40
60
80
100
120
140
160
180
200
220
240
260
280
300
43
57
71
85
99
113 127 141 155 169 183 197 211 225 239 252 267
296
relative
intensity
m/z
30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260
189
203
218
233
248
relative intensity
m/z
30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250
153
165
179
195
238
m/z
relative intensity
A
B
C
Fig. 5.1 Variation of molecular peak intensities as the result of molecule stability. (a) 8-Isopropyl1,3-dimethylphenanthrene; (b) heneicosane; (c) 9-butyl-1,2,3,4-tetrahydroanthracene
5.1 Identification
99