Pickup and Photodissociation of Hydrogen Halides in Floppy Neon Clusters

0181712 - UFCH-W 20030144 RIV US eng J - Článek v odborném periodiku
Slavíček, Petr - Jungwirth, Pavel - Lewerenz, M. - Nahler, N. H. - Fárnik, M. - Buck, U.
Pickup and Photodissociation of Hydrogen Halides in Floppy Neon Clusters.
Journal of Physical Chemistry A. Roč. 107, - (2003), s. 7743-7754. ISSN 1089-5639. E-ISSN 1520-5215
Grant CEP: GA MŠMT LN00A032
Výzkumný záměr: CEZ:AV0Z4040901
Klíčová slova: photodissociation * neon clusters
Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
Impakt faktor: 2.792, rok: 2003

Neon clusters with an average sizes in the range from n=100 to 1600 atoms are generated in an adiabatic expansion and are doped with a single HBr or HCl molecule in a pick-up process. The hydrogen halide molecule is photodissociated by a UV laser and the outgoing H fragment is ionized by resonance enhanced multi-photon ionization (REMPI) in a (2+1) excitation scheme at a wavelength of 243 nm. The H ions are extracted in a Wiley-McLaren time-of-flight mass spectrometer operating in the low-field mode to be sensitive to low velocities. Themeasured kinetic energy distribution are compared with quasi-classical molecular dynamics simulations, which allow for a detailed analysis of the underlying processes. Simultaneously, the neon cluster phase behavior, the pick-up procedure, and the photodissociation dynamics are investigated theoretically. The phase behavior is studied by means of the Instantaneous Normal Modes approach with a newly introduced projection technique.
Trvalý link: http://hdl.handle.net/11104/0001926