N
X
C
Hal
O
N
S
P Si
Natural
Products
Solvents
C
C
C
C C
C
8.13 Spectra of Solvents and References
439
Calibration Compounds in Negative 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)
KI (K + , 39.1; I – , 126.9) in glycerol (formation of [glycerol m -H n +K p +I q ] - )
100
50
0
600
500
400
300
200
100
0
80
40
0
1300
1200
1100
1000
900
800
700
80
40
0
1900
1800
1700
1600
1500
1400
1300
19
592
692
124
498
211
298
492
1306
398
243
163
1106
760
894
860
960 1006
1206 1294
1406
1506
1606
1706
1806
1906
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
200
150
100
50
0
100
50
0
1000
950
900
850
800
750
700
650
600
550
500
500
450
400
350
300
250
200
43
105
149
85
281
193
237
325 369 413 457
501 545 589 633 677 721 765 809
853
61
897 941
100
50
0
500
450
400
350
300
250
200
150
100
50
0
100
50
0
1000
950
900
850
800
750
700
650
600
550
500
392.8
91.0
126.9
292.8
256.9
198.9 226.9
458.6
59.0
319.0
422.8
956.2
588.6
624.5
754.5
790.4
920.4