G-8 Theory and Principles of Operation
Beam from high and low mass ion:
The largest constant low mass background ion should be maintained below
the level of saturation of the TDC.
See also: This saturation effect is described in Effects of saturation on peak
shape on page B-51.
Low mass cut-off
Low mass cut-off stops low masses from reaching the detector. It does this by
cutting off the beam a set time before the push so that by the time the push
occurs the low masses have gone past the pusher and are not analyzed.
Air, water, CI gas and helium peaks can be of significant intensity and cutting
them off from the analyzer can significantly increase the lifetime of the
detector and reduces the potential for detector saturation. It is recommended
therefore that LMC should be used as a matter of routine.
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