Cluster ion formation in thermospray mass spectrometry of ammonium salts

Cluster ion formation in thermospray ionization of ammonium salts with water as solvent is investigated and used to probe the state of the gas mixture at the end of the capillary vaporizer and effects of the gas expansion into the jet chamber. Experiments with ammonium nitrate reveal the formation o...

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Bibliographic Details
Published inInternational journal of mass spectrometry and ion processes Vol. 128; no. 3; pp. 123 - 132
Main Authors Nehring, H., Thiebes, S., Bütfering, L., Röllgen, F.W.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 29.10.1993
Elsevier
Subjects
Ammonium salts
Chemistry
Cluster ions
Exact sciences and technology
Inorganic chemistry and origins of life
Kinetics and mechanism of reactions
Thermospray ionization
Thermospray ionization
Cluster ions
Ammonium salts
Instrumentation
Mass spectrum
Thermospray
Ionic cluster
Ionization
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Summary:Cluster ion formation in thermospray ionization of ammonium salts with water as solvent is investigated and used to probe the state of the gas mixture at the end of the capillary vaporizer and effects of the gas expansion into the jet chamber. Experiments with ammonium nitrate reveal the formation of cluster ions by desolvation in the capillary and point to a nearly dry state of the gas mixture at the end of the capillary. A nearly dry state of the gas is also indicated by the particular conditions at which doubly charged cluster ions of ammonium chloride could be detected. For ammonium chloride the growth of cluster ions by recondensation of volatilization products in the jet chamber is observed. This effect reveals that the gas temperature remains significantly below the jet chamber temperature up to the sampling orifice even at higher jet chamber pressures.
ISSN:0168-1176
1873-2801
DOI:10.1016/0168-1176(93)87060-6