Počet záznamů: 1

Velocity map imaging of HBr photodissociation in large rare gas clusters

  1. 1.
    0359045 - UFCH-W 2012 RIV US eng J - Článek v odborném periodiku
    Fedor, Juraj - Kočišek, Jaroslav - Poterya, Viktoriya - Votava, Ondřej - Pysanenko, Andriy - Lipciuc, M. L. - Kitsopoulos, T. N. - Fárník, Michal
    Velocity map imaging of HBr photodissociation in large rare gas clusters.
    Journal of Chemical Physics. Roč. 134, č. 15 (2011), s. 154303 ISSN 0021-9606
    Grant CEP: GA ČR GA203/09/0422
    Výzkumný záměr: CEZ:AV0Z40400503
    Klíčová slova: HBr photodissociation * clusters * photochemistry
    Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
    Impakt faktor: 3.333, rok: 2011

    We have implemented the velocity map imaging technique to study clustering in the pulsed supersonic expansions of hydrogen bromide in helium, argon, and xenon. The expansions are characterized by direct imaging of the beam velocity distributions. We have investigated the cluster generation by means of UV photodissociation and photoionization of HBr molecules. Two distinct features appear in the hydrogen atom photofragment images in the clustering regime: (i) photofragments with near zero kinetic energies and (ii) “hot” photofragments originating from vibrationally excited HBr molecules. The origin of both features is attributed to the fragment caging by the cluster. We discuss the nature of the formed clusters based on the change of the photofragment images with the expansion parameters and on the photoionization mass spectra and conclude that single HBr molecule encompassed with rare gas “snowball” is consistent with the experimental observations.
    Trvalý link: http://hdl.handle.net/11104/0196919