science-softCon uv/vis+ photochemistry database;	www.photochemistry.org; (C) science-softcon 2019

Substance: glyoxal					Other Names: ethanedial

Formula: C2H2O2; (CHO)2					CAS-No.: 107-22-2

Study: photolysis; quantum yields


Authors: J. Tadic, G.K. Moortgat, K. Wirtz

Title: Photolysis of glyoxal in air

Journal/Source: J. Photochem. Photobiol. A: Chem., 177, 116-124, (2006); doi:10.1016/j.jphotochem.2005.10.010  


Data: 

Energy/Wavelength range: 275 - 470 nm

Resolution: 

Temperature: 298 K

Temperature dependence: no

Pressure/Concentration: 100 - 700 Torr (total pressure, synthetic air)

Phase: gas

pH:


Comments: Photolysis in the first absorption band of glyoxal, using TL/12 lamps (275-380 nm), provided an overall quantum yield of PHI(T) = 0.97 ± 0.05, independent 
of total pressure ranging from 100 to 700 Torr air. The absolute quantum yields obtained with the TL/03 lamps (390-470 nm), covering the second absorption 
band of glyoxal, showed dependency on total pressure, ranging from PHI(T) = 0.12 at 100 Torr to PHI(T) = 0.042 at 700 Torr,


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