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The collisional energy transfer probability P(AE) of polyatomic molecules in the gas phase is calculated for the strong-collision case. From it the average energy transferred per collision {AE) is evaluated. It is found that for the equilibrium systems which were investigated P(AE) is symmetric and it has a Gaussian form for a large colliding pair. As the temperature increases, {AE) increases as well. The value oí {AE) increases up to a limiting value as the reduced number of normal modes, s" increases. An analytical expression for P(AE) and {AE) is given for large polyatomic molecules with classical density of states.

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