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Rotational Energy Transfer in Molecular Collisions and Parameters of Power-Gap "Law"

100%

Agrawal P., Tilwankar S.

Acta Physica Polonica A

1998

vol. 93

issue 3

451-458

The quantum mechanical integral inelastic cross-sections for the rotation transitions in a diatomic molecule with an atom were computed and analysed by using the empirical power-gap "law" over a wide range of collision energy. A well-known parameter, |ΔE|^{*}, of the power-gap "law" was estimated by observing a rapid fall of cross-sections for the rotational energy transfer, |ΔE| ≥ |ΔE|^{*}. It was found that |ΔE|^{*} corresponds to classical limit of maximum amount of rotational energy transfer permissible by the angular momentum conservation constraints and the hard ellipsoid potential model provided the hard ellipsoid potential surface is represented by the classical turning point surface of the real potential employed in the computation of cross-sections. Such an agreement is shown to be useful in the determination of the difference of major and minor axes of the intermolecular-potential ellipsoid from the knowledge of the cross-sections and the power-gap "law".

Potential Parameters and Energy Dependence of Rotational Energy Transfer in Molecular Systems

81%

Agrawal P., Garg V., Patidar K.

Acta Physica Polonica A

1993

vol. 84

issue 2

247-252

The cross-sections for rotational transitions in a diatomic molecule due to collision with an atom were computed. An empirical relation is obtained that gives the dependence of cross-sections on the energy of the colliding system and the parameters of the interaction potential energy surface. The results are interpreted to investigate the mechanism of the rotational energy transfer process. The cross-sections are found to depend linearly on the torque, range of the potential, and the collision time. Depending on the variation in the location of classical turning point with change in energy, the cross-sections may increase or decrease with energy or cross-section versus energy curve may exhibit maxima or minima.

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2 Acta Physica Polonica A

1 1998

1 1993

2 Agrawal P.

1 Garg V.

1 Patidar K.

1 Tilwankar S.

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Rotational Energy Transfer in Molecular Collisions and Parameters of Power-Gap "Law"

Potential Parameters and Energy Dependence of Rotational Energy Transfer in Molecular Systems