On Argon-Induced Pressure Shifts of¹⁹⁸Hg Spectral Lines Associated with Quasi-Rydberg Transitions

Abstract

The extended Omont-Kaulakys-Ueda treatment of collisional effects on quasi-Rydberg states, in which the perturbation of the lower state is taken into account, is applied to mercury-argon system. The pressure shift coefficients of 6p-ns and 6p-nd spectral lines are calculated and compared with available experimental data.

Absolute frequency measurement of rubidium 5S–7S two-photon transitions

“…Our Rb cell has been filled under vacuum of the order of 10 −8 Torr but we assume it could drop to about 10 −4 Torr because of the cell ageing. The Rb-Ar collisional shift was estimated assuming van der Waals interaction [9] and verified with data in Ref. [10].…”

“…Our Rb cell has been filled under vacuum of the order of 10 −8 Torr; however, we assume it could drop to about 10 −4 Torr due to cell ageing. The Rb-Ar collisional shift was estimated assuming van der Waals interactions [12] and verified with data in [13]. Figure 5(b) depicts the determination of the quadratic Zeeman shift coefficient measured by application of an external, calibrated magnetic field.…”