Физика Низких Температур: Том 27, Выпуск 9-10 (Сентябрь 2001), c. 1202-1207    ( к оглавлению , назад )

Ionization and hydrolysis of dinitrogen pentoxide in low-temperature solids

J. Agreiter, M. Frankowski*, and V. E. Bondybey

Institute for Physical and Theoretical Chemistry, Technical University of Munich Lichtenbergstrasse 4, 85747 Garching, Germany
E-mail: bondybey@uci.edu

Received June 21, 2001


Solid layers of interest for the chemistry of polar stratospheric clouds were investigated. Mixtures of covalent N2O5 and water in various molar ratios are deposited from vapor phase on a cold 12 K substrate. By repeatedly recording Fourier transform infrared spectra of the samples during gradual warm up to 200 K over a period of several hours the hydrolysis process can be followed. At each concentration the process is found to proceed in several distinct steps with sharp temperature thresholds. In samples containing only small amounts of water the covalent N2O5 is first around 110 K converted to an ionic nitronium nitrate, and only in a subsequent step NO2+NO3- reacts to nitric acid.

78.30.-j - Infrared and Raman spectra (for vibrational states in crystals and disordered systems, see 63.20.-e and 63.50.+x respectively)