Engineering topics
Publications and source records attributed to Cosby, P. C..
A summary of our recent work using terrestrial nightglow spectra, obtained from astronomical instrumentation, to directly measure, or evaluate theoretical values for fundamental parameters of astrophysically important atomic lines.
Astronomical sky spectra, which are byproducts of long-slit observations with echelle spectrographs on large telescopes, provide a unique platform for studying the optical emissions of excited molecules and atoms in the terrestrial atmosphere that can greatly extend present knowledge based on laboratory spectra. This paper summarizes some of the advances that have been made in our understanding of the lower electronic states of O2 and other species from the sky spectra and from direct observations of the Venus nightglow.
Results are presented of measurements of the rotational and fine-structure level-specific linewidths in v = 0 and v = 2 of the O2 B3Sigma-sub-u(-) state, which were carried out using laser-induced fluorescence techniques applied to Schumann-Runge absorption transitions from vibrationally excited O2 X3Sigma-sub-g(-) system. These linewidths represent the first measurements reflecting relative predissociation rates among the B-state levels. The linewidths were found to vary considerably among the various energy levels.
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Inelastic energy losses in oxygen ion beams collisions with neutral molecules, determining vibrational transition probabilities
Energy distribution of positive Ar ions scattered from thermal diatomic D noting inelastic collisions