title: Low-temperature SIMS mass spectra of diethyl ether.
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).H(2)O.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.
authors.affiliation: B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine. mvkosevich@ilt.kharkov.ua
authors.forename: Marina V
authors.initials: MV
authors.lastname: Kosevich
authors.forename: Vadim S
authors.initials: VS
authors.lastname: Shelkovsky
authors.forename: Oleg A
authors.initials: OA
authors.lastname: Boryak
authors.forename: Agnes
authors.initials: A
authors.lastname: Gömöry
authors.forename: Peter D
authors.initials: PD
authors.lastname: Végh
authors.forename: Károly
authors.initials: K
authors.lastname: Vékey