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Issue 6, 2011
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Product pair correlation in CH3OH photodissociation at 157 nm: the OH + CH3 channel

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Abstract

The OH + CH3 product channel for the photodissociation of CH3OH at 157 nm was investigated using the velocity map imaging technique with the detection of CH3 radical products via (2+1) resonance-enhanced multiphoton ionization (REMPI). Images were measured for the CH3 formed in the ground and excited states (v2 = 0, 1, 2, and 3) of the umbrella vibrational mode and correlated OH vibrational state distributions were also determined. We find that the vibrational distribution of the OH fragment in the OH + CH3 channel is clearly inverted. Anisotropic distributions for the CH3 (v2 = 0, 1, 2, and 3) products were also determined, which is indicative of a fast dissociation process for the C–O bond cleavage. A slower CH3 product channel was also observed, that is assigned to a two-step photodissociation process, in which the first step is the production of a CH3O(X 2E) radical via the cleavage of the O–H bond in CH3OH, followed by probe laser photodissociation of the nascent CH3O radicals yielding CH3(X 2A1, v = 0) products.

Graphical abstract: Product pair correlation in CH3OH photodissociation at 157 nm: the OH + CH3 channel

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Publication details

The article was received on 13 Sep 2010, accepted on 29 Oct 2010 and first published on 26 Nov 2010


Article type: Paper
DOI: 10.1039/C0CP01794A
Citation: Phys. Chem. Chem. Phys., 2011,13, 2350-2355
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    Product pair correlation in CH3OH photodissociation at 157 nm: the OH + CH3 channel

    Z. Chen, A. T. J. B. Eppink, B. Jiang, G. C. Groenenboom, X. Yang and D. H. Parker, Phys. Chem. Chem. Phys., 2011, 13, 2350
    DOI: 10.1039/C0CP01794A

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