Librational relaxation of molecular impurities in host crystals

R. B. Gerber; M. Berkowitz; V. Yakhot

doi:10.1080/00268977800101621

Librational relaxation of molecular impurities in host crystals

R. B. Gerber, M. Berkowitz, V. Yakhot

Institute of Chemistry

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Abstract

A study is made of phonon-assisted transitions between closely spaced librational levels of an impurity molecule in a host crystal. The contributions to librational relaxation of direct, of Orbach-type and of Raman processes are evaluated as a function of temperature. It is found for a model case of NH(3^π) in solid Ar, that below T= 16 K, the direct process dominates, while for T>20 K relaxation takes place mainly by the Raman mechanisms. The calculation predicts a nanosecond time scale for the relaxation at 4 K, and a picosecond time-scale for the relaxation at T= 24 K.

Original language	English
Pages (from-to)	355-363
Number of pages	9
Journal	Molecular Physics
Volume	36
Issue number	2
DOIs	https://doi.org/10.1080/00268977800101621
State	Published - Aug 1978

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abstract = "A study is made of phonon-assisted transitions between closely spaced librational levels of an impurity molecule in a host crystal. The contributions to librational relaxation of direct, of Orbach-type and of Raman processes are evaluated as a function of temperature. It is found for a model case of NH(3π) in solid Ar, that below T= 16 K, the direct process dominates, while for T>20 K relaxation takes place mainly by the Raman mechanisms. The calculation predicts a nanosecond time scale for the relaxation at 4 K, and a picosecond time-scale for the relaxation at T= 24 K.",

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N2 - A study is made of phonon-assisted transitions between closely spaced librational levels of an impurity molecule in a host crystal. The contributions to librational relaxation of direct, of Orbach-type and of Raman processes are evaluated as a function of temperature. It is found for a model case of NH(3π) in solid Ar, that below T= 16 K, the direct process dominates, while for T>20 K relaxation takes place mainly by the Raman mechanisms. The calculation predicts a nanosecond time scale for the relaxation at 4 K, and a picosecond time-scale for the relaxation at T= 24 K.

AB - A study is made of phonon-assisted transitions between closely spaced librational levels of an impurity molecule in a host crystal. The contributions to librational relaxation of direct, of Orbach-type and of Raman processes are evaluated as a function of temperature. It is found for a model case of NH(3π) in solid Ar, that below T= 16 K, the direct process dominates, while for T>20 K relaxation takes place mainly by the Raman mechanisms. The calculation predicts a nanosecond time scale for the relaxation at 4 K, and a picosecond time-scale for the relaxation at T= 24 K.

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Librational relaxation of molecular impurities in host crystals

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