Dynamical process of optically trapped singlet ground state ${}^{85}$Rb${}^{133}$Cs molecules produced via short-range photoassociation

Abstract

We investigate the dynamical process of optically trapped X${}^1$$\hat{I}\pounds$${}^{+}$ (v" = 0) state ${}^{85}$Rb${}^{133}$Cs molecules distributing in J" = 1 and J" = 3 rotational states. The considered molecules, formed from short-range photoassociation of mixed cold atoms, are subsequently confined in a crossed optical dipole trap. Based on a phenomenological rate equation, we provide a detailed study of the dynamics of ${}^{85}$Rb${}^{133}$Cs molecules during the loading and holding processes. The inelastic collisions of ${}^{85}$Rb${}^{133}$Cs molecules in the X${}^1$$\hat{I}\pounds$${}^{+}$ (v" = 0, J" = 1 and J" = 3) states with ultracold ${}^{85}$Rb (or ${}^{133}$Cs) atoms are measured to be 1.0 (2)$\times$10${}^{-10}$ cm${}^3$s${}^{-1}$ (1.2 (3)$\times$ 10${}^{-10}$ cm${}^3$s${}^{-1}$). Our work provides a simple and generic procedure for studying the dynamical process of trapped cold molecules in the singlet ground states.

4 figures, 8 pages