Low-temperature SIMS mass spectra of diethyl ether

Kosevich, M. V. and Shelkovsky, V. S. and Boryak, O. A. and Gömöry, Ágnes and Végh, P. D. and Vékey, Károly (2003) Low-temperature SIMS mass spectra of diethyl ether. JOURNAL OF MASS SPECTROMETRY, 38 (5). pp. 517-522. ISSN 1076-5174

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Abstract

For the first time a secondary ion mass spectrum of diethyl ether was obtained at low temperature. The spectrum recording became possible by carefully selecting the range of experimental conditions for the production of a cluster-type spectrum. This range is specified by the threshold for spectrum appearance above the melting temperature of the frozen sample and a fairly short time span of existence of the liquid estimated as only a few minutes. The latter necessitates rather rapid spectrum detection. In practice, about 1 min was available for recording of the cluster-type spectra. The secondary emission mass spectrum of diethyl ether appeared to be rich in peaks: along with abundant protonated clusters M-n . H+ (n = 1-12), unusually intense [M-n-H](+) and weaker M-n(+.) peaks were present accompanied by several sets of fragmented clusters, [M-n-15](+), [M-n-29](+), [M-n-27](+), [M-n- 45](+), and monohydrates, M-n . H2O . H+. The analysis of all the peaks showed that the pattern of fragment clusters is qualitatively similar to the pattern of fragmentation of the diethyl ether molecular ion under high-energy electron impact. The general features of the behaviour of diethyl ether under low-temperature mass spectrometric conditions were similar to those observed earlier for some other organic solvents.

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