Reassigning the CaH${}^{+}$ 1${}^1\Sigma \to$ 2${}^1\Sigma$ vibronic transition with CaD${}^{+}$

Abstract

We observe vibronic transitions in CaD${}^{+}$ between the 1${}^1\Sigma$ and 2${}^1\Sigma$ electronic states by resonance enhanced multiphoton photodissociation spectroscopy in a Coulomb crystal. The vibronic transitions are compared with previous measurements on CaH${}^{+}$. The result is a revised assignment of the CaH${}^{+}$ vibronic levels and a disagreement with CASPT2 theoretical calculations by approximately 700 cm${}^{-1}$.

4 pages, 4 figures, comments welcome