dc.creator Pirali, O. en_US dc.creator Martin, M.-A. en_US dc.creator Vervloet, M. en_US dc.creator Balcon, D. en_US dc.creator Yu, S. en_US dc.creator Pearson, J. en_US dc.creator Drouin, B. en_US dc.creator Endres, C. P. en_US dc.creator Shiraishi, T. en_US dc.creator Kobayashi, K. en_US dc.creator Matsushima, F. en_US dc.date.accessioned 2010-07-12T14:23:42Z dc.date.available 2010-07-12T14:23:42Z dc.date.issued 2010 en_US dc.identifier 2010-FC-04 en_US dc.identifier.uri http://hdl.handle.net/1811/46353 dc.description Author Institution: Ligne AILES--Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin, 91192 Gif-sur-Yvette, France; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA; I. Physikalisches Institut, Universitat zu Koln, 50937 Koln, Germany; Department of Physics, University of Toyama, Gofuku, Toyama 930-8555, Japan en_US dc.description.abstract Since its first detection in 1968, ammonia was discovered as a major constituent of several planetary atmospheres. More recently, ammonia has been suggested in the atmosphere of cool brown dwarf and is expected to be present in quantity in the atmospheres of many newly discovered exoplanets and brown dwarf stars where temperatures are in the order of 1000 K . For such temperatures, spectroscopic knowledge of ammonia's IR spectrum needs to be improved both in term of line positions and intensities. Even for the two lowest vibrational levels (ground state and $v_2 = 1$) its large amplitude inversion motion complicates the spectral modelling and the experimental dataset have been (up to now) limited to low quantum numbers (J of about 20). We associated experimental results obtained from far infrared techniques and terahertz spectroscopy to obtain accurate energies for highly excited J levels (as high as J=35) in the ground state and $v_2 = 1$. This work significantly increases the experimental dataset available to support astronomical observations; we will present the techniques developed in this work as well as the spectral analysis and fit of the new dataset. en_US dc.language.iso en en_US dc.publisher Ohio State University en_US dc.title TERAHERTZ AND FAR-INFRARED SPECTROSCOPY OF HIGH-J TRANSITIONS OF THE GROUND AND $v_2 = 1$ STATES OF NH$_3$ en_US dc.type Article en_US dc.type Image en_US dc.type Presentation en_US
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