Very High Pressure Effects upon the EPR Spectrum of Ruby

Abstract

The variation in the electron paramagnetic resonance (EPR) spectrum of ruby as a function of pressure has been observed to beyond 70 kbar for a magnetic field orientation parallel to the crystalline c axis. The data can be interpreted in terms of the usual spin Hamiltonian: H=g||βHzSz−12δ(Sz2−13S2), where the spectroscopic splitting factor g‖ has the same value as at ambient pressures, but where the zero-field splitting δ increases in a linear fashion from ∼0.38 to ∼0.43 cm−1. The experimental apparatus has been described previously, although important improvements in the pressure seal and in the pressure calibration have been made and are described in an Appendix.

Dielectric resonator-based resonant structure for sensitive ESR measurements at high-hydrostatic pressures

“…6-8 GPa for the cavitybased ESR high-pressure systems was established while using a solid pressure-transmitting medium and a set of Bridgman-type anvils made of Al 2 O 3 that were directly incorporated into the resonant cavity [18][19][20].…”

Unified Calculations of the Energy and EPR Spectra and Their Pressure-Induced Shifts of Ruby

“…[18], adopting the strong-field scheme and trigonal bases,' 21 ' we constructed ;he 120 x 120 complete energy matrix of d 3 electronic configuration in a trigonally distorted ;ubic-field, where B and C are Racah parameters; 10Dg is the cubic-field parameter; C and " are the spin-orbit coupling parameters; K and K' are the trigonal-field parameters. In the present work, by means of the diagonalization of the complete energy matrix (DCEM) to fit the experimental data of the optical and EPR spectra of ruby,' [1][2][3] ' we have determined the values of the parameters at normal pressure Dqo = 1775.4, B Q = 673.3, Co = 3085.3, Co = 217.5, Co = 194.54, K 0 = -200.0, K 0 = -440.0 (cm -1 ); and the energy spectrum of ruby at normal pressure has also been obtained. Here, the values of Dqo, Bo and Co are almost the same as those in Ref.…”

Local Lattice Structure Study of the Octahedral (CrO6)9- Clusters for Cr3+ Ion Doping in a Variety of Oxide Crystals by Simulating the Corresponding EPR and Optical Spectra

“…at Room Temperature and A 4 = 36.53 a.u. at Low Temperature (77 K), Respectively, 2 D in Units of cm -1 compd T (K)Δ R (Å)Δ X (Å)2 D g ∥ g ⊥ Δ g ( = g ∥ − g ⊥ ) Al 2 O 3 77 0.0419 0.02878 −0.3831 1.9858 1.9869 −0.0011 expt − −0.383 1.9840 1.9867 −0.0027 LiNbO 3 77 0.040 0.03583 −0.7730 1.9719 1.9753 −0.0034 expt −0.773 1.9720 LiTaO 3 300 0.0472 0.04665 −0.888 1.9696 1.9728 −0.0032 expt 42 −0.888 1.9720 LiIO 3 77 −0.054 0.0359 −1.2198 1.9647 1.9704 −0.0057 expt −1.2198 1.9650 1.9710 −0.0060…”