Comparative study of photodissociation and surface-induced dissociation by laser desorption Fourier transform mass spectrometry.
作者： John A. Castoro , Lydia M. Nuwaysir , Carl F. Ijames , Charles L. Wilkins
DOI: 10.1021/AC00043A010
关键词:
摘要: Photodissociation (PD) and surface-induced dissociation (SID) are compared for structural analysis of several nonvolatile compounds analyzed by laser desorption Fourier transform mass spectrometry (LD/FTMS). SID PD a porphyrin two metalloporphyrins were investigated using variety experimental conditions. Optimum information is obtained from when parent ions irradiated relatively long times (10-30 s) 575-nm radiation short (0.5-1 308- or 388-nm radiation. Shorter irradiation in the visible region resulted less efficient production structurally significant product ions, while longer ultraviolet produced more nonspecific fragment apparently at expense ions. conversion efficiencies porphyrins estimated collision energies 25 to 360 eV, with maximum efficiency found 62- 115-eV studied. Results concurrent study on combined use MS/MS/MS discussed context these results. The MS3 ion spectra generated techniques differ significantly than MS2 spectra. These data suggest some general guidelines MSn studies LD/FTMS, employing activation.
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