Gallium ion TOF-SIMS fragment patterns from some metal-chlorides and -oxides can be qualitatively inferred. Considering the electron affinities of Cl and O, comparatively higher than those of other metal elements, rules of
nx ≥ (
y + 1) for positive ions and
nx ≤ (
y + 1) for negative ions were introduced and applied to infer the fragment patterns of metal-chlorides, M
xCl
y, where the oxidation number of metal M is
n. For oxides, M
xO
y (oxidation number of metal M is
n), the rules used to infer the fragment patterns
nx ≥ (2
y + 1) for positive ions and
nx ≤ (2
y + 1) for negative ions. Further, the effect of water on the surfaces of chlorides and oxides, and the fragment patterns of some metal-nitrates are discussed.
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