Precise Determination of Excited State Rotational Constants and Black-Body Thermometry in Coulomb Crystals of Ca${}^{+}$ and CaH${}^{+}$

Abstract

We present high-resolution rovibronic spectroscopy of calcium monohydride molecular ions (CaH${}^{+}$) co-trapped in a Coulomb crystal with calcium ions (${}^{40}$Ca${}^{+}$), focusing on rotational transitions in the $|X^1{\Sigma }^{+},\nu "=0>\to |A^1{\Sigma }^{+},{\nu }^{\prime }=2>$ manifold. By resolving individual P and R branch transitions with record precision and using Fortrat analysis, we extract key spectroscopic constants for the excited state $|A^1{\Sigma }^{+},{\nu }^{\prime }=2>$, specifically, the band origin, the rotational constant, and the centrifugal correction. Additionally, we demonstrate the application of high-resolution rotational spectroscopy of CaH${}^{+}$ presented here as an in-situ probe of local environmental temperature. We correlate the relative amplitudes of the observed transitions to the underlying thermalized ground-state rotational population distribution and extract the black-body radiation (BBR) temperature.

References in corpus (25)

• Search for New Physics with Atoms and Molecules
• A new bound on the electron's electric dipole moment
• Preparation and coherent manipulation of pure quantum states of a single molecular ion
• Non-destructive state detection for quantum logic spectroscopy of molecular ions
• Millikelvin Reactive Collisions between Sympathetically-Cooled Molecular Ions and Laser-Cooled Atoms in an Ion-Atom Hybrid Trap
• Proton-Electron Mass Ratio from Laser Spectroscopy of HD${}^{+}$ at the Part-Per-Trillion Level
• An atomic clock with $1\times 10^{-18}$ room-temperature blackbody Stark uncertainty
• Broadband optical cooling of molecular rotors from room temperature to the ground state
• Quantum entanglement between an atom and a molecule
• Proton-electron mass ratio by high-resolution optical spectroscopy of ion ensembles in the resolved-carrier regime
• Quantum non-demolition state detection and spectroscopy of single trapped molecules
• Precision frequency-comb terahertz spectroscopy on pure quantum states of a single molecular ion
• A new method for producing ultracold molecular ions
• Leak-out Spectroscopy, a universal method of action spectroscopy in cold ion traps
• The rotational temperature of polar molecular ions in Coulomb crystals
• Quantum Blackbody Thermometry
• Sympathetic cooling of molecular ion motion to the ground state
• Precision measurements with polar molecules: the role of the black body radiation
• Observation of vibrational overtones by single molecule resonant photodissociation
• Modular Software for Real-Time Quantum Control Systems
• A hybrid ion-atom trap with integrated high resolution mass spectrometer
• Vibronic spectroscopy of sympathetically cooled CaH${}^{+}$
• Quantum state tracking and control of a single molecular ion in a thermal environment
• Functional Simulation of Real-Time Quantum Control Software
• Photodissociation spectra of single trapped CaOH+ molecular ions

Cited by in corpus (2)

• High-fidelity quantum state control of a polar molecular ion in a cryogenic environment
• Charge Exchange Dynamics in Cold Collisions of ${}^{40}$CaH${}^{+}$ and ${}^{39}$K