Spectroscopy of a Mixture of Cs and N2 in a Nanocell

Spectroscopy of a mixture of atomic cesium (Cs) and molecular nitrogen (N₂) gas in a nanocell was studied for the first time. An optical nanocell of thickness L ~ 800 nm was used to measure the broadening and shift of the Cs-atom D₂ line by gaseous nitrogen N₂ at a pressure of 400 Torr. The absorption spectra of pure cesium vapor and cesium vapor with the addition of gaseous nitrogen were measured. The measured values of the shift and broadening of the Cs D₂ lines in the presence of N₂ were –7 ± 1 and 15 ± 0.7 MHz/Torr. The results were in good agreement with the values given in the literature.