VUV spectroscopic investigations of electron collisions with ground state and metastable targets.

A detailed description of a calibration technique is given in which emissions from H and $H\sb2$ are used to calibrate the optical apparatus used for electron impact emission cross section measurements in the wavelength range 90-130 nm. Absolute emission cross sections for the KrII 96.5 nm and KrII 91.7 nm have been established to be 3.4 $\times$ 10$\sp{-18}cm\sp2$ and 2.8 $\times$ 10$\sp{-18}cm\sp2$ respectively at 200 eV. The cross section ratio of these two lines has been determined to be constant over the energy range 100-300 eV. Dissociative excitation and fragmentation of $CF\sb3H$ following electron impact have been studied over the energy range up to 600 eV by monitoring the VUV radiation in the wavelength region 50-130 nm produced from excited fragments. Emission cross sections for production of individual features have been established. R.F.discharge-produced metastable $N\sbsp{2}{*}$ target has been used in collisions with electrons. Intensity change patterns of the LBH band system and the Carroll-Yoshino band system indicate that more than 20% of the $N\sb2$ molecules in the discharge have been promoted from the normal $\nu$ = 0 ground vibrational level. The absolute emission cross sections for atomic oxygen resonance lines at 130.3 nm, 98.9 nm, 87.8 nm and 102.7 nm following electron impact on atomic oxygen have been established up to 100 eV. About 70% of NO molecules are dissociated by an r.f-discharge source to provide a high concentration of atomic oxygen in the target beam. Extreme care has been taken to measure the trapping reduction in the emission rate for these resonance lines. Present results are able to remove some discrepancies in previous measurements, and provide cross section data with a much higher level of reliability.Dept. of Physics. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1991 .W344. Source: Dissertation Abstracts International, Volume: 53-01, Section: B, page: 0353. Chairman: J. W. McConkey. Thesis (Ph.D.)--University of Windsor (Canada), 1991