Photoionization mass spectrometric study of CH sub 3 OF

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 ene...

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Bibliographic Details
Published in:The Journal of chemical physics 1991-12, Vol.95:11
Main Authors: Ruscic, B., Appelman, E.H., Berkowitz, J.
Format: Article
Language:English
Subjects:
640302 - Atomic, Molecular & Chemical Physics- Atomic & Molecular Properties & Theory
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
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Summary: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.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.461325