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TOF Issues
It appears that TOF is the method of choice because
- ns timing in a flight time of ms => ppm resolution!
But Carbon foils set the lower energy limit, and limit the resolution for the MS. Worse yet, no replacement for C-foils has been found that is any better in charge state, energy straggle, strength...
The longer the TOF, the higher the resolution, however, pathlengths are limited by instrument size
THEREFORE foilless systems must be developed.