Molecular ion trap-depletion spectroscopy of BaCl${}^{+}$

Abstract

We demonstrate a simple technique for molecular ion spectroscopy. BaCl${}^{+}$ molecular ions are trapped in a linear Paul trap in the presence of a room-temperature He buffer gas and photodissociated by driving an electronic transition from the ground X${}^1{\Sigma }^{+}$ state to the repulsive wall of the A${}^1\Pi$ state. The photodissociation spectrum is recorded by monitoring the induced trap loss of BaCl${}^{+}$ ions as a function of excitation wavelength. Accurate molecular potentials and spectroscopic constants are determined. Comparison of the theoretical photodissociation cross-sections with the measurement shows excellent agreement. This study represents the first spectroscopic data for BaCl${}^{+}$ and an important step towards the production of ultracold ground-state molecular ions.

5 pages, 5 figures

References in corpus (2)

• Enhanced sensitivity to variation of the fine structure constant and m_p/m_e in diatomic molecules
• A new method for producing ultracold molecular ions

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