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Electron ionization study of ammonia micro‐clusters
Author(s) -
Pełc Andrzej,
Michalak Leszek
Publication year - 2000
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/1097-0231(20000830)14:16<1455::aid-rcm47>3.0.co;2-0
Subject(s) - chemistry , electron ionization , ammonia , adiabatic process , ion , ionization , mass spectrometry , field desorption , range (aeronautics) , atomic physics , jet (fluid) , ion source , ammonia production , electron , analytical chemistry (journal) , nuclear physics , thermodynamics , organic chemistry , chromatography , materials science , composite material , physics
An electron impact ion source on a double focusing sector field mass spectrometer was used to investigate ammonia micro‐clusters produced by the adiabatic free jet expansion of ammonia gas. The appearance energies for [NH 3 ] n + , n ≤ 9, ions have been determined. Results of measurements of appearance pressures of selected clusters are described for a range of operating conditions. An empirical formula describing the ammonia clusters production is proposed.Copyright © 2000 John Wiley & Sons, Ltd.