Visiting Scientist at SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025, USA; Department of Chemistry, The Johns Hopkins University, Remsen Hall, 3400 N Charles Street, Baltimore, MD 21218, USA
Institute of Physical Sciences and Technology, University of Maryland, College Park, MD 20742, USA; Visiting Scientist at SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025, USA
Institute of Physical Sciences and Technology, University of Maryland, College Park, MD 20742, USA; Visiting Scientist at NASA Ames Research Center, Mail Stop 245-6, Moffett Field, CA 94035, USA
Institute of Physical Sciences and Technology, University of Maryland, College Park, MD 20742, USA
Aeronomy Group, Molecular Physics Laboratory, SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025, USA