Abstract
Circularly polarized dye laser radiation is used to prepare rotational levels j = 1 to j = 20 of the A 1Σ + u excited state of 7Li 2 with well defined values of the state multipoles K = 0, 1 and 2. Inelastic collisions with helium atoms populate other j levels and we have measured the circular polarisation ratio of emission, C, from these levels. C is plotted versus final j′ for each value of Δ j from +2 to +18 and a family of curves is obtained which may be used as a critical test of current theories. The results are interpreted in terms of cross sections σ K for transfer of the state multipoles under isotropic collision conditions. The observation of substantial polarisation following inelastic collision indicates that the σ K are dominated by certain restricted scattering channels. Relative magnitudes of the multipole cross sections are calculated using the “ l-dominant”, “restricted Δ m j channels” nd the Born approximation. These cross sections are then used to calculate C.
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