Photodissociation of bromoform at 248 nm: Single and multiphoton processes Academic Article

abstract

• We have performed photodissociation experiments on CHBr3 at 248 nm using VUV ionization photofragment translational spectroscopy. Prompt C-Br bond fission is the dominant single-photon dissociation channel. In addition to primary Br and CHBr2 signals, we observe Br, CHBr, CBr, HBr, and Br2 products attributed to secondary photodissociation of CHBr2 and CHBr. There are three competing fragmentation channels from the photodissociation of CHBr2: CHBr + Br, CH + Br2, and CBr + HBr. The conclusion that Br2 fragments do not arise from a single-photon channel in appreciable yield is supported by transient FM absorption measurements of the CHBr radical. Because the molecular HBr and Br2 detachment channels are multiphoton processes, they will have very little impact on the atmospheric chemistry of CHBr3. We conclude that the most important photodissociation channel of CHBr3 in the UV region is C-Br bond breaking.

authors

• North, Simon

published proceedings

• JOURNAL OF PHYSICAL CHEMISTRY A

author list (cited authors)

• Zou, P., Shu, J. N., Sears, T. J., Hall, G. E., & North, S. W.

citation count

• 51

complete list of authors

• Zou, P||Shu, JN||Sears, TJ||Hall, GE||North, SW

publication date

• March 2004

publisher

• American Chemical Society (ACS)  Publisher

published in

• The Journal of Physical Chemistry A: Isolated Molecules, Clusters, Radicals, and Ions; Environmental Chemistry, Geochemistry, and Astrochemistry; Theory  Journal

keywords

• 34 Chemical Sciences
• 3406 Physical Chemistry
• 51 Physical Sciences
• 5102 Atomic, Molecular And Optical Physics

Digital Object Identifier (DOI)

• 10.1021/jp0310394

start page

• 1482

end page

• 1488

volume

• 108

issue

• 9

URL

• http%3A%2F%2Fdx.doi.org%2F10.1021%2Fjp0310394