Angular Momentum Partitioning and Hexacontatetrapole Moments in Impulsively Excited Argon Ions

High-order Dy multipole motifs observed in DyB2C2with resonant soft x-ray Bragg diffraction

“…Electronic orbital motifs are usually labeled antiferroquadrupolar (AFQ) or ferroquadrupolar (FQ) but higher order multipoles are not established by observations. Argon atoms in an excited state with l=3 show a significant presence of the higher order multipole moments as concluded from electron scattering [1], but in the solid state multipoles beyond rank 4 have never been detected. Yet the alignment of higher multipoles to the surrounding charge in the lattice is likely.…”

“…This illustrates merely one atomic tensor is active in the scattering process. We propose that this particular shape of the energy dependence of the (00 1 2 ) reflection is caused by the splitting of the 3d core states which results in multiple interfering resonators and consequently adds structure to the energy profile. Previously a core hole splitting caused by the intra-atomic magnetic interaction between 5f and 3d was used to describe the unusual double Lorentzian energy profile at the M 4 resonance in NpO 2 [15].…”

“…Lastly, D K Qq (α, β, γ) rotates F K q onto the coordinates of the experimental reference frame used for X K −Q with Euler angles α, β, γ. The Dy site symmetry of 2/m gives q=±2 and K=2 due to the absence of charge (K=0) and time-odd (magnetic) (K=1) order at (00 1 2 ) in the AFQ phase.…”

“…Zero degrees azimuth corresponds to alignment of the b axis in the scattering plane. The orbital ordering (00 1 2 ) reflection has been recorded at the Dy M 4,5 edges of DyB 2 C 2 at the RESOXS end-station of the SIM beam-line at the Swiss Light Source. The Dy M 4,5 absorption edges have been characterized with fluorescence yield (FY) and electron yield (EY) at RESOXS and the BL25SU beam line at SPring-8, respectively.…”

Progress with optically pumped sources of polarized electrons

“…in plasmas) [1], magnetism at surfaces (e.g. in nanostructures) [2], and the chiral structure of molecules [3].…”