Abstract
We have investigated experimentally and theoretically the spectral distribution and collisional depolarization of laser light near resonant to the Na transition 32S1/2↔32P3/2 scattered from a Na/Ar mixture in a cell (nNa≈4.0×1010cm−3,nAr≈1.0×1017cm−3). In particular, at excitation intensity of ≈3mW/mm2 and bandwidth of <10 MHz, intensityIF and linear polarization degreePF of theD2-fluorescence component of the scattered spectrum have been measured as functions of the laser detuningΔλL from theD2-resonance within two regions: 1) ¦ΔλL¦-Doppler-width; 2) 20≧¦ΔλL¦/ΔλD≧1. Within the first region the influence of hyperfine splitting as well as pumping of the hyperfine and Zeeman sublevels of 32S1/2 was studied in detail. Using an overall, total collision cross section for depolarization of 32P3/2 state atoms, calculations on the basis of the theory of redistribution reproduce qualitatively, but in a consistent manner, the experimental functionsIF(ΔλL) andPF(ΔλL). The possibility to derive differential cross sections fromPF(ΔλL) is discussed.
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