Abstract
Broadening of the sodium resonance lines by noble gases has been measured by observing fluorescence while scanning a laser across the lines. The impact-broadened Lorentzian linewidth is determined from the normalised absorption, detected as fluorescence, in the 5-20 GHz region of the line wings. Comparison with theory indicates reasonable overall agreement, but the increased precision of these measurements indicates many discrepancies of as much as 25%.
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