σ(00), Π(11)[left arrow]Π(10) and [Delta](?)[left arrow]Π(10) in the 2NH, ν1+ν3[left arrow]GS transition of the ortho NH3-Ar dimer. They are rotationally analysed and a simultaneous fitting procedure, together with one far-infrared ground state band from the literature is successfully achieved. A possible Mj-dependent cooling process is reported. Only the first of these bands is observed in the ortho NH3-Kr dimer, and rotationally analysed. Individual line perturbations and anomalous line broadening effects are reported. A J-dependent vibrational predissociation lifetime with a mean value around 0.6 ns is obtained for the Π(11) sub-state in NH3-Ar and NH3-Kr. Two additional bands are assigned to NH3-Ar involving close Π upper sub-states. A group of close bands from the para dimer is identified in NH3-Ar. The energy of all observed ortho and para sub-states is extracted from the analysis. Finally, more bands are reported but their carriers could not be identified. We have recorded between 6561 and 6671 cm - 1 the spectrum of jet-cooled ammonia seeded in Ne, Ar and Kr, using continuous wave cavity ring-down spectroscopy (CW-CRDS). The equivalent absorption pathlength was around 750 m. Three bands are assigned to Π(1 1 )←Σ(0 0 ), Π(1 1 )←Π(1 0 ) and Δ(?)←Π(1 0 ) in the 2NH, ν 1 +ν 3 ←GS transition of the ortho NH 3 -Ar dimer. They are rotationally analysed and a simultaneous fitting procedure, together with one far-infrared ground state band from the literature is successfully achieved. A possible M j -dependent cooling process is reported. Only the first of these bands is observed in the ortho NH 3 -Kr dimer, and rotationally analysed. Individual line perturbations and anomalous line broadening effects are reported. A J-dependent vibrational predissociation lifetime with a mean value around 0.6 ns is obtained for the Π(1 1 ) sub-state in NH 3 -Ar and NH 3 -Kr. Two additional bands are assigned to NH 3 -Ar involving close Π upper sub-states. A group of close bands from the para dimer is identified in NH 3 -Ar. The energy of all observed ortho and para sub-states is extracted from the analysis. Finally, more bands are reported but their carriers could not be identified. |
Author | Vanfleteren, T. Liévin, J. Földes, T. Herman, M. |
Author_xml | – sequence: 1 givenname: T. surname: Vanfleteren fullname: Vanfleteren, T. organization: Laboratoire de Chimie quantique et Photophysique, CP160/09, Faculté des Sciences, Université Libre de Bruxelles – sequence: 2 givenname: T. surname: Földes fullname: Földes, T. organization: Laboratoire de Chimie quantique et Photophysique, CP160/09, Faculté des Sciences, Université Libre de Bruxelles – sequence: 3 givenname: J. surname: Liévin fullname: Liévin, J. organization: Laboratoire de Chimie quantique et Photophysique, CP160/09, Faculté des Sciences, Université Libre de Bruxelles – sequence: 4 givenname: M. surname: Herman fullname: Herman, M. email: mherman@ulb.ac.be organization: Laboratoire de Chimie quantique et Photophysique, CP160/09, Faculté des Sciences, Université Libre de Bruxelles |
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Snippet | We have recorded between 6561 and 6671 cm
-
1
the spectrum of jet-cooled ammonia seeded in Ne, Ar and Kr, using continuous wave cavity ring-down spectroscopy... We have recorded between 6561 and 6671 cm-1 the spectrum of jet-cooled ammonia seeded in Ne, Ar and Kr, using continuous wave cavity ring-down spectroscopy... |
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SourceType | Aggregation Database Publisher |
StartPage | 3934 |
SubjectTerms | ammonia CW-CRDS lifetime molecular complex overtone spectroscopy Spectrum analysis |
Title | Overtone, 2NH (ν1+ν3) spectroscopy of NH3-Ar and NH3-Kr |
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