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Statetostate integral cross sections for the inelastic scattering of CH(X 2Π)+He: Rotational rainbow and orbital alignment J. Chem. Phys. 91, 821 (1989); 10.1063/1.457134Rotationally inelastic collisions of LiH with He. III. Experimental determination of statetostate cross sections State-to-state differential cross sections for rotational transitions of Na2 in collisions with He are measured in the electronic and vibrational ground state at thermal collision energies using a new laser technique. Single rotational levels Ji are labelled by modulation of their population via laser optical pumping using a dye laser. The modulation of the fluorescence induced by an Ar+ laser tuned to the level J = 28 is proportional to the cross section for collisional transfer J .. ~jf and is detected at the scatte~ng angle -3. A single optical fiber and a fiber bundle provide a flexible connection between the detector and the laser and photomultiplier, respectively. Transitions as large as ~j = 20 are observed. At small angles elastic scattering is dominant, but rotationally inelastic processes become increasingly important at larger scattering angles. Rotational rainbow structure causing a steep onset of the cross section with the scattering angle -3 (at fixed ~j) ora sharp cutoff with ~J (at fixed -3) is found. Preliminary results on rotational energy transfer in v = I indicates that vibrational motion of the molecule favors larger rotational quantum jumps.

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