Energy transfer reactions in electron beam excited mixtures of xenon and argon gases
Bonnifield, Thomas Dyer
Walters, G. King
Master of Arts
The time dependence of the vacuum ultraviolet emissions from mixtures of xenon and argon gases is measured following excitation by a low intensity electron beam. The xenon concentration is varied from 8.4 x 113 cm-3 to 2.76 x 1 cm while the argon density is varied between 5.1 x 1 cm and 2.9 x 1 cm . The second molecular continuum of argon is observed to be quenched in electronic excitation transfer to xenon atoms forming the xenon state with a rate constant of (4.39 - .5) x 1 cm /sec. At the higher xenon concentrations the second molecular continuum of xenon is formed by destruction of xenon atoms in collisions with a ground state xenon atom and a ground state argon atom at the rate of (2.15 -+. 25)-x312 cm /sec. The first molecular continuum of xenon is observed to be collision induced radiation from the xenon P level as well as radiation from high vibrational levels of the Ou molecule of xenon. The collision induced radiation rate constant is found to be (3.2-.7) x 1 cm/sec. The rate of formation of xenon molecules radiating in the first continuum is (2.1+- .2) x 1-31c m6 /sec. Collisional de-excitation of the xenon P^ level occurs with a rate constant of (1.5 +- . 3)-x114 c3m /sec.