By Gould R.F. (ed.)
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Extra info for Multicomponent Polymer Systems
Chait et al. (1984) used this technique to generate mass spectra of polyether oligomers having nominal molecular weights of 750–2000 Da. The use of 252 Cf MS in the investigation of proteins and peptides has been demonstrated by various groups; a summary of these works can be found in an extensive chapter by Macfarlane et al. (1991). Although 252 Cf MS has amply demonstrated its capability for the analysis of proteins and peptides, the diffusion of this highly promising technique remained very slow and could not attract the required investment to facilitate its dissemination.
Such needs are encouraging the search for other types of detectors which can deliver higher sensitivity and possibly address certain drawbacks associated with MCPs. Over the last decade there has been increasing interest in cryogenic detectors: however, we are still waiting to see their use on commercial instruments. Cryogenic detectors have been developed since the early 1980s for applications in particle physics, astrophysics, and material analysis. There are a number of reasons behind their use in these diverse fields.
The ability of these detectors to detect slow-moving massive ions with near 100% efficiency and the additional information gained from measuring the energy of the same ions have attracted a number of attempts to use them in TOF–MS. This type of detector has a number of characteristecs, which make its use in TOF–MS highly attractive: On paper cryogenic detectors should not exhibit any decrease in sensitivity for large masses. Any impacting particle will create a signal as long as the energy deposited exceeds the low noise level of the detector, typically a small fraction of electron volts.