There would be seven peaks if you could observe them all while considering no decomposition of the ion into smaller fragments.
Each sulfur isotope would give a peak so there are three possible combinations of the hydrogen isotopes:
H-H (m/z = 2), H-D (m/z = 3) and D-D (m/z = 4).
Thus, you will find 4 × 3 = 12 components for the molecular ion.
However, some of these peaks will overlap each other so the stable isotopes of sulfur have masses 32, 33, 34, and 36.
Thus, the expected peaks will be:
32S:m/z=34,35,36
33S:m/z=35,36,37
34S:m/z=36,37,38
36S:m/z=38,39,40
If every peak were visible, you would see seven peaks in total.
They would have m/z = 34, 35, 36, 37, 38, 39, 40.
Isotope peaks are ionic parts of the same chemical equation that are more often than not visible to different adjoining crests inferable to particles of distinctive isotopic compositions.
The number of isotope crests and the relative concentration of each crest depends on the chemical equation of the ionic part and the normal isotopic composition of its constituent components.
Learn more about isotopes at
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