Photofragmentation translational spectroscopy of methyl azide (CH3N3) 
photolysis at 193 nm: molecular and radical channel product branching ratio.

Quinto-Hernandez, A.; Doehla, J.; Huang, W.; Lien, C.; Lin, W.; Min-Lin, J.; Wodtke, A. M.

doi:10.1021/jp301562c

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Photofragmentation translational spectroscopy of methyl azide (CH3N3) photolysis at 193 nm: molecular and radical channel product branching ratio.

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Wodtke, A. M.
Department of Dynamics at Surfaces, MPI for biophysical chemistry, Max Planck Society;

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Citation

Quinto-Hernandez, A., Doehla, J., Huang, W., Lien, C., Lin, W., Min-Lin, J., et al. (2012). Photofragmentation translational spectroscopy of methyl azide (CH3N3) photolysis at 193 nm: molecular and radical channel product branching ratio. The Journal of Physical Chemistry A, 116(19), 4695-4704. doi:10.1021/jp301562c.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-9C12-E

Abstract

We describe molecular-beam photofragment translational spectroscopy (PTS) experiments using electron impact (EI) ionization product detection to investigate the 193 nm photodissociation of methyl azide (CH3N3) under collision-free conditions. These experiments are used to derive the branching ratio between channels 1 and 2 [(1) radical channel: CH3N3 + hν (λ = 193 nm) → CH3 + N3; (2) molecular channel: CH3N3 + hν (λ = 193 nm) → CH3N + N2], which have been reported in a previous VUV-photoionization based PTS study.(1) Using electron impact ionization cross sections and ion fragmentation ratios for the various detected products, we derive the branching ratio (XCH3–N3)/(XCH3N–N2) = (0.017 ± 0.004)/(0.983 ± 0.004). Based on analysis of the kinetic energy release in the radical channel, we find that the cyclic form of N3 is the dominant product in the radical channel. Only a small fraction of the radical channel produces ground state linear N3.