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Hot ions of 9-cyanophenanthrene were produced by multiphoton ionization at 193 nm. The radiative cooling rate of the hot ions was measured thermometrically using time-resolved photodissociation (TRPD) as the internal energy probe. In this application of the TRPD technique two-photon dissociation of the ions at 355 nm was used to measure the rate for the C 2 H 2 loss channel as a...
In contrast to most ion dissociation methods, 193 nm ultraviolet photodissociation of electrosprayed melittin (2.8 kDa) and ubiquitin (8.6 kDa) molecular ions yields new c and z ions (backbone amine bond dissociation) that provide additional sequence information. Dissociation by collisions or infrared photons produce b and y ions; for cleavages between the same amino acids the c ion represents the...
Photodissociation experiments in dependence of wavelength and light intensity on C 4 H 4 fragment radical cations, produced by ionization of 1,5-hexadiyne, show that the photodissociation in the visible region is determined by a competition between one- and two-photon dissociation and photon-induced isomerization of vinyl acetylene radical cations to the methylene cyclopropene structure...
Carbon cluster cations from C +5 to C +19 were generated by laser ablation/ionization of graphite in the Fourier-transform ICR ion trapping mass spectrometer, and dissociated by excimer laser pulses with photon energy 6.43 eV. Branching ratios and relative apparent cross-sections were determined. Further mechanistic and thermochemical information was sought by several...
Photodissociation and collisionally activated dissociation have been used in conjunction with quadrupole ion trap tandem mass spectrometry. Visible (488.0 nm) and UV (333.6, 351.1, 363.8 nm) lines of a continuous wave argon ion laser were employed in photodissociation experiments to investigate the effect of ion activation process and energy deposition on fragmentation. Flutriafol ([(RS)-2.4 -difluoro-(1H-1,2,4-triazol-1-ylmethyl)benzhydrol])...
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