Institution: | (1) Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado, U.S.A.;(2) Joint Institute for Laboratory Astrophysics of the National Bureau of Standards, Boulder, Colorado, U.S.A.;(3) University of Colorado, Boulder, Colorado, U.S.A.;(4) Present address: Quantum Physics Division, National Bureau of Standards, Boulder, Colorado, U.S.A. |