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NRC Postdoctoral Openings Up to two National Research Council Associate positions are available at the Air Force Research Laboratory at Hanscom Air Force Base, 15 miles northwest of Boston, Massachusetts. We perform laboratory research to better understand the chemistry and physics of the upper atmosphere. The research is conducted in an academic style and results are published in the open literature. U.S. citizenship is required for these positions, and applicants should be either soon-to-be or recent (past five years) PhD's. A modest-length proposal, written with input from an AFRL staff member, is due 15 Aug 2000 together with supporting documents. The position is nominally for one year, although it is typically extended to two years contingent on mutual agreement. Salary is about $45,000/year. See http://national-academies.org/rap <http://national-academies.org/rap> for further details. We encourage submissions from motivated individuals, including those who wish to broaden their experimental knowledge base. Please contact the appropriate scientist (see below) for further information. Position 1: Experiments in the COCHISE (COld CHemical Infrared Simulation Experiment) facility will be pursued, specifically the spectroscopy and kinetics of excited nitrogen atom collisions with oxygen molecules [fast N + O2 --> NO(v, high J) + O]. The details of the very highly rotationally excited product states of NO will be investigated as a function of precursor state. Metastable species will be monitored using spectrometric and interferometric detection of visible and IR emissions. Please contact Dr. Steve Miller at 781.377.2807 or [log in to unmask] <mailto:[log in to unmask]> for further information. Position 2: Experiments in the laser laboratory investigating energy transfer in key aeronomic processes will be pursued. Notably, these include vibrational energy transfer in collisions of NO and CO2 with oxygen atoms. Techniques such as laser-induced fluorescence, transient diode laser absorption, and time-resolved Michelson interferometry will be used to detect the relevant species. Complex spectral and kinetic models will be developed to analyze and interpret the resultant data. Please contact Dr. Jim Dodd at 781.377.4190 or [log in to unmask] <mailto:[log in to unmask]> for further information.