Orientation-resolved imaging of rotational superposition states in ultracold LiRb

We present work toward coherent detection and imaging of rotational superposition states in ultracold lithium-rubidium. Starting from $X \ ^1\Sigma^+ v = 43$, $J = 0$, populated by photoassociation in a dual species MOT, we apply a RF pulse to form a $J = 0/J = 1$ superposition state. The molecules are ionized by a frequency comb source whose repetition rate is phase coherent with the RF field. We present spectra highlighting a 3-photon doubly-resonant ionizing transition starting from $X \ ^1\Sigma^+ v = 43$, $J = 0$ and $X \ ^1\Sigma^+ v = 43$, $J = 1$ as well as preliminary results toward orientation-resolved imaging of the superposition state.