Abstract
The hole burning in a sodium atomic vapor in presence of argon at the pressure of 50 Torr is experimentally studied. The experimental conditions correspond to a strong collisional regime, the atomic velocity change in a single collision not being small. It is found that the hole is not destroyed by the velocity-changing collisions, but is very broad, nearly as broad as the hyperfine splitting of the 3 2 S 1 2 ground state. This suggests a low efficiency of heavy buffer gas in redistributing the atomic velocities. This hypothesis is supported by a comparison of the absorptions of the Na + Ar to the absorption of Na + He.
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