Vibronic spectroscopy of sympathetically cooled CaH${}^{+}$

Abstract

We report the measurement of the 1${}^1\Sigma ⟶$ 2${}^1\Sigma$ transition of CaH${}^{+}$ by resonance-enhanced photodissociation of CaH${}^{+}$ that is co-trapped with laser-cooled Ca${}^{+}$ . We observe four resonances that we assign to transitions from the vibrational $v$=0 ground state to the $v^{\prime }$=1-4 excited states based on theoretical predictions. A simple theoretical model that assumes instantaneous dissociation after resonant excitation yield results in good agreement with the observed spectral features except for the unobserved $v^{\prime }$=0 peak. The resolution of our experiment is limited by the mode-locked excitation laser, but this survey spectroscopy enables future rotationally resolved studies with applications in astrochemistry and precision measurement.

pre-peer-reviewed version of R. Rugango et al. ChemPhysChem, (Early online see DOI) (2016). Peer-reviewed version will be arxived after the embargo period

References in corpus (3)

• Efficient sympathetic motional ground-state cooling of a molecular ion
• The static and dynamic polarisability, and the Stark and black-body radiation frequency shifts of the molecular hydrogen ions H2+, HD+, and D2+
• Sympathetic cooling of molecular ion motion to the ground state

Cited by in corpus (3)

• Increase of barium ion-trap lifetime via photodissociation
• Photodissociation spectra of single trapped CaOH+ molecular ions
• Precise Determination of Excited State Rotational Constants and Black-Body Thermometry in Coulomb Crystals of Ca${}^{+}$ and CaH${}^{+}$