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ARTICLE IN PRESS Journal of Quantitative Spectroscopy Radiative Transfer 111 2010 1174 1183 Contents lists available at ScienceDirect Journal of Quantitative Spectroscopy Radiative Transfer journal homepage www elsevier com locate jqsrt First identi cation of the a1 Dg 2X 3 S g electric quadrupole transitions of oxygen in solar and laboratory spectra Iouli E Gordon a Samir Kassi b Alain Campargue b Geoffrey C Toon c a b c Harvard Smithsonian Center for Astrophysics Atomic and Molecular Physics Division Cambridge MA 02138 USA Universite Joseph Fourier CNRS Laboratoire de Spectrome trie Physique 38402 Saint Martin d He res France Jet Propulsion Laboratory California Institute of Technology Pasadena CA 91109 USA a r t i c l e i n f o abstract Article history Received 19 November 2009 Received in revised form 6 January 2010 Accepted 7 January 2010 16 Electric quadrupole transitions in the a1 Dg 2X 3 S O2 near 1 27 mm are g band of reported for the rst time They were rst detected in atmospheric solar spectra acquired with a ground based Fourier transform spectrometer FTS in Park Falls WI Subsequently high sensitivity CW cavity ring down spectroscopy CW CRDS experiments were carried out at Grenoble University in the 7717 7917 cm 1 region in order to provide quantitative intensity information for the electric quadrupole transitions Measured intensities were used as input data for the calculation of the complete list of electric quadrupole transitions with DJ 7 2 7 1 and 0 The calculation was carried out for the intermediate coupling case and assuming that these transitions are possible only through mixing of the O 0 component of the ground electronic state and b1 Sg state induced by spin orbit coupling The calculated line list agrees well with experimental measurements and was used to improve the residuals of the tted solar atmospheric spectrum Emission probability for the electric quadrupole band was determined to be 1 02 70 10 10 6 s 1 2010 Elsevier Ltd All rights

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