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Issue 29, 2006
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Photodissociation dynamics of dichlorocarbene at 248 nm

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Abstract

The dynamics of the 248 nm photodissociation of the CCl2 molecule have been investigated in a molecular beam experiment. The CCl2 parent molecule was generated in a molecular beam by pyrolysis of CHCl3, and both CCl2 and the CCl photofragment were detected by laser fluorescence excitation. The 248 nm attenuation cross sections was estimated from the reduction of the CCl2 signal as a function of the photolysis laser fluence. The internal state distribution of the CCl photofragment was derived from analysis of laser fluorescence excitation spectra in the A 2Δ − X 2Π band system. The CCl(X 2Π, v = 0) rotational state distribution was found to be bimodal, with maximum populations at N ≈ 10 and 85, and was dependent upon the source backing pressure, and hence upon the internal state distribution of the CCl2 precursor. The 248 nm photodissociation dynamics appears to involve two separate channels, namely nearly impulsive rotational energy release and predissociation with little rotational energy imparted to the CCl fragment.

Graphical abstract: Photodissociation dynamics of dichlorocarbene at 248 nm

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Publication details

The article was received on 19 May 2006, accepted on 13 Jun 2006 and first published on 22 Jun 2006


Article type: Paper
DOI: 10.1039/B607094A
Citation: Phys. Chem. Chem. Phys., 2006,8, 3446-3452

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    Photodissociation dynamics of dichlorocarbene at 248 nm

    S. K. Shin and P. J. Dagdigian, Phys. Chem. Chem. Phys., 2006, 8, 3446
    DOI: 10.1039/B607094A

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