10-200, and mixed (C2H2) m  · Rg n (Rg = Ar, Xe) species where the single acetylene molecule or small cluster can be either adsorbed on the surface or embedded inside the rare gas cluster. We review our previous experiments in which the photodissociation dynamics was studied by the H-fragment time-of-flight (TOF) technique, and extend the experiments by measurements with a new velocity map imaging set up. We observe an unusual manifestation of the cage effect leading to a formation of fast hydrogen fragments. Such observation is interpreted as resulting from a two-step process: first, the initially excited molecule is quenched by the cluster cage to a vibrationally hot ground state; then the molecule dissociates upon subsequent photoabsorption from the vibrationally excited state. Thus the faster fragments result from the caging combined with the multiphoton processes. In xenon clusters with acetylene molecules adsorbed on the surface, we have also found evidence for organo-xenon molecule HXeCCH generated in the singlet excited state of a acetylene-xenon complex."> 10-200, and mixed (C2H2) m  · Rg n (Rg = Ar, Xe) species where the single acetylene molecule or small cluster can be either adsorbed on the surface or embedded inside the rare gas cluster. We review our previous experiments in which the photodissociation dynamics was studied by the H-fragment time-of-flight (TOF) technique, and extend the experiments by measurements with a new velocity map imaging set up. We observe an unusual manifestation of the cage effect leading to a formation of fast hydrogen fragments. Such observation is interpreted as resulting from a two-step process: first, the initially excited molecule is quenched by the cluster cage to a vibrationally hot ground state; then the molecule dissociates upon subsequent photoabsorption from the vibrationally excited state. Thus the faster fragments result from the caging combined with the multiphoton processes. In xenon clusters with acetylene molecules adsorbed on the surface, we have also found evidence for organo-xenon molecule HXeCCH generated in the singlet excited state of a acetylene-xenon complex."> Short review on the acetylene photochemistry in clusters: photofragme…
Počet záznamů: 1  

Short review on the acetylene photochemistry in clusters: photofragment caging and reactivity

    1.
    0384311 - ÚFCH JH 2013 RIV GB eng J - Článek v odborném periodiku
    Fárník, Michal - Poterya, Viktoriya - Kočišek, Jaroslav - Fedor, Juraj - Slavíček, P.
    Short review on the acetylene photochemistry in clusters: photofragment caging and reactivity.
    Molecular Physics. Roč. 110, 21-22 (2012), s. 2817-2828. ISSN 0026-8976. E-ISSN 1362-3028
    Grant CEP: GA ČR GA203/09/0422; GA ČR GAP208/11/0161
    Institucionální podpora: RVO:61388955
    Klíčová slova: acetylene clusters * photochemistry * molecular beams
    Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
    Impakt faktor: 1.670, rok: 2012

    We have investigated solvent effects on acetylene photodissociation in clusters of different sizes and compositions generated in molecular beams: pure acetylene clusters (C2H2) n , <inline-formula id="ILM0001"> <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="tmph_a_706389_o_ilm0001.gif"/> </inline-formula>10-200, and mixed (C2H2) m  · Rg n (Rg = Ar, Xe) species where the single acetylene molecule or small cluster can be either adsorbed on the surface or embedded inside the rare gas cluster. We review our previous experiments in which the photodissociation dynamics was studied by the H-fragment time-of-flight (TOF) technique, and extend the experiments by measurements with a new velocity map imaging set up. We observe an unusual manifestation of the cage effect leading to a formation of fast hydrogen fragments. Such observation is interpreted as resulting from a two-step process: first, the initially excited molecule is quenched by the cluster cage to a vibrationally hot ground state; then the molecule dissociates upon subsequent photoabsorption from the vibrationally excited state. Thus the faster fragments result from the caging combined with the multiphoton processes. In xenon clusters with acetylene molecules adsorbed on the surface, we have also found evidence for organo-xenon molecule HXeCCH generated in the singlet excited state of a acetylene-xenon complex.
    Trvalý link: http://hdl.handle.net/11104/0215304

     
     
Počet záznamů: 1  

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