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Issue 2, 2014
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Caging of Cl atoms from photodissociation of CF2Cl2 in clusters

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Abstract

We investigate the photodissociation dynamics of freon CF2Cl2 by velocity map imaging at 193 nm. The Cl fragment images are recorded in various expansion regimes corresponding to isolated molecules and molecules in rare gas clusters. The molecular kinetic energy distributions are dominated by a peak at Ekin(Cl) ≈ 0.97 eV corresponding to the direct C–Cl bond dissociation but they also reveal features at lower kinetic energies. Possible mechanisms leading to these slow Cl atoms are discussed. The photodissociation in clusters is investigated in two regimes: (i) small Ar clusters with the CF2Cl2 molecule embedded in approximately one solvation Ar layer; (ii) large Xen, [n with combining overline] ≈ 100–500, clusters with embedded CF2Cl2 molecules. In the former clusters we observe caging yielding the Cl fragments with zero kinetic energy and direct exit resulting in fragments with the kinetic energies corresponding to the fragments from isolated molecules. In the latter case (ii) only the caged Cl fragments are observed.

Graphical abstract: Caging of Cl atoms from photodissociation of CF2Cl2 in clusters

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Publication details

The article was received on 07 May 2013, accepted on 20 Jun 2013 and first published on 24 Jun 2013


Article type: Paper
DOI: 10.1039/C3CP51926K
Citation: Phys. Chem. Chem. Phys., 2014,16, 421-429
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    Caging of Cl atoms from photodissociation of CF2Cl2 in clusters

    V. Poterya, J. Kočišek, A. Pysanenko and M. Fárník, Phys. Chem. Chem. Phys., 2014, 16, 421
    DOI: 10.1039/C3CP51926K

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