Lists possible compositions of exact masses in mass-spectrometry.

Context-sensitive help is given on the statusbar. As a matter of fact, this application will prove to be self-explanatory for MS experts.

Calculations are based on the following exact masses of atoms:

EM (Short from Exact Mass) is a freeware utility that accepts an exact mass as determined by Mass Spectrometry and lists possible compositions of the atoms S, O, N, C and H.

• N = 14.0031
• O = 15.9949
• S = 31.9721
• H = 1.0078

· C = 12.0000