FOURIER TRANSFORM FAR-INFRARED SPECTROSCOPY OF HN$_2^+$ ON THE AILES BEAMLINE OF SYNCHROTRON SOLEIL
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Date
2013
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Ohio State University
Abstract
We report the pure rotation spectrum of HN$_2^+$ 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 H$_3^+$($\nu_2$ band centered at 2521 cm$^{-1}$), HN$_2^+$ ($\nu_1$ band centered at 3234 cm$^{-1}$) and HCO$^+$($\nu_1$ 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 HN$_2^+$. 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).
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Author Institution: Ligne AILES, Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin, 91192 Gif sur Yvette Cedex - France