Abstract
The author presents the results of close-coupling calculations of cross sections for vibrational excitation of ortho-H2 by He at a collision energy midway between the first and second excited vibrational excitation thresholds. The results complement those for the excitation of para-H2 by He of Flower and Kirkpatrick (1982). A comparison is made with the predictions of two energy sudden factorisation schemes and the author's own infinite-order sudden calculations. The efficiency of employing an approximate potential algorithm to solve the IOS equations, coupled in vibration, is also discussed.
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