Fluorescence excitation spectra of HCO [tilde B][sup 2]A[prime]-[tilde X][sup 2]A[prime] in a supersonic jet

Journal Article · Wed Jun 01 04:00:00 EDT 1994 · Journal of Molecular Spectroscopy; (United States)

DOI:https://doi.org/10.1006/jmsp.1994.1148· OSTI ID:6956831

Shiu, Y J; Chen, I C ^[1]

---

1. National Tsing Hua Univ., Hsinchu (Taiwan, Province of China). Dept. of Chemistry

Formyl radical, HCO, is important in combustion of hydrocarbons and in atmospheric chemistry. The HCO radical was produced by photolysis of acetaldehyde in a supersonic molecular jet. HCO [tilde B][sup 2]A[prime]-[tilde X][sup 2]A[prime] transitions were detected by laser-induced fluorescence. Eight vibronic bands were observed that showed both a- and b-type transitions, indicating that the observed transitions are from the [tilde B] state, not the [tilde C] state. The quantum yield of fluorescence abruptly decreased at lines [approximately]2,770 cm[sup [minus]1] above the zero vibrational state of [tilde B], indicating the onset of a channel leading to predissociation. Rotational spectra of the lowest six vibrational levels of the [tilde B] state are analyzed.

• OSTI ID: 6956831
• Journal Information: Journal of Molecular Spectroscopy; (United States), Journal Name: Journal of Molecular Spectroscopy; (United States) Vol. 165:2; ISSN JMOSA3; ISSN 0022-2852
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500 -- Photochemistry
54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ACETALDEHYDE
ACYL RADICALS
ALDEHYDES
ATMOSPHERIC CHEMISTRY
CHEMICAL REACTIONS
CHEMISTRY
COMBUSTION
DECOMPOSITION
EMISSION SPECTROSCOPY
FLUORESCENCE
FLUORESCENCE SPECTROSCOPY
FORMYL RADICALS
HYDROCARBONS
LUMINESCENCE
ORGANIC COMPOUNDS
OXIDATION
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADICALS
SPECTROSCOPY
THERMOCHEMICAL PROCESSES