Photoelectron and far-ultraviolet absorption spectra of chlorofluoro derivatives of ethane

Abstract

The Hei photoelectron and vacuum ultraviolet absorption spectra of the following chlorofluoro derivatives of ethane have been measured: C2F5Cl, CH3CF2Cl, CF2Cl−Cf2Cl, CF2Cl−CFHCL, and CF2CL−CFCl2. The lowest ionization potentials (12−13 eV) and all absorption bands from 50 000−84 000 cm−1 are due to transitions from the chlorine lone pair orbitals (Cl). The I.P.’s between 14 and 16 eV are due to ionization from orbitals mainly populated in the C−Cl, C−C, and C−H bonds, while at higher energies, ionization from orbitals of F lone pair (F) and C−F bonding character takes place. The lowest electronic transition is of the valence−shell type; at higher frequencies, Rydberg bands are found due to 4s→Cl and 4p→Cl type transitions.