Mass spectrum

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  • Created by: ToroCS
  • Created on: 06-02-21 13:44

Mass spectrum

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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