Investigating ion-surface collisions with a niobium superconducting tunnel junction detector in a time-of-flight mass spectrometer
The performance of an energy sensitive, niobium superconducting tunnel junction detector is investigated by measuring the pulse height produced by impacting molecular and atomic ions at different kinetic energies. Ions are produced by laser resorption and matrix-assisted laser desorption in a time-of-flight mass spectrometer. Results show that the STJ detector pulse height decreases for increasing molecular ion mass, passes through a minimum at around 2000 Da, and the increases with increasing mass of molecular ions above 2000Da. The detector does not show a decline in sensitivity for high mass ions as is observed with microchannel plate ion detectors. These detector plus height measurements are discussed in terms of several physical mechanisms involved in an ion-surface collision.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director, Office of Science. Office of Biological and Environmental Research. Life Sciences Division (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 753093
- Report Number(s):
- LBNL-44341; R&D Project: RESS04; ISSN 0951-4198; TRN: AH200026%%1
- Journal Information:
- Rapid Communications in Mass Spectrometry, Other Information: Submitted to Rapid Communications in Mass Spectrometry; (1 Dec 1999); PBD: 1 Dec 1999
- Country of Publication:
- United States
- Language:
- English
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