O. PIRALI, S. GRUE, M. VERVLOET, Ligne AILES, Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin, 91192 Gif sur Yvette Cedex - France.
We report the pure rotation spectrum of HN2+ measured by Fourier Transform (FT) absorption spectroscopy in the 20-40 cm-1 spectral range. The cations are produced in a liquid nitrogen cooled hollow cathode discharge cell developed on the AILES beamline of synchrotron SOLEIL. The set-up was optimized by recording rotation-vibration spectra of H3+( 2 band centered at 2521 cm-1), HN2+ ( 1 band centered at 3234 cm-1) and HCO+( 1 band centered at 3089 cm-1). Many rotation-vibration lines have been assigned for each ion and 5 pure rotational transitions have been detected for HN2+. These results demonstrate the feasibility to record far-infrared (far-IR) spectra of cationic species using FT broad band spectroscopy associated to the bright synchrotron radiation continuum as an alternative to laser-based frequency tunable techniques. In the presentation, we will describe the experimental set-up, the results obtained and the perspectives of this preliminary work which will rely on the exploitation of intense Coherent Synchrotron Radiation (CSR).