Photoionization mass spectrometric study of CH sub 3 OF

Journal Article · Sat Nov 30 23:00:00 EST 1991 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.461325· OSTI ID:5008375

Ruscic, B; Appelman, E H; Berkowitz, J ^[1]

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1. Chemistry Division, Argonne National Laboratory, Argonne, Illinois (USA)

The vacuum ultraviolet photoionization mass spectrum of CH{sub 3}OF displays a prominent parent ion peak, whose adiabatic onset is 11.340{plus minus}0.008 eV, although much lower energy fragmentation processes (CH{sub 2}O{sup +}+HF, 8.0 eV; CH{sub 2}OH{sup +}+F, 9.3 eV) are possible. These lower energy processes have very low intensity. Two higher energy processes, to CH{sup +}{sub 3}+OF and CH{sub 2}O{sup +}+H+F, are observed. Their thresholds are used to determine {Delta}{ital H}{sup 0}{sub {ital f}0} (CH{sub 3}OF){ge}{minus}23.0{plus minus}0.7 kcal/mol, or {ital D}{sub 0} (CH{sub 3}O--F){le}47.4{plus minus}1.2 kcal/mol. CH{sub 2}OF{sup +} is a significant fragment, whose appearance energy leads to {Delta}{ital H}{sup 0}{sub {ital f}0} (CH{sub 2}OF{sup +}){approx}215.1{plus minus}0.8 kcal/mol.

• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5008375
• Journal Information: Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 95:11; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ELECTROMAGNETIC RADIATION
ENERGY
ENERGY DEPENDENCE
FAR ULTRAVIOLET RADIATION
FRAGMENTATION
IONIZATION
IONIZATION POTENTIAL
MASS SPECTRA
MASS SPECTROSCOPY
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHOTOIONIZATION
RADIATIONS
SPECTRA
SPECTROSCOPY
THRESHOLD ENERGY
ULTRAVIOLET RADIATION