US EPA

3074864 

Journal Article 

Photolysis of crystalline alkali nitrates via excitation of NO3- to the state of symmetry 2(1)E(1)(vertical bar) 

Miklin, MB; Ghyngazov, SA; Pak, VKh; Anan'ev, VA 

2016 

Yes 

Journal of Photochemistry and Photobiology A: Chemistry
ISSN: 1010-6030
EISSN: 1873-2666 

315 

94-97 

10.1016/j.jphotochem.2015.09.016 

WOS:000366230700012 

Photolysis of crystalline alkali nitrates has been studied using optical, IR, and EPR spectroscopy and chemical analysis of the aqueous solutions of the exposed samples. Excitation of the nitrate ion to 2(vertical bar)E(1)(vertical bar)(a(1)(vertical bar) <- e(vertical bar)) state by exposure to light with wavelength of 172 nm at 300K leads to formation of nitrite and peroxynitrite ions. The photolysis at 77K results in formation of fragment NO2, O-, and O-3(-) radicals. The quantum yields of the nitrite and peroxynitrite ions were calculated. The nitrite ions and peroxynitrite ions are formed in deep layers of the samples. The mechanism of radical formation is connected with photochemical transformations of the nitrate ion in the surface layer of the crystal. (C) 2015 Elsevier B.V. All rights reserved. 

Photo excitation; Photolysis; Nitrate; Nitrite; Peroxynitrite; Radicals