THE PROBABILITY OF THE IMPACT EXCITATION OF VIBRATIONS IN DIATOMIC MOLECULES

Journal Article · Thu Aug 01 04:00:00 EDT 1963 · Izvestiya Akademii Nauk, Seriya Fizicheskaya (U.S.S.R.) For English translation see Bull. Acad. Sci. USSR, Phys. Ser. (Engl. Transl.)

OSTI ID:4164253

Generalov, N A; Losev, S A

The relaxation times of the vibration energy in a broad temperature range up to 10,000 deg K were measured by determining the distribution of the vibration-excited O behind a strong shock wave (Vestn. Mosk. Univ., III: No. 2, 52 (1962)); under the conditions used, multiquantum transitions became marked beyond 6000 to 7000 deg K. This work was continued by reviewing the- results obtained up to 7000 deg K, assuming that the excitation of the vibrations is due to single-quantum transitions. The factors considered included the nature of the bombarding particles and the effect of intermolecular forces on the probability of the impact excitation of vibrations in diatomic molecules. Experiments were carried out for measuring the time of relaxation of the vibration energy of O/sub 2/ molecules in mixtures with He, Ar, and Xe. The relaxation times measured were in the 0.2 to 4-microsecond range. The excitation probability was calculated by determining the relative effectiveness of the various atoms, M on the basis of the expression P/sub O/sub 2/M//Pc/sub O/sub 2/O/sub 2/. It was found that the Ar at om is 6 to 7 times less effective than the O/sub 2/ molecule in the 2500 to 5000 deg K range; at higher temperatures the effectiveness of Ar increased. The effectiveness of He was close to that of O/sub 2/, while Xe was quiet ineffective; the above ratio is about 1 in the first case and about 0.03 in the second. This behavior is attributed to the difference of the atomic masses of Ar, He, and Xe. (TTT)

• Research Organization: Moscow State Univ.
• NSA Number: NSA-18-000770
• OSTI ID: 4164253
• Journal Information: Izvestiya Akademii Nauk, Seriya Fizicheskaya (U.S.S.R.) For English translation see Bull. Acad. Sci. USSR, Phys. Ser. (Engl. Transl.), Journal Name: Izvestiya Akademii Nauk, Seriya Fizicheskaya (U.S.S.R.) For English translation see Bull. Acad. Sci. USSR, Phys. Ser. (Engl. Transl.) Vol. Vol: 27; ISSN IANFA
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

ARGON
ATOMS
DIFFUSION LENGTH
ENERGY
EXCITATION
HELIUM
HIGH TEMPERATURE
IRRADIATION
MASS
MEASURED VALUES
MIXING
MOLECULES
OXYGEN
PHYSICS
QUANTUM MECHANICS
RELAXATION
SHOCK WAVES
TRANSIENTS
VIBRATIONS
XENON