Electron-impact-induced light emission from CF2Cl2

A study is presented of the optical emissions, lifetimes, emission thresholds and relative emission cross sections, in the wavelength region ( lambda =200-600 nm) for molecular fragments derived from electron impact dissociation of CCl 2 F 2 . In addition to observations for previously reported molecular fragments including CCl, CCl + , CF, etc. some others have been identified here, including CCIF(A) and CF 2 (A(0, n, O))(n=5,6). In contrast to 11-35 eV photodissociation processes, the partners in the electron dissociation of these carbenes are highly excited atoms, including atomic ions. In some cases comparisons between appearance potentials and spectroscopic transitions combined with published thermochemical data led to unique assignments of dissociation into specific channels.