Measurement of the spectral characteristics of the 3.3912 μ (3s2-3p2 Ne) line

Measurements were made of the line width and shift of the central frequency of the 3s₂–3p₂ transition in Ne (3.3912 μ) by direct determination of the gain profile as a function of pressure, isotopic composition of the helium-neon mixture, and relative proportions of helium and neon. The shift between the centers of the lines of the Ne²⁰ and Ne²² isotopes was measured. The effective value of the Lande factor was determined. It was found that the collisional characteristics of the 3.3912μ and 3.3922μ (3s₂–3p₄ Ne) lines were identical. An estimate was obtained of the ratio of the densities of the inverted populations of the levels participating in these transitions.