Frequency measurements of transitions from the $2^3{P}_2$ state to the $5^1{D}_2$, $5^3{S}_1$, and $5^{3}D$ states in ultracold helium

Abstract

We perform laser absorption spectroscopy with ultracold ${}^4$He atoms to measure the energy intervals between the $2^3{P}_2$ level and five levels in the n = 5 manifold. The laser light perturbs the cold atomic cloud during the production of Bose-Einstein condensates and decreases the phase space density, causing a measurable decrease in the number of atoms in the final condensate. We improve on the precision of previous measurements by at least an order of magnitude, and report the first observation of the spin-forbidden $2^3{P}_2-5^1{D}_2$ transition in helium. Theoretical transition energies agree with the observed values within our experimental uncertainty.

arXiv comment7 pages, 6 figures

References in corpus (20)

• New measurement of the $1S-3S$ transition frequency of hydrogen: contribution to the proton charge radius puzzle
• Frequency metrology in quantum degenerate helium: Direct measurement of the 2 3S1 - 2 1S0 transition
• Fine structure of helium-like ions and determination of the fine structure constant
• Testing fundamental interactions on the helium atom
• A Determination of the Fine Structure Constant using Precision Measurements of Helium Fine Structure
• Precision spectroscopy of helium in a magic wavelength optical dipole trap
• Forbidden transitions in the helium atom
• Widely tunable, narrow linewidth external-cavity gain chip laser for spectroscopy between 1.0 - 1.1 um
• Higher-order recoil corrections for triplet states of the helium atom
• Ultrahigh-precision measurement of the $n=2$ triplet P fine structure of atomic helium using frequency-offset separated oscillatory fields
• Higher-order recoil corrections for singlet states of the helium atom
• High-precision spectroscopy of the forbidden 2 3S1 - 2 1P1 transition in quantum degenerate metastable helium
• Deuteron charge radius from the Lamb-shift measurement in muonic deuterium
• Helium fine structure theory for determination of α
• Comparison of spectral linewidths for quantum degenerate bosons and fermions
• QED calculation of ionization energies of $1snd$ states in helium
• Bogoliubov-Cherenkov Radiation in an Atom Laser
• Quantum electrodynamic corrections to the $1s3d$ states of the helium atom
• Direct Measurement of the Forbidden $2^3{S}_1\to 3^3{S}_1$ Atomic Transition in Helium
• Doppler-free intermodulated fluorescence spectroscopy of ${}^{4}He$ $2^{3}P-3^{1,3}D$ transitions at 588 nm with a one-watt compact laser system