Accession Number:

AD0603314

Title:

A HIGH PRESSURE MASS SPECTROMETRIC STUDY OF NEOPENTANE,

Descriptive Note:

Technical rept.,

Corporate Author:

HUMBLE OIL AND REFINING CO BAYTOWN TEX

Report Date:

1964-07-01

Pagination or Media Count:

1.0

Abstract:

An A. E. I. Metropolitan-Vickers MS-2 mass spectrometer was modified to permit operation up to about 0.2 Torr, and a brief description of the modification is given. The instrument was used to investigate the ionmolecule reactions occurring at high pressures in neopentane. The extent of these reactions is appreciably smaller than those observed in the lighter alkanes. No ions with mass greater than the parent mass of neopentane me 72 are observed. From appearance potentials it is concluded that at threshold the product ions are formed from C3H5 andor C2H5. The pressure plots indicate that me 15 CH3, me 27 C2H3, and me 29 C2H5 react and me C3H3 and me 41 C3H5 react and are formed. Rate constants were obtained for the three reactant ions. Mass spectra of neopentane were obtained at low values of the ionizing voltage EV 9-14 volts. Evidence was obtained for the occurrence of several collision-induced dissociation processes, but the forms of the pressure plots for the ions produced are not understood. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE