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

Substance: propyne					Other names: methylacetylene

Formula: C3H4; CH3CCH					CAS-No.: 74-99-7

Study: photoabsorption cross sections


Authors: F.Z. Chen, D.L. Judge, C.Y.R. Wu

Title: Temperature Dependent Photoabsorption Cross Sections of Allene and Methylacetylene in the VUV-UV Region  

Journal/Source: Chem. Phys., 260, 215-223, (2000); http://dx.doi.org/10.1016/S0301-0104(00)00244-5


Data: table, diagram

Resolution: 0.06 nm (FWHM)

Energy/Wavelength Range: 130 nm - 220 nm

Temperature: 200 K, 295 K, 360 K

Temperature dependence: yes

Pressure/Concentration:

Phase: gas

pH:


Comments: The authors have measured the absolute photoabsorption cross sections of allene (C3H4) and methylacetylene (C3H4) in 
the respective 130-230 nm and 130-220 nm regions, with a spectral bandwidth (FWHM) of 0.06 nm and at three different temperatures, 
i.e., 360, 295, and 200 K. Significant temperature effects are observed for both molecules in the threshold absorption region. When the 
gas temperature decreases from 360 to 200 K, the apparent continuum cross sections decrease by an order of magnitude in the 230 nm 
region of allene and in the 210 nm region of methylacetylene.