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Proceedings Paper

Photodissociation rate of acetaldehyde to HCO + CH3
Author(s): Shiu-Huang Lee; I. C. Chen
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Paper Abstract

Acetaldehyde supersonically cooled was excited to the S1 state with a UV laser in the wavelength range of 300 - 319 nm. Fragment HCO was detected by laser-induced fluorescence at the transition of B - X O00. The appearance rate of HCO was detected by probing the QR0 (10) transition. The formation threshold of HCO is determined to be 317.5 nm from the onset of the measured appearance rate. No vibrational promoting mode was found to produce HCO. Emission decay curves of excited acetaldehyde were recorded in the same wavelength region. The time constant of the slow component of acetaldehyde emission starts to decrease at an excitation wavelength 317.5 nm near the formation threshold of HCO. The decay rate of this slow component is approximately equal to the appearance rate of HCO at the same wavelength. Strong interaction between the S1 and T1 states in acetaldehyde is implied by these experimental results.

Paper Details

Date Published: 18 September 1995
PDF: 7 pages
Proc. SPIE 2548, Laser Techniques for State-Selected and State-to-State Chemistry III, (18 September 1995); doi: 10.1117/12.220859
Show Author Affiliations
Shiu-Huang Lee, National Tsing Hua Univ. (Taiwan)
I. C. Chen, National Tsing Hua Univ. (Taiwan)

Published in SPIE Proceedings Vol. 2548:
Laser Techniques for State-Selected and State-to-State Chemistry III
John W. Hepburn, Editor(s)

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