science-softCon uv/vis+ photochemistry database; www.photochemistry.org; (C) science-softCon 2019 Substance: nitrous acid Other Names: nitrosyl hydroxide Formula: HNO2 CAS-No.: 7782-77-6 PubChem: CID 24529 Study: UV absorption cross sections, photolysis, quantum yields Authors: R.A. Cox, R.G. Derwent Title: The ultraviolet absorption spectrum of gaseous nitrous acid Journal/Source: J. Photochem., 6, 23-24, (1976-1977); http://dx.doi.org/10.1016/0047-2670(76)87004-9 Data: table, diagram Energy/Wavelength range: 200 - 394 nm Resolution: Temperature: 295 K Temperature dependence: no Pressure/Concentration: Phase: gas pH: Comments: The ultra-violet absorption spectrum of gaseous nitrous acid was quantitatively examined over the wavelength range 200-400 nm. In addition to the diffuse bands between 310 and 380 nm previously reported in the literature, an intense, broad absorption maximum was found at 215 nm. The quantum yield of OH radical production from the photolysis of nitrous acid at 365 ± 5 nm was found to be (0.92 ± 0.16). Author to whom correspondence should be addressed: (e-mail address):