title: Vibronic Spectroscopy of Sympathetically Cooled CaH.
abstract: We report the measurement of the 11Σ→21Σ 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 yields results in good agreement with the observed spectral features except for the unobserved v'=0 peak. This discrepancy is attributed to an insufficient understanding of the dissociation process, and further experimental and theoretical studies are required to confirm the assignment. 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.
authors.affiliation: School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA, 30332, USA.
authors.forename: René
authors.initials: R
authors.lastname: Rugango
authors.affiliation: School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA, 30332, USA.
authors.forename: Aaron T
authors.initials: AT
authors.lastname: Calvin
authors.affiliation: School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA, 30332, USA.
authors.forename: Smitha
authors.initials: S
authors.lastname: Janardan
authors.affiliation: School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA, 30332, USA.
authors.forename: Gang
authors.initials: G
authors.lastname: Shu
authors.affiliation: School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA, 30332, USA.|Schools of Computational Science and Engineering and Physics, Georgia Institute of Technology, Atlanta, GA, 30332, USA.
authors.forename: Kenneth R
authors.identifier: http://orcid.org/0000-0001-7716-1425
authors.initials: KR
authors.lastname: Brown
keywords: cold molecules; laser cooling; molecular ions; photodissociation; vibronic spectroscopy