Summary
Paramagnetic rotatory power in optically oriented sodium vapour is studied, as a function of frequency, in the neighbourhood of theD lines. We show that, by means of this Faraday effect, we can directly record the relaxation of the polarization. This effect is therefore a new, accurate technique for measuring the longitudinal relaxation timeT 1 in optical pumping experiments. Furthermore, from the measured rotatory power, the broadening and the shift of theD lines produced by the collisions with the buffer gas atoms can be obtained. The widths obtained for He and Ne as buffer gases, are, Ne (0.76±0.04) cm−1/r.d., He (0.49±0.076) cm−1/r.d. (they are found to be the same for the twoD lines).
Riassunto
Si studia il potere rotatorio del vapore di sodio orientato otticamente. Tale potere rotatorio viene misurato in funzione della frequenza nei pressi delle righeD. Si mostra come, mediante tale birifrangenza circolare del vapore orientato, sia possibile registrare direttamente il rilassamento dell’orientazione. Questo effetto fornisce quindi un nuovo ed accurato metodo per la misura del tempo di rilassamento longitudinaleT 1 di un vapore orientato. Dallo studio del potere rotatorio in funzione della frequenza è possibile avere informazioni sull’allargamento e lo spostamento delle righeD, causato dalle collisioni con il gas tampone presente nella cella in cui viene orientate il vapore di sodio. In particolare per il Ne e l’He si trovano i seguenti valori dell’allargamento specifico: Ne (0.76±0.04) cm−1/r.d.; He (0.49±0.076) cm−1/r.d. L’allargamento è uguale per entrambe le righeD 1 eD 2.
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Research supported by G.N.S.M.
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Strumia, F. Magnetic rotatory power of optically pumped Na vapour and its application to the study of longitudinal relaxation time and of buffer-gas-pressure broadening of optical lines. Nuovo Cimento B (1965-1970) 44, 387–409 (1966). https://doi.org/10.1007/BF02710815
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DOI: https://doi.org/10.1007/BF02710815