Mass Spectrometry

See spectroscopy and spectrometry for why it’s called spectrometry and not spectroscopy

Topics

• Double Bond Equivalency

Isotope	Natural Abundance	M:M+2 Ratio
${}_{}^{}{}_{}^{32}\mathrm{S}:{}_{}^{}{}_{}^{34}\mathrm{S}$	95.0 : 4.2	25 : 1
${}_{}^{}{}_{}^{35}\mathrm{Cl}:{}_{}^{}{}_{}^{37}\mathrm{Cl}$	75.8 : 24.2	3 : 1
${}_{}^{}{}_{}^{79}\mathrm{Br}:{}_{}^{}{}_{}^{81}\mathrm{Br}$	50.7 : 49.3	1: 1

$\#carbons=\frac{I(M+1)}{0.011\cdot I(M)}$

• Number of carbons of a molecule defined by the intensity of the molecular ion peak $M$ and $M+1$