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Instruments and methods of investigation


Desorption processes in the measurement of weak currents

,
Institute of Molecular and Crystal Physics, Ufa Research Center, Russian Academy of Sciences, prosp. Oktyabrya 151, Ufa, 450075, Russian Federation

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.

Fulltext pdf (889 KB)
Fulltext is also available at DOI: 10.3367/UFNe.2019.07.038615
Keywords: resonant electron capture, lifetime of negative ions, temperature dependence, ion adsorption, mass spectrometry
PACS: 34.35.+a, 37.20.+j (all)
DOI: 10.3367/UFNe.2019.07.038615
URL: https://ufn.ru/en/articles/2020/5/c/
000555764100003
2-s2.0-85090225560
2020PhyU...63..487L
Citation: Lukin V G, Khvostenko O G "Desorption processes in the measurement of weak currents" Phys. Usp. 63 487–499 (2020)
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Received: 11th, April 2019, revised: 19th, June 2019, 11th, July 2019

Оригинал: Лукин В Г, Хвостенко О Г «Процессы десорбции при измерении слабых токов» УФН 190 525–538 (2020); DOI: 10.3367/UFNr.2019.07.038615

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