L ? emission from collisional excitation of H Atoms by threshold energy Ar+ ions

Abstract

In a specially designed collision chamber, H atoms produced by a microwave discharge were excited into the 2p state by impact of Ar + ions in a beam. A degree of dissociation up to t/= 94 % was measured at the exit of the microwave source, although in the center of the collision cell ~ is smaller, with a lower limit of 33 %. The effect of vibrational excitation of H 2 by the discharge and the resulting difficulties of measuring t/ are discussed. The cross section for L= emission increases linearly from the threshold, at 10.2 eVcM, to 17.1 eVcM. The absolute cross section at this energy is 1.5.10 -17 cm 2 for r/=33% (with a minimum of 0.6.10-17 cm 2, for the maximum possible t/). The absence of an activation barrier rules out some features shown by an earlier ab initio calculation.

Hydrogen addition to an argon glow discharge: a numerical simulation

“…14,15 A number of papers have also reported the measurement of ion energy distributions in argon-hydrogen discharges. [16][17][18] Finally, a vast number of chemical reactions between argon and hydrogen species has been studied for conditions typically used in discharge plasmas, [19][20][21][22][23][24][25][26][27][28][29][30][31][32] providing useful information, such as cross sections and rate coefficients, for numerical investigations of argon-hydrogen discharges.…”