Communication: The permanent electric dipole moment of thorium monoxide, ThO

Abstract

The optical Stark spectrum of the E(0+) − X1Σ+ (1,0) band of thorium monoxide, ThO, was recorded and analyzed to determine the permanent electric dipole moments, μ, for the E(0+) (v = 1) and X1Σ+ (v = 0) states. Values of 2.782 ± 0.012 D (X) and 3.534 ± 0.010 D (E) were obtained. The uncertainties are 2σ statistical error. The systematic errors are estimated to be less than 1%. The experimental results are used to access the quality of electronic structure calculations of the properties of the X1Σ+ (v = 0) state.

Assessing the Accuracy of Simplified Coupled Cluster Methods for Electronic Excited States in F0 Actinide Compounds

“…Despite their simplicity, both compounds are of considerably growing importance in the search of the electron electric dipole moment (eEDM). [69][70][71][72][73] While the electronic spectrum of ThO has been investigated using many quantum chemistry methods, [73][74][75][76][77][78][79][80] the electronic −0.5…”

Characterization of theI(|Ω|=1)–X1Σ+(0,Kokkin1, Steimle2, DeMille3 2015Phys. Rev. ASelf Cite12070View full textAdd to dashboardCite

“…The rotational constant, B, was constrained to the previously determined value of 0.331967 cm -1 [5]. The energy levels of the ( 1) I Ω = state were modelled using an effective Hamiltonian appropriate for a 1 Π state:…”

“…The experimental set up used in the present study is similar to that used in the previous study of the E( Ω =0 + ) -X 1 Σ + (1,0) band [5]. A supersonic molecular beam sample was probed by the output of a single frequency cw-dye laser and the resulting laser induced fluorescence (LIF) was monitored on resonance through a ±10 nm band pass filter centered at 510 nm.…”

Formation of solid thorium monoxide at near-ambient conditions as observed by neutron reflectometry and interpreted by screened hybrid functional calculations

“…[14] [17] It is being studied in the search for a permanent electron electric dipole moment (eEDM), an important fundamental modern physics problem. [18] [19] Interestingly, recent theoretical work suggests that solid ThO is stable under high-pressure conditions. [20] Nevertheless, the clear demonstration of solid ThO as a dominant phase at ambient conditions has not been observed, though it has been long-sought.…”