15min:
HIGH-RESOLUTION SPECTROSCOPY OF NITROUS ACID (HONO) AND ITS DEUTERATED SPECIES (DONO) IN THE FAR- AND MID-INFRARED REGIONS.

A. DEHAYEM-KAMADJEU, J. ORPHAL, A. PERRIN, N. IBRAHIM, I. KLEINER AND J.-M. FLAUD, Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), CNRS and Universités Paris-7 et -12, Créteil, France.

Nitrous acid (HONO) is an important source for OH radicals in tropospheric photochemistry. Currently it is measured in the atmosphere using its ultraviolet absorption bands but it has also been detected in the mid-infrared spectral region using a tuneable diode-laser. In order to complete and extend previous laboratory work on the infrared fundamental bands of trans -HONO and cis -HONO and also of its deuterated species (DONO) we have carried out a number of new spectroscopic studies, focusing on \beginitemize emthe first high-resolution spectra of trans- and cis- HONO and -DONO in the far-infrared region (30--120 cm-1), emthe first high-resolution spectra and analysis of the nu1 bands of trans- and cis- DONO around 2600 cm-1, emnew high-resolution spectra and analysis of the Coriolis-interacting nu5 and nu6 bands of HONO around 600 cm-1. \enditemize In this talk we will present the main results and some comparisons with previous studies.