Session DMP1 - Poster Session: Electron-Molecule Collisions.
INVITED session, Monday afternoon, October 06
Great Hall, Memorial Union
In monochloroalkanes, the peak cross sections for dissociative electron attachment declineexponentially(D. M. Pearl and P. D. Burrow, J. Chem. Phys. 101, 2940 (1994).) with increasingvertical attachment energies (VAE), that is, with the energies required to form the temporary negative ion states. The latter are observed using electron transmission spectroscopy(L. Sanche and G. J. Schulz, Phys. Rev. A 5, 1672 (1972).). In the present work, we have expanded our measurements to include a series of dichloroalkanes. We find that the same exponential dependence continues to still lower VAE, with only one significant exception thus far. Including both sets of molecules, the measured peak cross sections decline exponentially by a factor of 10^5 as the VAE increases from 1.4 eV to 3.5 eV. This behavior is attributed in part to the nearly linear increase in the widths of the resonances over this energy range.