Fluorescence calorimetry of an ion crystal

Abstract

Motivated by the challenge of identifying intruder ions in a cold ion crystal, we investigate calorimetry from emitted fluorescence light. Under continuous Doppler cooling, the ion crystal reaches a temperature equilibrium with a fixed level of fluorescence intensity and any change in the motional energy of the crystal results in a modification of this intensity. We theoretically determine the fluorescence rate of an ion crystal as a function of the temperature, assuming that laser light is scattered along a two-level electronic transition, which couples to the crystal's vibrations via the mechanical effects of light. We analyze how the heat dissipated by collisions of an incoming intruder ion alters the scattering rate. We argue that an energy change by an incoming ${}^{229}$Th${}^{10+}$ ion can be unambiguously detected within 100 $\mu$s via illuminating a fraction of a 10${}^3$ ion crystal. This method enables applications including capture and spectroscopy of charged states of thorium isotopes and investigation of highly charged ions.

10 pages, 4 figures

References in corpus (19)

• Direct detection of the 229Th nuclear clock transition
• Enhanced effect of temporal variation of the fine structure constant in diatomic molecules
• Employing trapped cold ions to verify the quantum Jarzynski equality
• Structural phase transitions in low-dimensional ion crystals
• Coherent laser spectroscopy of highly charged ions using quantum logic
• Lifetime measurement of the ${}^{229}$Th nuclear isomer
• Fluorescence during Doppler cooling of a single trapped atom
• The Heidelberg compact electron beam ion traps
• Light from an ion crystal: bunching or antibunching?
• Polarization-gradient cooling of 1D and 2D ion Coulomb crystals
• The Character of Motional Modes for Entanglement and Sympathetic Cooling of Mixed-Species Trapped Ion Chains
• High-precision spectroscopy of the HD+ molecule at the 1-p.p.b. level
• Imaging trapped ion structures via fluorescence cross-correlation detection
• Alpha spectrometric characterization of thin ${}^{233}$U sources for ${}^{229\text{(m)}}$Th production
• Robust Polarization Gradient Cooling of Trapped Ions
• Catching, trapping and in-situ-identification of thorium ions inside Coulomb crystals of ${}^{40}$Ca${}^{+}$ ions
• Development of a recoil ion source providing slow Th ions including ${}^{229(m)}$Th in a broad charge state distribution
• Non-destructive detection of large molecules without mass limitation
• Retrieval of single photons from solid-state quantum transducers

Cited by in corpus (1)

• Thermal bistability in laser-cooled trapped ions