Measurement of the broadening of the sodium resonance lines by helium

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Abstract
A nitrogen-pumped, tunable dye laser has been used to excite Na D-line fluorescence in a re-entrant scattering cell (maintained at 500 K) filled with He at pressures up to 300 Torr. The laser was scanned across the D lines, broadened in collisions with He atoms. The intensity of the resonantly scattered light was recorded at right angles to the laser beam since, in this direction, the absorption coefficient was independent of the laser intensity. D-line profiles obtained in this fashion were then analyzed to obtain collision-broadening coefficients. These coefficients of values 2.4 ± 0.3 and 2.8 ± 0.4 (in units of 10−9 rad s−1 cm3), for the D1 and D2 lines respectively, are compared with recent measurements at high and low temperatures and with several quantum mechanical calculations.

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