My physics is not good, please kindly don't judge my physics.
In some molecular weight calculator to get mono-isotope neutral mass for atoms listed below.
In FTICR, we could find these difference. For example,
m/z 101.960035, ^1H^35Cl^16O3^18O
m/z 101.952838, ^1H^37Cl^16O4
Here is my question...