Overtone dissociation of peroxynitric acid (HO2NO2): absorption cross sections and photolysis products

The Journal of Physical Chemistry. a
Harald StarkA R Ravishankara

Abstract

Band strengths for the second (3nuOH) and third (4nuOH) overtones of the OH stretch vibration of peroxynitric acid, HO2NO2 (PNA) in the gas-phase were measured using Cavity Ring-Down Spectroscopy (CRDS). Both OH overtone transitions show diffuse smoothly varying symmetrical absorption profiles without observable rotational structure. Integrated band strengths (base e) at 296 K were determined to be S(3nuOH) = (5.7 +/- 1.1) x 10(-20) and S(4nuOH) = (4.9 +/- 0.9) x 10(-21) cm(2) molecule(-1) cm(-1) with peak cross sections of (8.8 +/- 1.7) x 10(-22) and (7.0 +/- 1.3) x 10(-23) cm(2) molecule(-1) at 10086.0 +/- 0.2 cm(-1) and 13095.8 +/- 0.4 cm(-1), respectively, using PNA concentrations measured on line by Fourier-transform infrared and ultraviolet absorption spectroscopy. The quoted uncertainties are 2sigma (95% confidence level) and include estimated systematic errors in the measurements. OH overtone spectra measured at lower temperature, 231 K, showed a narrowing of the 3nuOH band along with an increase in its peak absorption cross section, but no change in S(3nuOH) to within the precision of the measurement (+/-9%). Measurement of a PNA action spectrum showed that HO2 is produced from second overtone photodissociation. The ac...Continue Reading

References

Apr 7, 1999·Journal of Molecular Spectroscopy·S KleeJ Flaud
Sep 16, 2004·The Journal of Chemical Physics·Jamie MatthewsJoseph S Francisco
Jul 13, 2006·The Journal of Physical Chemistry. a·Tomasz GierczakA R Ravishankara

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Citations

May 20, 2015·Physical Chemistry Chemical Physics : PCCP·Tianlei ZhangZhuqing Wang
Nov 28, 2013·Physical Chemistry Chemical Physics : PCCP·V Vaida, D J Donaldson
Jun 15, 2010·Environmental Science & Technology·D J DonaldsonVeronica Vaida
Jan 14, 2011·The Journal of Physical Chemistry. a·Israel BegashawSteven S Brown
Jun 16, 2017·The Journal of Physical Chemistry. a·Sebastian Brickel, Markus Meuwly

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