Aaron T. Calvin | Searcharxiv

arXiv2017

Reassigning the CaH$^+$ 1$^{1}Σ\rightarrow$ 2$^{1}Σ$ vibronic transition with CaD$^+$

We observe vibronic transitions in CaD$^+$ between the 1$^{1}Σ$ and 2$^{1}Σ$ 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$^{-1}$.

physics.atom-ph↗

arXiv2016

Vibronic spectroscopy of sympathetically cooled CaH$^+$

We report the measurement of the 1$^{1}Σ\longrightarrow$ 2$^{1}Σ$ 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 $v'$=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 $v'$=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.

physics.atom-ph↗