Precise Frequency Measurement of the 2${}^1$S${}_0$-3${}^1$D${}_2$ Two-Photon Transition in atomic ${}^4$He

Abstract

We present the first precise frequency measurement of the 2${}^1$S${}_0$-3${}^1$D${}_2$ two-photon transition in ${}^4$He at 1009 nm. The laser source at 1009 nm is stabilized on an optical frequency comb to perform the absolute frequency measurement. The absolute frequency of 2${}^1$S${}_0$-3${}^1$D${}_2$ transition is experimentally determined to be 594 414 291 803(13) kHz with a relative uncertainty of 1.6 $\times$ 10${}^{-11}$ which is more precise than previous determination by a factor of 25. Combined with the theoretical ionization energy of the 3${}^1$D${}_2$ state, the ionization energy of the 2${}^1$S${}_0$ state is determined to be 960 332 040 866(24) kHz. In addition, the deduced 2${}^1$S${}_0$ and 2${}^3$S${}_1$ Lamb shifts are 2806.817(24) and 4058.8(24) MHz respectively which are 1.6 times better than previous determinations.

5 pages, 6 figures

References in corpus (4)

• Frequency metrology in quantum degenerate helium: Direct measurement of the 2 3S1 - 2 1S0 transition
• Theoretical energies of low-lying states of light helium-like ions
• Testing fundamental interactions on the helium atom
• High-precision spectroscopy of the forbidden 2 3S1 - 2 1P1 transition in quantum degenerate metastable helium

Cited by in corpus (6)

• Precision spectroscopy of helium in a magic wavelength optical dipole trap
• Absolute frequency measurement of rubidium 5S-6P transitions
• Atomic structure calculations of helium with correlated exponential functions
• QED and relativistic nuclear recoil corrections to the 413 nm tune-out wavelength for the $2{}^3{S}_1$ state of helium
• QED calculation of ionization energies of $1snd$ states in helium
• Quantum electrodynamic corrections to the $1s3d$ states of the helium atom