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

Substance: iodine nitrate				Other Names: 

Formula: IONO2						CAS-No.: 14696-81-2

Study: uv/vis spectrum, quantum yield


Authors: D.M. Joseph, S.H. Ashworth, J.M.C. Plane

Title: On the photochemistry of IONO2: absorption cross section (240–370 nm) and photolysis product yields at 248 nm

Journal/Source: Phys. Chem. Chem. Phys., 9, 5599-5607, (2007); DOI: 10.1039/b709465e


Data: table, diagram

Energy/Wavelength range: 240 - 370 nm

Resolution: ~ 0.2 - 0.4 nm (30 cm-1)

Temperature: 296 K

Temperature dependence: no

Pressure/Concentration:

Phase:

pH:


Comments: The absolute absorption cross section of IONO2 was measured by the pulsed photolysis at 193 nm of a NO2/CF3I mixture, 
followed by time-resolved Fourier transform spectroscopy in the near-UV. The resulting cross section at a temperature of 296 K over the 
wavelength range from 240 to 370 nm is given by:
log10(sigma(IONO2)/cm2 molecule-1) = 170.4 - 3.773 lambda + 2.965 × 10-2lambda2 - 1.139 × 10-4lambda3 + 2.144 × 10-7lambda4 - 1.587 × 10-10lambda5, 
where lambda is in nm; the cross section, with 2sigma uncertainty, ranges from (6.5 ± 1.9) × 10-18 cm2 at 240 nm to (5 ± 3) × 10-19 cm2 at 350 nm, 
and is significantly lower than a previous measurement [J. C. Mössinger, D. M. Rowley and R. A. Cox, Atmos. Chem. Phys., 2002, 2, 227].

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