Naslov
New Analysis of the nu_3 and nu_4 Bands of HNO_3 by High Resolution Fourier-Transform Infrared Spectra in the 7.6 mum Region: Line Positions and Line Intensities

Autori
Perrin, Agnes ; Orphal, Johannes ; Flaud, Jean-Marie ; Miljanić, Snežana ; Klee, Stefan ; Mellau, Georg C. ; Goldman, Aharon

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Abstract Book of the 62nd OSU International Symposium on Molecular Spectroscopy / Miller, Terry A. - Columbus (OH) : The Ohio State University, 2007

Skup
62nd OSU International Symposium on Molecular Spectroscopy

Mjesto i datum
Columbus (OH), Sjedinjene Američke Države, 18.06.2007. - 22.06.2007

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Atmosphere; Fourier transform infrared spectrum; High-resolution molecular spectroscopy; Nitric acid; Line positions; Line intensities

Sažetak
Nitric acid (HNO_3) plays an important role in the Earth's atmosphere as a reservoir molecule of NO_x species. This molecule has a strong infrared signature at 7.6 mum which is one of the most commonly used for the infrared retrieval of HNO_3 in the atmosphere together with the 11 mum one. It is therefore essential to have the best possible spectral parameters in this spectral region. The goal of this work was to get better line positions and intensities for the nu_4 and nu_3 interacting cold bands located at 1303.071 and 1326.182 cm_-1 respectively as compared to those obtained few years ago: in fact, only the total band intensity was re-sclaled during the recent update in the HITRAN database, HNO_3 line list at 7.6 mum region. For this purpose a large set of new high resolution FTS spectra recorded in Giessen and in Denver were analysed. For the line positions and line intensities calculation, the theoretical model accounts for the vibration-resonances which link the energy levels of the 4^1and 3^1 bright vibrational states together with those of several dark interacting states (9^3 for example, among others). Very preliminary results will be presented.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija

POVEZANOST RADA