Abstract book - Prof. Per Jensen, Ph.D. - Bergische Universität ...

138 Poster session, H25New investigation on THz spectra of OH, SH and SO radicalsMarie-Aline Martin-Drumel 1,2 , Sophie Eliet 3 , Olivier Pirali 1,2 , Mickael Guinet 3 ,Francis Hindle 3 , Gaël Mouret 3 , Arnaud Cuisset 31 SOLEIL Synchrotron, AILES beamline, France, marie-aline.martin@synchrotronsoleil.fr;2 Institut des Sciences Moléculaires d’Orsay, CNRS, Université Paris XI,France; 3 Laboratoire de Physico-Chimie de l’Atmosphère, EA 4493, Université duLittoral Côte d’Opale, France, arnaud.cuisset@univ-littoral.fr;Pure rotational transitions of OH and SH radicals have been recorded in the THzspectral range using synchrotron-based FIR and cw-THz techniques. Radicals wereproduced in discharges of flowing H 2 O and H 2 S respectively. 1,2 Line lists on theseradicals have been completed in the three lowest vibrational states for OH and in thetwo lowest for SH. Furthermore, the hyperfine structure has been observed atfrequencies higher than 1 THz for both radicals.On the FT-FIR spectrum of SH, 99 new rotational transitions of SO radical have beenobserved in its vibrational ground state. Among them, 22 lines belong to the HIFIspectral windows.Martin-Drumel M.-A.Eliet S.Pirali O.Guinet M.Hindle F.Mouret G.Cuisset A.A global fit has been made for each of these radicals with the SPFIT/SPCAT programs 3providing the best set of molecular parameters for v=0, 1 and 2 for OH, v=0 and 1 forSH and v=0 for SO.Fig. 1: R 1f (1.5) pure rotational transition of the OH radical recorded usingsynchrotron-based FIR and cw-THz techniques showing resolved hyperfine structureReferences[1] S. Eliet, M. A. Martin-Drumel, M. Guinet, F. Hindle, G. Mouret, R. Bocquet, A.Cuisset, J. Mol. Struct. 1006, 13, 2011[2] M. A. Martin-Drumel, O. Pirali, D. Balcon, P. Bréchignac, P. Roy, M. Vervloet,Rev. Sci. Instrum. 82, 113106, 2011[3] H. M. Pickett, J. Mol. Spectrosc. 148, 371, 1991