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A further example in Sec. VIII uses the modified Newtonian theory technique to investigate the static stability of the Apollo Command Module. Using tunnel results from 0 = 0 and 9 = 30°o nly, the static stability conditions of the module are derived and are found to be close to those obtained using the full range of experimental results. The electron beam fluorescence technique has been used to determine the velocity distribution function within several mean free paths of the leading edge in a rarefied hypersonic helium flow. The Doppler shift and broadening of the 5016 A He line was measured with a computer controlled Fabry-Perot interferometer. For analysis, the velocity distribution function was approximated with a bimodal model consisting of two Gaussian functions, which was convoluted with the appropriate instrument function and natural line profile and then fitted to the experimental data. Macroscopic properties in the vicinity of the leading edge, slip velocities, and temperature jumps have been obtained from the complete velocity distribution functions. Nomenclature A = height of distribution function c -speed of light D = orifice diameter H = enthalpy k = Boltzmann constant Presented as Paper 73-691 at 1 P -2 1 S transition M = Mach number M (A, T) = Maxwellian distribution function m = mass flow m = atomic mass of helium n = weighting of distribution function p = pressure R = gas constant S -speed ratio 5(1) = spectral profile T = temperature u = particle velocity U = mean velocity AC/ =U,-U 2 x = axial distance from leading edge y = height above flat plate z = direction normal to flow in plane of plate surface a = energy accommodation coefficient ft = bevel angle = mean free path = wavelength A 0 = He 5016 A wavelength AA = deviation A -/ 0 r\ = coefficient fj. = viscosity p = density a = tangential momentum accommodation coefficient Downloaded by UNIVERSITY OF MICHIGAN on February 3, 2015 | http://arc.aiaa.org |

We report the successful application of an optically pumped molecular beam laser for efficient and selective population transfer from v″=0 to high lying vibrational levels of Na2 in the electronic ground state. More than 50% of the molecules in a thermally populated rotational level of v″=0 can be transferred to a state v″≫1 with typically ≥75% of the molecules excited out of the initial state found in the predetermined end vibrational level and approximately ≤25% distributed over other levels according to the Franck–Condon factors. The applicability of this technique to the study of collision processes involving vibrationally highly excited levels is discussed. This work also contributes in general to a better understanding of optically pumped dimer lasers.

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