. . . . "Grepl, Martin" . "RIV/61989592:15310/08:00005799" . . . . "0951-4198" . "Roithov\u00E1, Jana" . "[59AE6E08FD8E]" . "P(KJB400550704), P(LC07017), S, Z(AV0Z50200510), Z(MSM0021620857), Z(MSM6198959216)" . . . "Ionization and fragmentation of monochloro-isomers of 3-hydroxy-2-phenyl-4(1H)-quinolinone"@en . . "Ionization and fragmentation of monochloro-isomers of 3-hydroxy-2-phenyl-4(1H)-quinolinone" . "4"^^ . "GB - Spojen\u00E9 kr\u00E1lovstv\u00ED Velk\u00E9 Brit\u00E1nie a Severn\u00EDho Irska" . "373285" . "Hradil, Pavel" . . "3"^^ . . "15310" . . . "Electron ionization (EI), methane chemical ionization (CI), and collision-induced dissociation (CID) mass spectra of complete series of positional monochloro-isomers of 3-hydroxy-2-phenyl-4(1H)-quinolinone are evaluated and discussed. It is shown that in the CI experiments, in addition to the protonated precursor molecules, odd-electron molecular ions are formed and this affects the appearance of the CID spectra. The influence of different direct probes and other experimental parameters such as the pressure of the reagent gas, isolation width, or collision energy was studied. El, Cl and CID spectra of the positional isomers show essentially the same fragmentation pathways but comparisons of the relative signal intensities of various product ions reveal some positional effects. Different isomers are also distinguished. The compounds call be divided into two groups using diagnostic ions (chloro substitution of the quinolinone moiety or the phenyl ring) or identified using a created spectral database. It" . "22" . "RIV/61989592:15310/08:00005799!RIV10-MSM-15310___" . "18" . "ELECTRON-IMPACT; MASS-SPECTRA; X-RAY; DERIVATIVES; DENSITY"@en . . "Electron ionization (EI), methane chemical ionization (CI), and collision-induced dissociation (CID) mass spectra of complete series of positional monochloro-isomers of 3-hydroxy-2-phenyl-4(1H)-quinolinone are evaluated and discussed. It is shown that in the CI experiments, in addition to the protonated precursor molecules, odd-electron molecular ions are formed and this affects the appearance of the CID spectra. The influence of different direct probes and other experimental parameters such as the pressure of the reagent gas, isolation width, or collision energy was studied. El, Cl and CID spectra of the positional isomers show essentially the same fragmentation pathways but comparisons of the relative signal intensities of various product ions reveal some positional effects. Different isomers are also distinguished. The compounds call be divided into two groups using diagnostic ions (chloro substitution of the quinolinone moiety or the phenyl ring) or identified using a created spectral database. It"@en . . . . "Ionization and fragmentation of monochloro-isomers of 3-hydroxy-2-phenyl-4(1H)-quinolinone" . . "Lemr, Karel" . . . . "Rapid Communications in Mass Spectrometry" . "10"^^ . . "Ionization and fragmentation of monochloro-isomers of 3-hydroxy-2-phenyl-4(1H)-quinolinone"@en . . .