Fig. 2

Top: the background subtracted pulse-height spectrum obtained for
CH3CH2OH using the IID
system without the grid in front of the detector. The large peak at high energy is
due to particles impacting at full beam energy. If losses of heavy fragments passing
by the detector due to their high transverse energy would occur, one or two smaller
peaks at lower energies would indicate that. It is clear that no loss of heavy
fragments are observed. The sharp feature at the leftmost position is due to noise
in the detector system. Bottom: the background subtracted
pulse-height spectrum obtained for
CH3CH2OH
using the
IID system with the grid inserted in front of the detector. The three major peaks
are due to detection of fragments containing one, two or three heavy atoms,
respectively. The sharp feature at very low mass/energy is due to noise in the
detector system mixed with signal from hydrogen fragments.
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