Mass spectrometry of hydrogen bonded clusters of heterocyclic molecules: Electron ionization vs. photoionization

0355369 - ÚFCH JH 2012 RIV NL eng J - Journal Article
Poterya, Viktoriya - Tkáč, Ondřej - Fedor, Juraj - Fárník, Michal - Slavíček, P. - Buck, U.
Mass spectrometry of hydrogen bonded clusters of heterocyclic molecules: Electron ionization vs. photoionization.
International Journal of Mass Spectrometry. Roč. 290, 2-3 (2010), s. 85-93. ISSN 1387-3806. E-ISSN 1873-2798
R&D Projects: GA AV ČR KAN400400651; GA AV ČR KJB400400902; GA ČR GA203/09/0422
Institutional research plan: CEZ:AV0Z40400503
Keywords : cluster photochemistry * hydrogen bonded clusters * heterocyclic molecule
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 2.009, year: 2010

Clusters of small heteroaromatic ring molecules pyrrole, imidazole and pyrazole were studied in a molecular beam experiment. Neutral cluster size distributions under various expansion conditions were probed by a scattering experiment with a He-atom beam. The clusters were ionized by electrons and their mass spectra were measured by a quadrupole mass spectrometer. Alternatively, the ionization was achieved by a non-resonant subsequent multiphoton process with 193 nm photons and the time-of-flight mass spectra were recorded. (1) The differences in the methods of cluster ionization, namely subsequent multiphoton and single photon ionization, and electron ionization are discussed. (2) More importantly, the differences between the ionization of pyrrole clusters on the one side, and imidazole and pyrazole clusters on the other side are studied.
Permanent Link: http://hdl.handle.net/11104/0194154