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A comparison between ion-to-photon and microchannel plate detectors

โœ Scribed by F. Dubois; R. Knochenmuss; R. Zenobi; A. Brunelle; C. Deprun; Y. Le Beyec

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
78 KB
Volume
13
Category
Article
ISSN
0951-4198

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โœฆ Synopsis

An alternative detector for time-of-flight mass spectrometry, the ion-to-photon detector, detecting light produced when ions impact a surface coated with a fluorescent compound, was compared to a conventional microchannel plate detector. Single ion experiments showed that, for a given energy, the efficiency of the ion-to-photon detector relative to the microchannel plate detector decreases as the molecular mass of the impinging ion increases. This decrease becomes less pronounced for larger ions. Seen as a function of the ion velocity, a linear relationship was found. The conversions into photons and electrons were also compared. It was found that 22 keV ions up to 150 Da produced more photons than secondary electrons. For larger ions at this energy, the opposite was observed.

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