Rapid and ultra-sensitive GC/MS analyses with a microchannel plate array detector Part I: Possibilities of simultaneous ion detection in narrow-bore GC/MS
✍ Scribed by Leclercq, P. A. ;Snijders, H. M. J. ;Cramers, C. A. ;Maurer, K. H. ;Rapp, U.
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- English
- Weight
- 499 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0935-6304
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✦ Synopsis
Identification and detection limits for scanning and non-scanning mass spectrometers are discussed. It is theoretically deduced and experimentally confirmed that these limits are on the lowpico-and femtogram levels, respectively, when using conventional secondary electron multiplier-amplifier systems. The sensitivity can be increased at least tenfold by pulse-counting techniques, instead of current amplification, provided the chemical noise is sufficientlylow.Thepotentia1advantagesofadetection system for simultaneous ion detection in a significant mass range, for obtaining complete mass spectra in fast GC/MS analyses, are demonstrated. A double focusing mass spectrometer was constructed, using the well-proven Mattauch-Herzog principles. By application of an "electronic photoplate",substance identification inthe lowfemtogram rangeona millisecond timescale,sofaronly accessible for single ion monitoring techniques, is feasible.