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Journal Article

The collision-free photochemistry of methyl azide at 157 nm: Mechanism and energy release.

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

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Fulltext (public)

2472160.pdf
(Publisher version), 850KB

Supplementary Material (public)

2472160_Suppl
(Supplementary material), 503B

Citation

Quinto-Hernandez, A., Lee, S. H., & Wodtke, A. M. (2017). The collision-free photochemistry of methyl azide at 157 nm: Mechanism and energy release. The Journal of Chemical Physics, 147(6): 064307. doi:10.1063/1.4997783.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-CA2B-C
Abstract
Synchrotron radiation VUV-photoionization based photofragment translational spectroscopy was used to identify the primary and secondary photodissociation reactions of methyl azide (CH3N3) at 157 nm under collision-free conditions. Two primary dissociation channels are identified, leading to CH3 + N3 (the radical channel) and CH3N + N2 (the molecular elimination channel). The last channel is the major dissociation pathway, but unlike work at longer photolysis wavelengths, here, the radical channel exclusively produces the higher energy isomer cyclic-N3. Product time-of-flight data for both channels were obtained and compared with earlier work on methyl azide photochemistry at 193 nm based on electron impact ionization, allowing us to estimate a product branching ratio ΦCH3-N3 ΦCH3N-N2 =2.3%±0.6%97.7%±0.6%.