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                                                           APCI
                             Abundance                           295
                                                                          -
                                                                       [M-1]
                                55000
                                50000    102
                                45000
                                40000
                                35000
                                30000
                                25000
                                                                        342
                                20000
                                             129      203                      398
                                15000
                                10000          147
                                 5000             174                322
                                       81                224  251  285      373   425       499
                                   0
                                m/z->
                                         100   150    200   250    300   350   400    450
                                                           Electrospray
                               Abundance                                     409
                                                                                        -
                                                                                   [M+TFA]
                                65000
                                60000
                                55000
                                50000                                -
                                                                  [M+Cl]
                                45000
                                40000
                                                                    331
                                35000
                                30000
                                25000
                                20000
                                          113
                                15000
                                10000
                                 5000         147              295     358
                                       82  100   174  216231 253          385  427 451  483  511 535
                                   0
                                m/z->
                                         100   150  200   250   300   350   400   450  500
                             Figure 6.13  APCI and ESI mass spectra of HMX. (From Schilling, A.B., The
                             analysis of explosives constituents and metabolites with electrospray and APCI
                             LC/MS, presented at 44th ASMS Conference on Mass Spectrometry and Allied
                             Topics, Portland, OR, 1996.)
                                           NO                                   NO 2
                                           N                                    N
                                        CH 2   CH 2                          CH 2   CH 2

                                        N      N                             N      N
                                   O N     CH 2   NO                    O N     CH 2   NO
                                                                          2
                                    2
                                          DNX                                  MNX
                             Scheme 6



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