relative abundance against m/z ratio
peak with greatest m/z - gives Mr of substance
below are due to fragmentation
Electrospray - substract 1 to peak to get Mr
>2 Br in molecule, ratio of peaks = 1:2:1 (^79Br:^81Br = 1:1 - two arrangements of ^79Br, ^81Br)
Cl in molecule, ratio of peaks = 3:1 - ^35Cl:^37Cl in ratio 3:1
9:6:1(2 Cl) - explained by probabilities 2^35Cl = 3/4 x 3/4 = 9/16; ^35Cl and ^37Cl, or ^37Cl and ^35Cl = (3/4 x 1/4) + (1/4 x 3/4) = 6/16; 2^37Cl = 1/4 x 1/4 = 1/16.
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