Photodissociation of the BrO radical using velocity map ion imaging: excited state dynamics and accurate D0(0)(BrO) evaluation

The Journal of Chemical Physics
Hahkjoon KimSimon W North

Abstract

We have studied the photodissociation dynamics of expansion-cooled BrO radical both above (278-281.5 nm) and below (355 nm) the A (2)Pi(3/2) state threshold using velocity map ion imaging. A recently developed late-mixing flash pyrolytic reactor source was utilized to generate an intense BrO radical molecular beam. The relative electronic product branching ratios at 355 nm and from 278 to 281.5 nm were determined. We have investigated the excited state dynamics based on both the product branching and the photofragment angular distributions. We find that above the O((1)D(2)) threshold the contribution of the direct excitation to states other than the A (2)Pi(3/2) state and the role of curve crossing is considerably larger in BrO compared to that observed for ClO, in agreement with recent theoretical studies. The measurement of low velocity photofragments resulting from photodissociation just above the O((1)D(2)) threshold provides an accurate and direct determination of the A (2)Pi(3/2) state dissociation threshold of 35418+/-35 cm(-1), leading to a ground state bond energy of D(0)(0)(BrO)=55.9+/-0.1 kcal/mol.

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Citations

Sep 27, 2006·The Journal of Chemical Physics·Fernando R Ornellas
May 16, 2012·The Journal of Chemical Physics·Antonio G S de Oliveira-FilhoKirk A Peterson
Jun 8, 2007·The Journal of Chemical Physics·Fernando R Ornellas
Nov 6, 2007·The Journal of Chemical Physics·Benjamin C SheplerKirk A Peterson
Mar 15, 2015·The Journal of Physical Chemistry. a·Dudley E ShallcrossCarl J Percival
Feb 10, 2006·Radiology·Min Hoan MoonYi Kyeong Chun
Sep 11, 2008·Pharmacogenomics·Sean P David, Marcus R Munafò
Dec 7, 2018·The Review of Scientific Instruments·Arthur G Suits
Mar 2, 2010·The Journal of Physical Chemistry. a·Daniel J GrantDavid A Dixon
Nov 3, 2006·The Journal of Physical Chemistry. a·Benjamin C Shepler, Kirk A Peterson
Dec 22, 2006·The Journal of Physical Chemistry. a·Kirk A PetersonHermann Stoll

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