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

Substance: nitrous acid					Other Names: 

Formula: HONO						CAS-No.: 7782-77-6

Study: photochemistry, UV absorption spectrum


Authors: C. Anastasio, L. Chu

Title: Photochemistry of Nitrous Acid (HONO) and Nitrous Acidium Ion (H2ONO+) in Aqueous Solution and Ice

Journal/Source: Environ. Sci. Technol., 43 (4), 1108-1114, (2009); DOI: 10.1021/es802579a


Data: table, diagram

Energy/Wavelength range: 270 - 420 nm

Resolution: 

Temperature: 274 K; 298 K

Temperature dependence: 

Pressure/Concentration:

Phase: aqueous solution, ice

pH:


Comments: Although the light absorption spectra for these two species are very similar, their photochemical efficiencies are quite 
different: the •OH (and NO) quantum yield for HONO is approximately 8 times greater than that of H2ONO+ at 274 K.
The temperature dependent expressions for the •OH (and NO) quantum yields are ln(PHI(HONO --> •OH) = (7.14 ± 0.57) - (2430 ± 160)/T 
and ln(PHI(H2ONO+ --> •OH) = (3.16 ± 0.67) - (1890 ± 180)/T.

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