Institute of Space and Aeronautical Science,University of Tokyo
雑誌名
ISAS report/Institute of Space and Aeronautical Science,University of Tokyo
巻
36
号
12
ページ
327 - 341
発行年
1971-10
抄録（英）
The rotational transitions in molecular collisions in the para-hydrogen gas are theoretically studied in the distorted-wave approximation. In the long-range part of the intermolecular force, the orientation-dependence of the dipole-dipole dispersion force and the quadrupole-quadrupole interaction are fully taken into account. In the short-range part of the interaction, the anisotropy parameter is determined empirically in such a way as the calculated rate constants explain the ultrasonic absorption data at 90°K. It is shown that our rotational cross sections can explain satisfactorily the ultrasonic absorption experiment at 90° and 293°K, but the agreement with the ultrasonic dispersion experiment is less satisfactory. The orientation-dependence of the long-range interactions and the simultaneous transitions in two colliding molecules are both found important. Furthermore, it is found that the cross sections are large when the collision partner is in an excited state of rotation.
Rotational Transitions in Para-Hydrogen by Molecular Collisions
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