science-softCon uv/vis+ spectra data base;	www.uv-spectra.de; (C) science-softCon 2011

Substance: 1,2-butadiene			Other Names: methylallene

Formula: CH2=C=CHCH3			CAS-No.: 590-19-2

Study: photolysis, quantum yields, absorption cross sections

                
Authors: A. Hanf, H.-R. Volpp, P. Sharma, J. P. Mittal, R. K. Vatsa

Title: Ultraviolet photochemistry of buta-1,3- and buta-1,2-dienes: Laser spectroscopic absolute hydrogen atom 
quantum yield and translational energy distribution measurements

Journal/Source: J. Chem. Phys., 133, 024308, (2010); doi:10.1063/1.3462951


Data: (diagram, table, disk): 

Energy/Wavelength range: 121.6 nm

Resolution: 

Temperature: 298 K

Temperature dependence: 

Pressure/Concentration:

Phase (gas, liquid, solid):

pH:


Comments: Absolute H-atom product quantum yields of PHI(H-b13d) = (0.32±0.04) and PHI(H-b12d) = (0.36±0.04) were measured 
under collision-free conditions for the 193 nm gas-phase laser flash photolysis of buta-1,3- and buta-1,2-diene at room temperature.
In addition, values of sigma(b-1,3-d) = (3.5±0.2) x 10-17 cm2 and sigma(b-1,2-d) = (4.4±0.2) x 10-17 cm2 for the previously unknown 
Lyman-alpha (121.6 nm) radiation photoabsorption cross sections of buta-1,3- and buta-1,2-diene in the gas-phase were determined.

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