Core polarizability of rubidium using spectroscopy of the ng to nh, ni Rydberg transitions

Abstract

We present a precise measurement of the rubidium ionic core polarizability. The results can be useful for interpreting experiments such as parity violation or black-body radiation shifts in atomic clocks since the ionic core electrons contribute significantly to the total electrical polarizability of rubidium. We report a dipole polarizability ${\alpha }_d$ = $9.116\pm 0.009$ $a_0^3$ and quadrupole polarizability ${\alpha }_q$ = $38.4\pm 0.6$ $a_0^5$ derived from microwave and radio-frequency spectroscopy measurements of Rydberg states with large angular momentum. By using a relatively low principal quantum number ($17\le n\le 19$) and high angular momentum ($4\le \ell \le 6$), systematic effects are reduced compared to previous experiments. We develop an empirical approach to account for non-adiabatic corrections to the polarizability model. The corrections have less than a 1\% effect on ${\alpha }_d$ but almost double ${\alpha }_q$ from its adiabatic value, bringing it into much better agreement with theoretical values.

arXiv comment10 pages, 7 figures, 6 tables, to be submitted to physical review a

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• Measurement of Rb g-series quantum defect using two-photon microwave spectroscopy
• Quantum defects of $n$F${}_J$ levels of Cs Rydberg atoms
• Microwave spectroscopy and Zeeman effect of cesium $(n+2)D_{5/2}\to n{F}_J$ Rydberg transitions
• Determination of Quantum Defects and Core Polarizability of Atomic Cesium via Terahertz and Radio-Frequency Spectroscopy in Thermal Vapor
• Improved ionization potential of calcium using frequency-comb based Rydberg spectroscopy
• Measurement of the 87Rb D-line vector tune-out wavelength
• Gauge effects in bound-bound Rydberg-transition matrix elements
• Blackbody radiation Zeeman shift in Rydberg atoms