Metastable peaks in chemical ionization mass spectrometry: Unimolecular decomposition of protonated methanol ions

Metastable peaks have been observed from the unimolecular decomposition of an excited intermediate ion formed by ion-molecule reaction in a high-pressure chemical ionization source. Chemical ionization of methanol with H 3 + was used to produce excited protonated methanol ions, m/e = 33, for which m...

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Bibliographic Details
Published in:International journal of mass spectrometry and ion physics 1977-01, Vol.24 (1), p.25-35
Main Authors: Huntress, Wesley T., Sen Sharma, Dilip K., Jennings, Keith R., Bowers, Michael T.
Format: Article
Language:English
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Summary:Metastable peaks have been observed from the unimolecular decomposition of an excited intermediate ion formed by ion-molecule reaction in a high-pressure chemical ionization source. Chemical ionization of methanol with H 3 + was used to produce excited protonated methanol ions, m/e = 33, for which metastables were observed for decomposition to protonated formaldehyde ( m/e = 31) and methyl cations ( m/e = 15): ▪ The metastable peak for 33 → 31 is broad and Xshed-topped, and yields a kinetic-energy release of 0.93 eV. The shape of the metastable for 33 → 15 is Gaussian and narrow, corresponding to an energy release of only 0.002 eV.
ISSN:0020-7381
1873-3034
DOI:10.1016/0020-7381(77)83003-9