Pressure effects of He and Xe on the resonance line of strontium

The effects of He pressure (up to a relative density or r.d. of 60) and those of Xe pressure (up to r.d. 13) on the shape of the Sr 4607 or Sr(1) line are reported. The half-width and shift in low foreign gas density region (less than 10 atm) are found to be reasonably linear with He. The linear region for Sr(1)/Xe is highly limited. In He, the line contours are quite symmetrical but in Xe the line contours show very strong red asymmetry. Assuming a Lenard-Jones (6–12) form for the interactomic potentials, the depths of the difference potential well were found via the classical impact theory. These values are 0.86 cm^?1 for Sr(1)/He at an interatomic distance of 7.35 Å and 2.51 cm^?1 for Sr(1)/Xe at 12.83 Å.