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

Substance: vinyl acetylene				Other Names: 1-buten-3-yne

Formula: CH2CHCCH					CAS-No.: 689-97-4

Study: uv absorption cross sections

                
Authors: A. Fahr, A. Nayak

Title: Temperature dependent ultraviolet absorption cross sections of propylene, methylacetylene and vinylacetylene

Journal/Source: Chem. Phys., 203, 351-358, (1996); http://dx.doi.org/10.1016/0301-0104(95)00401-7


Data: table, diagram

Energy/Wavelength range: 160 - 240 nm

Resolution: 

Temperature: 223 K, 233 K, 253 K, 273 K, 295 K, 313 K, 333 K

Temperature dependence: yes

Pressure/Concentration:

Phase: gas

pH:


Comments: The temperature dependence of the UV absorption cross sections of propylene (CH3CH=CH2) and methylacetylene 
(CH3C=CH) from 160 to 200 nm and vinylacetylene (CH2=CHC=CH) from 160 to 240 nm have been measured in the gas phase, 
for temperatures ranging from about 220 to 330 K. The spectrum of vinylacetylene consists of a very strong and structured absorption 
in the 160 to 170 nm region and strong diffuse bands between around 190 and 230 nm. The cross section values at the absorption 
peaks, determined at low temperatures, are significantly higher than those at higher temperatures. A sharp absorption feature at 168.2 nm 
shows the most pronounced temperature effect, with an increase in cross section from 35.86 × 10-18 to 63.54 × 10-18 cm2 for a 
temperature change of 333 to 223 K.

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