Laser fluorescence study of vibrational energy equilibration in CH 3F:O2 mixtures: "Impurity" molecules as probes of mode to mode energy flow pathways

J. M. Preses; G. W. Flynn; Eric Weitz

doi:10.1063/1.436876

Laser fluorescence study of vibrational energy equilibration in CH ₃F:O₂ mixtures: "Impurity" molecules as probes of mode to mode energy flow pathways

J. M. Preses^*, G. W. Flynn, Eric Weitz

^*Corresponding author for this work

Chemistry

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Abstract

The equilibration of CH₃F vibrational modes with O₂ has been studied in a CH₃F/O₂ mixture using infrared laser fluorescence techniques. Under "low level excitation" experimental conditions, all CH₃F modes are shown to come into equilibrium with oxygen at the same rate, indicating that the CH₃F modes are tightly coupled by collisions on the time scale of CH₃F/O₂ equilibration. The concept of vibrational quanta conservation is introduced and shown to be a powerful diagnostic method for mapping vibration-vibration energy transfer pathways in small molecules. A comparison is made of the observed results in CH₃F/O₂ mixtures with a previous study of CH₄/O₂.

Original language	English (US)
Pages (from-to)	2782-2787
Number of pages	6
Journal	The Journal of Chemical Physics
Volume	69
Issue number	6
DOIs	https://doi.org/10.1063/1.436876
State	Published - 1978

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General Physics and Astronomy
Physical and Theoretical Chemistry

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title = "Laser fluorescence study of vibrational energy equilibration in CH 3F:O2 mixtures: {"}Impurity{"} molecules as probes of mode to mode energy flow pathways",

abstract = "The equilibration of CH3F vibrational modes with O2 has been studied in a CH3F/O2 mixture using infrared laser fluorescence techniques. Under {"}low level excitation{"} experimental conditions, all CH3F modes are shown to come into equilibrium with oxygen at the same rate, indicating that the CH3F modes are tightly coupled by collisions on the time scale of CH3F/O2 equilibration. The concept of vibrational quanta conservation is introduced and shown to be a powerful diagnostic method for mapping vibration-vibration energy transfer pathways in small molecules. A comparison is made of the observed results in CH3F/O2 mixtures with a previous study of CH4/O2.",

author = "Preses, {J. M.} and Flynn, {G. W.} and Eric Weitz",

year = "1978",

doi = "10.1063/1.436876",

language = "English (US)",

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journal = "The Journal of Chemical Physics",

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publisher = "American Institute of Physics",

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AU - Preses, J. M.

AU - Flynn, G. W.

AU - Weitz, Eric

PY - 1978

Y1 - 1978

N2 - The equilibration of CH3F vibrational modes with O2 has been studied in a CH3F/O2 mixture using infrared laser fluorescence techniques. Under "low level excitation" experimental conditions, all CH3F modes are shown to come into equilibrium with oxygen at the same rate, indicating that the CH3F modes are tightly coupled by collisions on the time scale of CH3F/O2 equilibration. The concept of vibrational quanta conservation is introduced and shown to be a powerful diagnostic method for mapping vibration-vibration energy transfer pathways in small molecules. A comparison is made of the observed results in CH3F/O2 mixtures with a previous study of CH4/O2.

AB - The equilibration of CH3F vibrational modes with O2 has been studied in a CH3F/O2 mixture using infrared laser fluorescence techniques. Under "low level excitation" experimental conditions, all CH3F modes are shown to come into equilibrium with oxygen at the same rate, indicating that the CH3F modes are tightly coupled by collisions on the time scale of CH3F/O2 equilibration. The concept of vibrational quanta conservation is introduced and shown to be a powerful diagnostic method for mapping vibration-vibration energy transfer pathways in small molecules. A comparison is made of the observed results in CH3F/O2 mixtures with a previous study of CH4/O2.

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Laser fluorescence study of vibrational energy equilibration in CH ₃F:O₂ mixtures: "Impurity" molecules as probes of mode to mode energy flow pathways

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