Measurement of the Electric Quadrupole Moment of the4d D5/22Level in

Abstract

The quadrupole moment of the 4d (2)D(5/2) level in 88Sr+ has been measured to be 2.6(3)ea(2)(0), where a(0) is the Bohr radius and e the elementary charge. A single laser-cooled strontium ion was confined in an end cap trap with a variable dc quadrupole potential, and measurements were made on the 5s (2)S(1/2)-4d (2)D(5/2) transition at 674 nm using a femtosecond optical frequency comb. This work shows that measurements of the unperturbed 88Sr+ transition frequency with sub-Hz uncertainty are possible and is important in understanding the reproducibility of ion trap optical frequency standards.

Optical atomic clocks with suppressed blackbody-radiation shift

“…The values of typical electric field gradients in ion trap [14] that leads to the relative frequency shift for double ionized erbium is ∆ω Q /ω 0 ∼ 10 −15 , while for optical lattice clocks on neutral erbium these values are ∂E z /∂z ∼ 10 7 V/m 2 [15] and ∆ω Q /ω 0 ∼ 10 −14 respectively. For other atoms and ions the relative quadrupole shifts may be significantly larger and therefore require accurate treatment.…”

Precision measurement of the branching fractions of the5pP1/22state inSrLikforman1, Tugayé2, Guibal3 et al. 2016Phys. Rev. A18180View full textAdd to dashboardCite

“…By restricting ourselves to the case of heavier alkali-earth (i.e. species with D metastable states), these techniques have been recently applied to obtain precision measurements of spectroscopical quantities on laser-cooled 40 Ca + ions [9][10][11][12], 138 Ba + ions [13][14][15], and 88 Sr + ions [16][17][18][19]. In this paper we present the precision measurement of the branching fractions for the decay of the 5p 2 P 1/2 state of 88 Sr + .…”

“…Theoretical works on 88 Sr + are largely motivated by the use the dipole-forbidden "clock" 5s 2 S 1/2 → 4d 2 D 5/2 Sr + transition (ν = 446 THz, λ = 674 nm) as a secondary frequency standard [16,17,26]. Indeed, in 2006 the International Committee for Weights and Measures (CIPM) has included this transition among the recommended secondary representation of the second [27].…”

High-fidelity simulations of ion trajectories in miniature ion traps using the boundary-element method

“…From the secular frequencies, the DC component of the electric quadrupole field gradient can be calculated, which can be used to determine the quadrupole moment of an ion [17]. This can be useful when designing traps for atomic clocks and frequency standards with different ions.…”

“…III, the ion secular frequencies were calculated from numerically obtained ion trajectories for both an endcap and circular linear trap. Endcap traps are used for atomic clocks and optical frequency standards at NPL [17]. Circular linear traps were used for quantum computing experiments at Innsbruck [18].…”