β Scribed by Paul Brumer
No coin nor oath required. For personal study only.
Cross sections fOi rotational excitation'are calculated classically for coilisions ofH with CO and of He with HCN. The H+-CO cross sections are in good agreement with quantum results but the He+HCN results are not. Tix failure of the classical method, when applied to He+HCN, is attributed to the neglect of interference effects zrising from near symmetry properties of the potential. Two modified classical trajectory methods which partially correct for near symmetry effects a&discussed.
Differences between the classical and Method I or Method 2 results are symptomatic of such behavior.
π SIMILAR VOLUMES
If the collisional ionization is chiefly due to energy transfer from the polar-molcculc rotation to an electron in a high Rydberg state of the atom, then theory predicts that the cross section averaged over a thermal distribution of rotational states should show step-like structure as a function of
Classical tujectory calculations for a model of 12 scattering from a surface show that in hi~h-xtergy collisions the amount of translational energy trancferred to rotation geatlv exceeds the amount transferred to vibration\_ The sudden approximation is used to qualitative& interpret the results.
Associative ionizing molecule-atom collisions Na\*( A 'Cc ) +Na( 3p) -+Na: + e have been observed at simultaneous excitation of dimers and atoms by means of two lasers. Measurements of the relevant ionization current show that the cross section of molecule-atom ionizing collisions exceeds by an orde