science-softCon uv/vis+ spectra data base; www.uv-spectra.de; (C) science-softCon 2010 Substance: Arsenic tetramer Other Names: Formula: As4 CAS-No.: 12187-08-5 Study: photoabsorption cross sections Authors: K.P. Killeen Title: Ultraviolet absorption and photodissociation of As4 Journal/Source: J. Appl. Phys., 73, 2596, (1993); doi:10.1063/1.353076 Data: (diagram, table, disk): Energy/Wavelength range: 193.7 nm; 256.7 nm Resolution: Temperature: Temperature dependence: Pressure/Concentration: Comments: Ultraviolet absorption spectroscopy has been used to measure the photodissociative absorption band of As4 in the spectral range from 190 to 370 nm. The As4 absorption bands are assigned to 1A1-->1T1A,B Rydberg transitions with measured cross sections of 7.8±0.5×10-18 cm2 at 256.7 nm and 1.4±0.1×10-17 cm2 at 193.7 nm. Author to whom correspondence should be addressed: (e-mail address):