title: Fragmentation of polyatomic molecules by grazing incidence surface-induced dissociation (GI-SID).
abstract: The grazing incidence surface-induced dissociation (GI-SID) of n-hexadecylpyridinium and verapamil ions generated by fission fragment desorption was studied. These molecules show the effect of enhanced surface-induced dissociation at grazing incidence as it was observed in former experiments with metal organic ions. A liquid film of perfluorinated polyether is used as collision surface. Small hydrocarbon fragment ions predominate in the GI-SID spectra. Pyridine ions appear as specific fragment ions in the GI-SID spectrum of n-hexadecylpyridinium. The GI-SID conversion efficiency varies in the range 40-70%. The experimental results are discussed within the scope of a quantum mechanical model which is based on the accumulation of internal molecular energy by resonant excitation of collective vibrational states and energy transfer to a trap bond due to dipole-dipole interactions. In this context the GI-SID spectra of n-hexadecylpyridinium and verapamil ions are compared with the fragmentation occurring in regular (252)Cf plasma desorption mass spectrometry.
authors.affiliation: Fachbereich Chemie, Philipps-Universität Marburg, D-35032 Marburg, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Wieghaus
authors.forename: L
authors.initials: L
authors.lastname: Schmidt
authors.forename: A M
authors.initials: AM
authors.lastname: Popova
authors.forename: V V
authors.initials: VV
authors.lastname: Komarov
authors.forename: H
authors.initials: H
authors.lastname: Jungclas
mesh_terms: D002594:Cetylpyridinium / Q000032:analysis / Q000737:chemistry*; D005466:Fluorocarbons; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods; D018629:Spectrometry, Mass, Secondary Ion / Q000379:methods; D013499:Surface Properties; D014700:Verapamil / Q000032:analysis / Q000737:chemistry*
chemical_list: D005466:Fluorocarbons; D014700:Verapamil; D002594:Cetylpyridinium