Time-of-flight measurements of secondary organic ions produced by 1 keV to 16 keV primary ions

The Manitoba time-of-flight mass spectrometer is described briefly. Relative yields for the prominent ions in the secondary ion spectrum of the amino acid alanine have been measured for primary alkali ions (Cs+, K+, Na+ and Li+) at energies from 1 keV to 16 keV. Yields increase greatly with increasing energy and with the mass of the bombarding particle, suggesting that in this energy region the nuclear stopping is mainly responsible for the secondary ion production. (orig.)