N
X
C
O
N
S
Hal
Solvents
Natural
Products
P Si
C
C
C C
C
C
436
8 Mass Spectrometry
P
P
N N
P
N
RO
RO
OR
OR
RO OR
R: CH 2 (CF 2 ) n H
n = 2, 4, 6, ...
100
50
0
600
500
400
300
200
100
0
20
0
1300
1200
1100
1000
900
800
700
20
0
1900
1800
1700
1600
1500
1400
1300
31
95
69
113
228
213
322
542
654
442
249
166
51
766
878
866
978
1078
1190
1290
1390
1470
1570 1622
1722
1922
100
50
0
200
150
100
50
0
1.0
0.5
0.0
1000
950
900
850
800
750
700
650
600
550
500
0.8
500
450
400
350
300
250
200
45
73
133
89
283
177
219
327 371 415
459
503 547 591 635 679 723 767 811
855
8.13.2 Spectra of Common FAB MS Matrix and Calibration Compounds
Fast atom bombardment (FAB) mass spectra (MS) usually exhibit signals for
the protonated or deprotonated molecular ions, [M±H]
±
, and protonated clusters,
[M n +X m ±H] ± (n, m = 0, 1, 2, …), of the sample and matrix molecules, X. Even traces of metal salts in the sample give rise to clusters of the type [M n +X m +metal cation] + . Na + (23 u) and K + (39 u) adducts are often found. The nature of the clusters
is often revealed by the regular intervals at which their peaks occur in the spectra.
Calibration Compounds in Positive Ionization FAB Mass Spectra
Ultramark 1621 (erroneously also referred to as perfluoroalkyl phosphazine)
Polyethylene glycol 600 (often used as internal reference for high resolution m/z
determinations)
CsI (Cs + , 132.9; I – , 126.9) in glycerol (formation of [glycerol m -H n +Cs p +I q ] + )
100
50
0
500
450
400
350
300
250
200
150
100
50
0
5.0
2.5
0.0
1000
950
900
850
800
750
700
650
600
550
500
392.7
75.0
132.9
93.1
277.1
185.1
225.0
409.0
45.0
57.0
317.0 356.8
448.9 484.8
576.8 616.7
652.5
668.9
708.7 744.6 800.8
836.6
876.5
928.7
540.9
X
C
O
N
S
Hal
Solvents
Natural
Products
P Si
C
C
C C
C
C
436
8 Mass Spectrometry
P
P
N N
P
N
RO
RO
OR
OR
RO OR
R: CH 2 (CF 2 ) n H
n = 2, 4, 6, ...
100
50
0
600
500
400
300
200
100
0
20
0
1300
1200
1100
1000
900
800
700
20
0
1900
1800
1700
1600
1500
1400
1300
31
95
69
113
228
213
322
542
654
442
249
166
51
766
878
866
978
1078
1190
1290
1390
1470
1570 1622
1722
1922
100
50
0
200
150
100
50
0
1.0
0.5
0.0
1000
950
900
850
800
750
700
650
600
550
500
0.8
500
450
400
350
300
250
200
45
73
133
89
283
177
219
327 371 415
459
503 547 591 635 679 723 767 811
855
8.13.2 Spectra of Common FAB MS Matrix and Calibration Compounds
Fast atom bombardment (FAB) mass spectra (MS) usually exhibit signals for
the protonated or deprotonated molecular ions, [M±H]
±
, and protonated clusters,
[M n +X m ±H] ± (n, m = 0, 1, 2, …), of the sample and matrix molecules, X. Even traces of metal salts in the sample give rise to clusters of the type [M n +X m +metal cation] + . Na + (23 u) and K + (39 u) adducts are often found. The nature of the clusters
is often revealed by the regular intervals at which their peaks occur in the spectra.
Calibration Compounds in Positive Ionization FAB Mass Spectra
Ultramark 1621 (erroneously also referred to as perfluoroalkyl phosphazine)
Polyethylene glycol 600 (often used as internal reference for high resolution m/z
determinations)
CsI (Cs + , 132.9; I – , 126.9) in glycerol (formation of [glycerol m -H n +Cs p +I q ] + )
100
50
0
500
450
400
350
300
250
200
150
100
50
0
5.0
2.5
0.0
1000
950
900
850
800
750
700
650
600
550
500
392.7
75.0
132.9
93.1
277.1
185.1
225.0
409.0
45.0
57.0
317.0 356.8
448.9 484.8
576.8 616.7
652.5
668.9
708.7 744.6 800.8
836.6
876.5
928.7
540.9