Mass spectroscopy
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Last updated 9:47 PM on 4/22/26
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4 Terms
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MS ionises molecules - forms p... i...
Separates ions by m/z (mass:charge ratio)
Produces a mass spectrum
positive ions
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Molecular ion peak: on r... hand side, last proper peak
right
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Molecular ion peak gives ...
Base peak = tallest peak- most a... fragment
Fragmentation: molecular ion breaks into s... i...
Fragment peaks help identify s...o
mr, abundant, smaller ions, structure
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Common fragments:
CH₃⁺ = 15
OH⁺ = 17
CO⁺ = 28
CHO⁺ = 29
C₂H₅⁺ = 29
C₃H₇⁺ = 43
CH₃CO⁺ = 43
C₄H₉⁺ = 57
C₅H₁₁⁺ = 71
C₆H₅⁺ = 77
C₆H₅CH₂⁺ = 91
Fragments are ALWAYS p...
positive