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ABSTRACT

Green and Chapman 1983

Green, S., and S. Chapman, 1983: Accuracy of the IOS approximation for highly inelastic R-T collisional energy transfer. Chem. Phys. Lett., 98, 467-471.

Rate constants for rotational excitation of CO by collisions with He atoms computed within the infinite order sudden (IOS) approximation are compared with accurate quantum (coupled-states) and classical trajectory values. Taking the IOS energy as the initial kinetic energy for upward, 0→J, transitions is found to overestimate the rates, especially for higher J (larger inelasticity). Taking the IOS energy as the initial energy for downward, J→0, transitions underestimates the rates by a comparable amount. The geometric average of IOS rates computed in these two ways is found to provide accurate values.

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