The performance of an energy sensitive, niobium superconducting tunnel junction (STJ) detector is investigated by measuring the pulse height produced by impacting molecular and atomic ions at different kinetic energies. Ions are produced by laser desorption and matrix-assisted laser desorption in a time-of-light mass spectrometer. Our results show that the STJ detector pulse height decreases for increasing molecular ion mass, passes through a minimum at around 2000 Da, and then increases with increasing mass of molecular ions above 2000 Da. 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. (C) 2000 John Wiley and Sons, Ltd.
|Original language||English (US)|
|Number of pages||8|
|Journal||Rapid Communications in Mass Spectrometry|
|State||Published - Jan 1 2000|
ASJC Scopus subject areas
- Analytical Chemistry
- Organic Chemistry