Energy transfer reactions in electron beam excited mixtures of xenon and argon gases

[摘要] 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.

[发布机构] Rice University