Physics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phdt........83s&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF WASHINGTON, 1990.Source: Dissertation Abstracts International, Volume: 51-04, Section: B, page: 18
Physics
Vibrational Transfer
Scientific paper
A series of experiments were carried out to demonstrate the feasibility of pumping carbon monoxide with blackbody radiation. The properties of CO as radiation absorber and vibrational energy storage were studied. The vibrational temperature of the first excited state of CO was measured by means of the line reversal technique, at stations downstream of a blackbody pumping region. Mixtures of CO-Ar and CO -N_2 were tested. The feasibility of pumping CO with blackbody radiation at pressures of the order of one atmosphere was demonstrated. The energy storage times were improved by means of reflective containers. Decay times up to.4 sec were measured for CO-N_2 mixtures in such arrangement. A model including radiative pumping and trapping, interspecies V-V transfer, V-T quenching, diffusion, wall deactivation, and convective transport was developed. Data analysis through this model yielded fundamental kinetic rates for CO-Ar and CO-CO collisions. The spatial dependence of the radiative pumping was measured. It was concluded that it is possible to use large diameter pumping tubes (i.e 10 cm. diameter) based on these measurements. A model including interlevel V-V transfer in CO allowed evaluation of the vibrational population distribution, as well as lasing parameters. Output powers densities of the order of 1/3 watt/cm^3 and lasing efficiencies of the order of 50% are predicted for mixtures at 1 atm. gas pressure being pumped with 2500^circ K blackbody radiation. Such power densities and pressures represent an improvement of two orders of magnitude over carbon dioxide mixtures previously studied.
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