LIST OF SYMBOLS The following represent the densities (cm ') of the respective materials: Br2, Br, CO2, CO2(001) = Nmil; (001) is the vibrational state; Br*, X* excited atoms M molecular absorber containing the halogen atom X T lasing medium; Yv upper, YL lower level Z cooling medium N inverted population Density ratios: a = CO2/Br2; b = He/Br2 p pressure of Br2 (Torr) C' number of times focusing mirror concentrates x number of passes through lasing medium C C'x — effective concentration of solar radiance 4>(x) solar radiance (watts per unit area per Angstrom) AX. bandwidth of absorption a cross section for absorption by molecule (cm 2) h Planck's constant k Boltzmann's constant v frequency of photon (s-1) € average energy of quanta AE, excess kinetic energy released in absorption E100 energy of CO2 in (100) state Rate coefficients: kx for Br* handing over energy to CO2(001) (cm's-1) ^2 deactivation of Br* by CO2 which ends up in levels other than the upper laser level k3 deactivation of Br* to Br by Br2 k4, k5, ke deactivation of CO2(001) by CO2, He, and Br and Br2, respectively F fraction of absorbed photons resulting in Br* F' fraction of absorbed photons contributing to heating Ac, Ar, At areas of collector, heat radiator, and subtended by laser A, unit area of cross section of laser / depth of laser Vs, Va, Vk, pQ, p solar, absorption, kinetic, quantum, and overall efficiencies r transparency of container wall e emissivity of heat radiator Q quantity of heat deposited k effective heat conductivity of mixture of gases k„ heat conductivity of nth gas X mean free path of gas molecule c mean gas particle velocity n gas density (cm 3) mn molecular weight of nth gas CVM specific heat at constant volume of nth gas S constant representing the effects of three gases on heat conductivity (Eq. 8) T gas temperature Tw wall temperature
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