The absorption spectrum of NaNa from 350 to 1075 nm

Effect of argon buffer gas and the dimer component on the optical properties of sodium vapor

“…1a and b, the substantial absorption occurring in the red region of the spectrum of the system under consideration can be explained by intrinsic transitions in the spectrum of argon which were neglected before. This is also consistent with experimental results in [6,7], in which it was noted that the absorption disappears in the absence of buffer gas, strongly depends on its pressure in the cuvet, and also proves to be considerably greater for argon than for helium. Conclusion.…”

“…We took into account the effect on the absorption spectrum of the system from intrinsic transitions of argon (the buffer gas) lying in the 700-1000 nm interval. We have shown that strong optical losses in the red region (the "unexpected" losses) are partially due to specifically the broadened lines of atomic argon, which is consistent with the previously observed patterns in the behavior of the system as a function of the type of buffer gas and its parameters [6,7].…”

“…We should point out that available papers neglect the effect of intrinsic absorption peaks of the buffer gas on the resulting optical properties of the system. The authors of [7] noted the disappearance of absorption in the red region when the buffer gas was removed (argon in this case), in the spectrum of which the strongest transitions are located specifically in the range 700-1000 nm. The experimental data presented in [6] suggest that the pressure and type of buffer gas have a quite strong effect on the optical properties of the studied medium: absorption increases as the buffer gas pressure increases, and proves to be significantly greater for argon than for helium.…”

Precision measurements of sodium-sodium and sodium-noble gas molecular absorption

“…The absorption coefficient in the 425 nm to 760 nm range consists of contributions from the broadened sodium atomic lines around 589 nm, the sodium -noble gas and the sodium -sodium molecular spectra. From 460 nm to about 550 nm a blue wing of the sodium dimer absorption is apparent [5]. At 560 nm there appears a sodium-xenon blue wing satellite feature [6] and towards the longer wavelength of the significantly broadened sodium D-lines there are red wings of the sodium dimer [5] and the sodium-xenon molecules [6].…”

“…From 460 nm to about 550 nm a blue wing of the sodium dimer absorption is apparent [5]. At 560 nm there appears a sodium-xenon blue wing satellite feature [6] and towards the longer wavelength of the significantly broadened sodium D-lines there are red wings of the sodium dimer [5] and the sodium-xenon molecules [6]. Fig 6 shows a spectrum of the absolute absorption coefficient of a sodium -argon mixture measured at 900K +10K −50K cell temperature.…”