ELASTIC-SCATTERING AND SOME VIBRATIONAL-EXCITATION CROSS-SECTIONS FORELECTRON COLLISIONS WITH SI2H6

Absolute elastic cross sections for e-disilane collisions have been me asured by using incident kinetic energies of 2, 3, 4, 5, 7.5, 10, 15, 20, 40, and 100 eV and recorded over a scattering angular range of 10- 130-degrees. These cross sections have been integrated by employing a nonlinear phase shift fitting procedure to generate a list of integral elastic and momentum transfer cross sections for the same energy rang e. The angular distributions have been found to agree reasonably well with a continuum multiple scattering calculation using only local pote ntials and also with a multichannel Schwinger variational calculation. Limited experiments on vibrationally inelastic scattering reveal the existence of a shape resonance with a peak at approximately 2 eV that is characteristic of trapping by a valence orbital with Si-H antibondi ng character analogous to that encountered in e-monosilane scattering.