title: Low energy electron energy-loss spectroscopy of CF3X (X=Cl,Br).
abstract: We report threshold electron energy-loss spectra for the fluorohalomethanes CF3X (X=Cl,Br). Measurements were made at incident electron energies of 30 and 100 eV in energy-loss range of 4-14 eV, and at scattering angles of 4 degrees and 15 degrees. Several new electronic transitions are observed which are ascribable to excitation of low-lying states as well as are intrinsically overlapped in the molecules themselves. Assignments of these electronic transitions are suggested. These assignments are based on present spectroscopic and cross-section measurements, high-energy scattering spectra, and ab initio molecular orbital calculations. The calculated potential curves along the C-X bond show repulsive nature, suggesting that these transitions may lead to dissociation of the C-X bond. The present results are also compared with the previous ones for CF3H, CF4, and CF3I.
authors.affiliation: Department of Physics, Sophia University, Tokyo 102-8554, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Hoshino
authors.forename: K
authors.initials: K
authors.lastname: Sunohara
authors.forename: C
authors.initials: C
authors.lastname: Makochekanwa
authors.forename: L
authors.initials: L
authors.lastname: Pichl
authors.forename: H
authors.initials: H
authors.lastname: Cho
authors.forename: H
authors.initials: H
authors.lastname: Tanaka