Identification of Deeply Bound Heteronuclear Molecules Using Pulsed Laser Depletion Spectroscopy

Abstract

We demonstrate that a near-dissociation photoassociation resonance can be used to create a deeply bound molecular sample of ultracold NaCs. To probe the resulting vibrational distribution of the sample, we use a new technique that can be applied to any ultracold molecular system. We utilize a tunable pulsed dye laser to produce efficient spectroscopic scans ($\sim 700$ cm${}^{-1}$ at a time) in which we observe the $1^1\hat{I}{\pounds }^{+}\to 2^1\hat{I}{\pounds }^{+}-2^3\hat{I}$ vibrational progression, as well as the dissociation limit to the Cs 6${}^2$P${}_{3/2}$ asymptote. We assign $1^1\hat{I}{\pounds }^{+}$$(\text{v}$ = 4, 5, 6, 11, 19) vibrational levels in our sample.

4 pages, 5 figures