Date of Award


Degree Type


Degree Name





Physics, Atomic.




This work presents emission cross section following electron-impact on helium, hydrogen, sulfur hexafluoride, nitrogen, and argon. Specifically, we studied the following emissions. The He('+) 2p (--->) 1s 30.4 nm emission, the numerous emissions from the neutral and singly ionized atomic fragments of SF(,6), the 120 nm emission from N(,2), and the Lyman series emissions from both atomic and molecular hydrogen. The most important aspect of the hydrogen work was the determination of the H(,2) Lyman alpha emission cross section. Use of the Lyman series from atomic hydrogen for the calibration of optical equipment in the 90 to 122 nm region was also investigated. To illustrate the technique, emission cross sections of the argon resonance lines near 105 nm and the argon ion lines near 93 nm were determined. Excitation functions for the He('+) 30.4 nm emission and for various fluorine and sulfur emissions (along with some appearance potentials) were also obtained. A value of (7.5 (+OR-) 1.6) x 10('-19) cm('2) at 200 eV is found for the He('+) 30.4 nm transition. For the dissociative excitation of SF(,6) the largest emission cross sections belonged to the FI transitions at 95.5 nm (2.03 x 10('-18) cm('2) at 200 eV) and 97.5 nm (1.46 x 10('-18 )cm('2) at 200 eV). The maximum SI and SII emission cross sections are approximately 1 x 10('-19) cm('2) and the strongest FII emission cross sections are approximately 1 x 10('-20) cm('2). The NI 120 nm emission cross section is (2.98 (+OR-) 0.36) x 10('-18) cm('2). Our value for the H(,2) Lyman alpha emission cross section is (7.08 (+OR-) 0.58) x 10('-18) cm('2) at 100 eV. The emission cross sections for the argon resonance lines at 104.8 nm and 106.7 nm are (12.8 (+OR-) 1.3) x 10('-18) cm('2) and (5.5 (+OR-) 0.8) x 10('-18) cm('2) respectively. For the argon ion lines at 92 nm and 93.5 nm they are (5.6 (+OR-) 0.5) x 10('-18) cm('2) and (2.3 (+OR-) 0.2) x 10('-18) cm('2) respectively.Dept. of Physics. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1986 .F673. Source: Dissertation Abstracts International, Volume: 47-09, Section: B, page: 3816. Thesis (Ph.D.)--University of Windsor (Canada), 1986.