Rotational relaxation in ground-state p-difluorobenzene: State selection by stimulated emission pumping

Warren D. Lawrence; Alan E.W. Knight

doi:10.1021/j100226a006

Rotational relaxation in ground-state p-difluorobenzene: State selection by stimulated emission pumping

Warren D. Lawrence, Alan E.W. Knight

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Abstract

An estimate is obtained for the cross section for rotational relaxation from a small subset of |J,K〉 states in the 5₂30₂ vibrational level of S₀ p-difluorobenzene. The method of stimulated emission pumping (SEP) is used to prepare the initial |v,J,K〉 population. Collisional relaxation induced by the bath of p-difluorobenzene molecules in Boltzmann equilibrium is monitored from the intensity of wavelength-resolved single vibronic level fluorescence generated via selective excitation from the SEP-prepared levels. The average efficiency for rotational relaxation σ/σ_HS, relative to the hard-sphere cross section σ_HS, is found to be 5 ± 2 for ground-state p-difluorobenzene. This study demonstrates that rotational relaxation in a nonpolar polyatomic molecule in its S₀ state is as efficient as that found for similar polyatomics in their S₁ electronic states.

Original language	English
Pages (from-to)	389-391
Number of pages	3
Journal	Journal of Physical Chemistry
Volume	87
Issue number	3
DOIs	https://doi.org/10.1021/j100226a006
Publication status	Published - 1 Feb 1983
Externally published	Yes

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title = "Rotational relaxation in ground-state p-difluorobenzene: State selection by stimulated emission pumping",

abstract = "An estimate is obtained for the cross section for rotational relaxation from a small subset of |J,K〉 states in the 52302 vibrational level of S0 p-difluorobenzene. The method of stimulated emission pumping (SEP) is used to prepare the initial |v,J,K〉 population. Collisional relaxation induced by the bath of p-difluorobenzene molecules in Boltzmann equilibrium is monitored from the intensity of wavelength-resolved single vibronic level fluorescence generated via selective excitation from the SEP-prepared levels. The average efficiency for rotational relaxation σ/σHS, relative to the hard-sphere cross section σHS, is found to be 5 ± 2 for ground-state p-difluorobenzene. This study demonstrates that rotational relaxation in a nonpolar polyatomic molecule in its S0 state is as efficient as that found for similar polyatomics in their S1 electronic states.",

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year = "1983",

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doi = "10.1021/j100226a006",

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T1 - Rotational relaxation in ground-state p-difluorobenzene

T2 - State selection by stimulated emission pumping

AU - Lawrence, Warren D.

AU - Knight, Alan E.W.

PY - 1983/2/1

Y1 - 1983/2/1

N2 - An estimate is obtained for the cross section for rotational relaxation from a small subset of |J,K〉 states in the 52302 vibrational level of S0 p-difluorobenzene. The method of stimulated emission pumping (SEP) is used to prepare the initial |v,J,K〉 population. Collisional relaxation induced by the bath of p-difluorobenzene molecules in Boltzmann equilibrium is monitored from the intensity of wavelength-resolved single vibronic level fluorescence generated via selective excitation from the SEP-prepared levels. The average efficiency for rotational relaxation σ/σHS, relative to the hard-sphere cross section σHS, is found to be 5 ± 2 for ground-state p-difluorobenzene. This study demonstrates that rotational relaxation in a nonpolar polyatomic molecule in its S0 state is as efficient as that found for similar polyatomics in their S1 electronic states.

AB - An estimate is obtained for the cross section for rotational relaxation from a small subset of |J,K〉 states in the 52302 vibrational level of S0 p-difluorobenzene. The method of stimulated emission pumping (SEP) is used to prepare the initial |v,J,K〉 population. Collisional relaxation induced by the bath of p-difluorobenzene molecules in Boltzmann equilibrium is monitored from the intensity of wavelength-resolved single vibronic level fluorescence generated via selective excitation from the SEP-prepared levels. The average efficiency for rotational relaxation σ/σHS, relative to the hard-sphere cross section σHS, is found to be 5 ± 2 for ground-state p-difluorobenzene. This study demonstrates that rotational relaxation in a nonpolar polyatomic molecule in its S0 state is as efficient as that found for similar polyatomics in their S1 electronic states.

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SP - 389

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JO - Journal of Physical Chemistry

JF - Journal of Physical Chemistry

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ER -

Rotational relaxation in ground-state p-difluorobenzene: State selection by stimulated emission pumping

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