science-softCon uv/vis+ photochemistry database; www.photochemistry.org; (C) science-softCon 2019 Substance: nitrogen trioxide Other Names: Formula: NO3 CAS-No.: 12033-49-7 Study: Vis absorption cross sections Authors: S.P. Sander Title: Temperature Dependence of the NO3 Absorption Spectrum Journal/Source: J. Phys. Chem., 90, 4135-4142, (1986); DOI: 10.1021/j100408a060 Data: table, diagram Energy/Wavelength range: 400 - 690 nm Resolution: Temperature: 230 K; 298 K Temperature dependence: yes Pressure/Concentration: Phase: gas pH: Comments: The absorption spectrum of the gas-phase NO3 radical has been studied between 220 and 700 nm. Flash photolysis experiments: The NO3 cross section at 661.9 nm was determined to be (2.28 ± 0.34) x 10-17 cm2/molecule at 298 K. Measurements at 230 K indicated that the cross section increases by a factor of 1.18 at the peak of the (0,0) band. Discharge flow experiments: This method was used both to obtain absolute cross sections at 661.9 nm and to obtain relative absorption spectra between 300 and 700 nm at 298 K and 230 K. A value of (1.83 ± 0.27) x 10-17 cm2/molecule was obtained for sigma(NO3) at 298 K. Author to whom correspondence should be addressed: (e-mail address):