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 Author to whom correspondence should be addressed: (e-mail address):