## Abstract The fragmentation behaviour of a series of six avermectins and two of their derivatives has been studied in the negativeโion mode in the presence of ammonia. In contrast with positiveโion mass spectra the negativeโion spectra show abundant ions in the high mass region. Molecular mass de
The negative ion mass spectra of methanol and deuterated methanol
โ Scribed by J. C. J. Thynne
- Publisher
- John Wiley and Sons
- Year
- 1973
- Tongue
- English
- Weight
- 176 KB
- Volume
- 7
- Category
- Article
- ISSN
- 1076-5174
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โฆ Synopsis
Abstract
The negative ion mass spectra of methanol, methanolโd and trideuteromethanol have been measured at 70 eV. Use of deuterated methanols has enabled the ion at m/e 31 to be identified as CH~3~O^โ^ and not CH~2~OH^โ^. Isotope effects have been determined for H^โ^ and D^โ^ formation, and for OH^โ^ and OD^โ^ formation. It has been shown that OH^โ^ formation occurs as a rearrangement reaction as well as by simple C๏ฃฟO bond fission.
๐ SIMILAR VOLUMES
Positively and negatively charged cluster ions were produced from methanol and ethanol samples under low temperature secondary ion mass spectrometric conditions. Neat alcohol clusters [M n . H + ], [M n -H] -and mixed alcohol-water cluster sets [M n . (H 2 O) m . H + ] and [M n . (H 2 O) m -H] -sets