Abstract
Shock-heated molecular beams have been produced in an apparatus similar in principle to that described by Skinner and Moyzis. Probes were used to measure particle velocities in shock-heated beams of argon, oxygen, and mixtures of these gases with helium. Good agreement was found between experimental and theoretical values. The velocity in a beam derived from a 5% mixture of argon with helium corresponded to an argon energy of 3.6 eV. Mass spectrometric measurements were made of the dissociation in shock-heated beams of argon mixed with either hydrogen or oxygen. Complete dissociation of hydrogen or oxygen was obtained by shock heating mixtures containing about 10% of these gases with argon. Excellent agreement between theory and experiment was found for the degree of dissociation of hydrogen, but there was substantial disagreement in the case of oxygen. It is suggested that this may be due to the variation with temperature of the dissociative ionization cross section of oxygen.
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