Desorption processes in the measurement of weak currents

It was previously shown that the experimental measurement of the lifetime of gas-phase negative ions formed in autoionization states during resonant electron capture by molecules is inherently fraught with inaccuracy due to adsorption of ions on the walls of the ionization chamber, with some of them...

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Bibliographic Details
Published inPhysics Uspekhi Vol. 63; no. 5; pp. 487 - 499
Main Authors Lukin, V G, Khvostenko, O G
Format Journal Article
LanguageEnglish
Published London Uspekhi Fizicheskikh Nauk, Russian Academy of Sciences and IOP Publishing 01.08.2020
IOP Publishing
Subjects
Autoionization
Beta decay
Electron capture
ion adsorption
Ionization chambers
lifetime of negative ions
mass spectrometry
Negative ions
resonant electron capture
temperature dependence
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Summary:It was previously shown that the experimental measurement of the lifetime of gas-phase negative ions formed in autoionization states during resonant electron capture by molecules is inherently fraught with inaccuracy due to adsorption of ions on the walls of the ionization chamber, with some of them surviving there and staying stabilized as 'eternal' till they eventually desorb back into the vacuum and merge with the total ion flow; this leads to an upward distortion of lifetime measurements. This paper describes a technique for removing desorbed ions from the total flow using an ion filter that lets only gas-phase ions pass into the detection system but detains the desorbed ions due to the differences among their kinetic energies.
ISSN:1063-7869
1468-4780
DOI:10.3367/UFNe.2019.07.038615