science-softCon uv/vis spectra data base;	www.uv-spectra.de; (C) science-softCon 2008

Substance: 2,3-butanedione			Other Names: biacetyl; glyoxal, dimethyl-

Formula: 	C4H6O2				CAS-No.: 431-03-8

Study: photolysis, quantum yields


Authors: W. E. Bell, F. E. Blacet

Title: The Photolysis of Biacetyl

Journal: J. Am. Chem. Soc., 76, 5332-5337, (1954); DOI: 10.1021/ja01650a019


Data: (diagram, table, disk): table

Wavelenght range: 238 - 313 nm

Resolution: 

Temperature: 

Temperature dependence: 

Pressure: 


Comments: The vapor phase photochemical decomposition of biacetyl has been studied over a wide range of temperature, wavelength,
concentration and light intensity. Quantum yields are reported for the products, carbon monoxide, ethane, methane and acetone.
The first absorption region of biacetyl extends from about 4600 to 3500 A, and the second from 3200 to below 2200 A.
Primary quantum yields:
Wavelength	PHI
238.0	0.25
253.7	0.33
265.4	0.39
280.4	0.27
313.0	0.074

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