science-softCon uv/vis+ photochemistry database; www.photochemistry.org; (C) science-softCon 2019 Substance: cis-2-butene Other Names: 2-butene, (Z)- Formula: C4H8 CAS-No.: 590-18-1 Study: UV absorption cross sections Authors: R.I. Schoen Title: Absorption, Ionization, and Ion-Fragmentation Cross Sections of Hydrocarbon Vapors under Vacuum-Ultraviolet Radiation Journal/Source: J. Chem. Phys., 37, 2032-2041, (1962); http://dx.doi.org/10.1063/1.1733423 Data: diagram, table EnergyWavelength range: ~ 50 - 137 nm (9 - 25 eV) Resolution: Temperature: 298 K Temperature dependence: no Pressure/Concentration: Phase: vapor pH: Comments: Absorption and ionization cross sections of the hydrocarbon vapors ethane, propane, n-butane, n-pentane, cyclopropane, ethylene, propylene, cis-butene-2, and 1,3-butadiene were measured in the spectral range 9 to 25 eV. With the exceptions of ethylene and cyclopropane, the absorption cross sections rose smoothly to peaks near 16 eV and decreased smoothly toward higher energy. The maximum absorption cross section of an alkane could be estimated by multiplying the number of bonding electrons by 6 Mb. Author to whom correspondence should be addressed: (e-mail address):