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- W2071878668 abstract "Abstract An apparatus is described which provides an alternative to collisional activation for distinguishing some selected isomeric molecular ions. A mass filter selects the molecular ion beam, which is crossed by the output of an excimer laser. Photofragmentation products are monitored by a magnetic sector mass spectrometer downstream of the interaction zone. Five criteria can be used to distinguish between isomeric molecular ions: (1) the photofragment mass spectra; (2) the normalized photogfragment intensities; (3) the kinetic energy spectra of the observed photofragments; (4) the dependence of criteria (1)–(3) on laser polarization; and (5) the dependence of criteria (1)–(4) on the laser wavelength. The scheme is applied to the isomeric pair HCO + −COH + . At 193 nm, decomposition into the products CO + +H is barely endothermic for HCO + but ca. 1.7 eV exothermic for COH + . The normalized intensity of CO + from photofragmentation of a presumed COH + target is found to be nine times that from an HCO + target." @default.
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- W2071878668 date "1989-01-01" @default.
- W2071878668 modified "2023-09-26" @default.
- W2071878668 title "Isomeric molecular identification by UV laser photofragmentation" @default.
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- W2071878668 doi "https://doi.org/10.1016/0168-1176(89)80007-2" @default.
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