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Slice imaging of the photodissociation of acetaldehyde at 248 nm. Evidence of a roaming mechanism

Rubio-Lago, L; Amaral, GA; Arregui, A; Izquierdo, JG; Wang, F; Zaouris, D; Kitsopoulos, TN; (2007) Slice imaging of the photodissociation of acetaldehyde at 248 nm. Evidence of a roaming mechanism. Physical Chemistry Chemical Physics , 9 (46) pp. 6123-6127. 10.1039/b708310f.

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Abstract

The photodissociation of acetaldehyde in the molecular channel yielding CO and CH4 at 248 nm has been studied, probing different rotational states of the CO(n = 0) fragment by slice ion imaging using a 2+1 REMPI scheme at around 230 nm. From the slice images, clear evidence of the co-existence of two different mechanisms has been obtained. One of the mechanisms is consistent with the well-studied conventional transition state in which CO products appear rotationally excited, and the second is consistent with a roaming mechanism. This roaming mechanism is characterized by a low rotational energy disposal into the CO fragment as well as by a very low kinetic energy release, corresponding to a high internal energy in the CH4 counter-fragment.

Type: Article
Title: Slice imaging of the photodissociation of acetaldehyde at 248 nm. Evidence of a roaming mechanism
DOI: 10.1039/b708310f
Publisher version: http://dx.doi.org/10.1039/b708310f
Language: English
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1475108
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