Precision measurement of the ionization energy and quantum defects of 39K I

Abstract

We present absolute-frequency measurements in ultracold 39K samples of the transitions from the ground state to np Rydberg states. A global nonlinear regression of the np1/2 and np3/2 term values yields an improved wave number of 35009.8139710(22)(sys)(3)(stat) cm-1 for the first ionization threshold of 39K and the quantum defects of the np1/2 and np3/2 series. In addition, we report the frequencies of selected one-photon transitions n's <- np3/2, n'd <- np3/2, n'f <- nd and n'g <- nf and two-photon transitions nf <- np determined by millimeter-wave spectroscopy. By combining the results from the laser and millimeter-wave spectroscopic experiments, we obtain improved values for the quantum defects of the s1/2, d3/2, d5/2, f and g states. For the d series, the inverted fine structure was confirmed for n >= 32. The fine-structure splitting of the f series is less than 100 kHz at n=31, significantly smaller than the hydrogenic splitting, and the fine structure of the g series is regular for n >= 30, with a fine-structure splitting compatible with the hydrogenic prediction. From the measured quantum defects of the f and g series we derive an estimate for the static dipole and quadrupole polarizabilities of the K+ ion core. Additionally, the hyperfine splitting of the 4s1/2 ground state of 39K was determined to be 461.719700(5) MHz using radio-frequency spectroscopy and Ramsey-type interferometry.

References in corpus (19)

• An Optical Lattice Clock with Accuracy and Stability at the $10^{-18}$ Level
• CODATA Recommended Values of the Fundamental Physical Constants: 2014
• Theory and applications of atomic and ionic polarizabilities
• ARC: An open-source library for calculating properties of alkali Rydberg atoms
• Tutorial: Calculation of Rydberg interaction potentials
• A search for varying fundamental constants using Hz-level frequency measurements of cold CH molecules
• Benchmarking theory with an improved measurement of the ionization and dissociation energies of H${}_2$
• Nonadiabatic QED correction to the dissociation energy of the hydrogen molecule
• Sub-Doppler laser cooling of potassium atoms
• Precision measurement of the ionization energy of Cs I
• Observation of enhanced rate coefficients in the H${}_2^{+}$ + H${}_2$ $\to$ H${}_3^{+}$ + H reaction at low collision energies
• Atomic many-body effects and Lamb shifts in alkali metals
• Realization of a Rydberg-dressed Ramsey interferometer and electrometer
• Multiple species atom source for laser-cooling experiments
• Measuring the Rydberg Constant Using Circular Rydberg Atoms in an Intensity-Modulated Optical Lattice
• Non-adiabatic mass-correction functions and rovibrational states of ${}^4$He${}_2^{+}$ ($X{}^2{\Sigma }_{\text{u}}^{+}$)
• Generation of high-purity, low-temperature samples of ${}^{39}$K for applications in metrology
• Experimental isotope shifts of the 5 ${}^2{S}_{1/2}$ state and low-lying excited states of Rb
• Measurement of the $4S_{1/2}\to 6S_{1/2}$ transition frequency in atomic potassium via direct frequency comb spectroscopy

Cited by in corpus (15)

• Survey of hyperfine structure measurements in alkali atoms
• SI-traceable frequency dissemination at 1572.06 nm in a stabilized fiber network with ring topology
• Heteronuclear long-range Rydberg molecules
• Trapped Rydberg ions: a new platform for quantum information processing
• Core polarizability of rubidium using spectroscopy of the ng to nh, ni Rydberg transitions
• Formation of ultracold ion pairs through long-range Rydberg molecules
• Quantum defects of $n$F${}_J$ levels of Cs Rydberg atoms
• Precision millimetre-wave spectroscopy and calculation of the Stark manifolds in high Rydberg states of para-H${}_2$
• Photodissociation of long-range Rydberg molecules
• EIT spectroscopy of high-lying Rydberg states in ${}^{39}K$
• Precision measurement of the ionization energy of a single trapped ${}^{40}$Ca${}^{+}$ ion by Rydberg series excitation
• Structure and electron dynamics of planetary states of Sr below the Sr${}^{+}$ $7d$ and $8p$ thresholds
• Determination of Quantum Defects and Core Polarizability of Atomic Cesium via Terahertz and Radio-Frequency Spectroscopy in Thermal Vapor
• Does the Vacuum Gravitate on Microscopic Scales? Rydberg Atoms Indicate Probably Not
• Testing ER = EPR with Hydrogen