Speaker
Description
We report the results of theoretical studies for the dependence of collisional shift and width on isotopic mass in a Hg 1S0-3P0 clock transition perturbed by Rb atoms.
Our theoretical analysis uncovers isotopic dependencies over a temperature range from µK to K, highlighting specific isotope pairs with minimal collisional effects, making them well-suited for two-species Rb-Hg composite atomic clock.
In this context, we explore the isotopic dependence of collisional line shape parameters, specifically the widths and shifts of the Hg clock transition, as influenced by Rb atoms within the temperature range up to 1K. To perform these calculations, we employed the Born-Oppenheimer effective interaction potential, incorporating the dominant long-range van der Waals terms. Our analysis reveals the relationship between the collisional line shape parameters and the reduced mass of the interacting atoms, as well as the variation of the scattering length in both the ground and excited states of the Hg-Rb system. Furthermore, we compare full quantum scattering calculations with a semiclassical approximation for collisional parameters.
