Accession Number : AD0277010

Title :   CHEMICAL REACTIONS USING MODULATED FREE RADICAL BEAMS, PART A. THE VAPOR PRESSURE OF SOLID HYDROGEN IN THE TEMPERATURE RANGE FROM 4.7 K TO 1

Corporate Author : GENERAL DYNAMICS SAN DIEGO CALIF GENERAL ATOMIC DIV

Report Date : 28 FEB 1962

Pagination or Media Count : 1

Abstract : Modulated, crossed molecular beams were employed to study the chemical kinetics of several freeradical reactions. For the hydrogen-isotope exchange (H + D2 yields HD + D) signals were detected which correspond to a reaction crosssection of approximately 10 to the -19th power sq cm. Elastic scattering complicates the interpretation. The promises, methods, and difficulties of the crossed-beam technique are discussed. Measurements were made of the vapor pressure of solid H, of a nominal 75% orthohydrogen composition, from 4.7 to 11.1 K. The results were fitted to Kirchoff's equation. A suitable expression for the vapor pressure was found to be log P(mm) equals -43.39/T + 5/2 log T(K) plus 2.047 from 4.7 to 13.95 K. (Author)

Descriptors :   *FREE RADICALS, *HYDROGEN, *MOLECULAR BEAMS, CHEMICAL PROPERTIES, CRYOGENICS, ELASTIC SCATTERING, ISOTOPES, MASS SPECTROSCOPY, MODULATION, PHYSICAL PROPERTIES, REACTION KINETICS, SOLIDS, SPECTRUM ANALYZERS, VAPOR PRESSURE

Distribution Statement : APPROVED FOR PUBLIC RELEASE