Faraday Rotation for theFBand in KCI

Abstract

Therefore the wave is not fully formed during this time, which is quite reasonable.Experiments have been run at several pressures in argon and helium and qualitatively similar behavior is obtained.In conclusion, in the presence of strong preheating the compression zone displays true magnetohydrodynamic characteristics with strong coupling between the gas and electromagnetic fields, as distinct from the ordinary shocks which are observed in the absence of preheating.This work was supported by the Francis I. Du-Pont Fund for Magnetohydrodynamic Research. The author wishes to thank Professor H. W. Liepmann for his interest and encouragement during the course of the investigation. He further wishes to acknowledge helpful discussions with F. Y.Although measurements with electron spin resonance 1 and electron nuclear double resonance 2 have provided accurate information about the magnetic splitting of the F-center ground state, there is a complete lack of corresponding knowledge about the excited state of this center. Zeeman experiments in absorption offer a means of investigating the magnetic splitting in the unrelaxed excited state; however, the expected splitting of about 10~4 eV would be difficult to detect in the presence of a F-band width of about 0.2 eV.Faraday rotation, on the other hand, is a sensitive means of detecting small changes in the dispersive properties of crystals in a magnetic field. Dexter 3 calculated the extra dispersion introduced into a KC1 crystal by the presence of F centers. With certain assumptions about the magnetic energy levels involved, he predicted the spectral dependence for Faraday rotation. A quantitative comparison with earlier experimental work 4 * 5 proved impossible because of experimental uncertainties and lack of detail.In our experiment a dynamical method of measurement is used. Light from a Leiss double monochromator is plane polarized and focused onto the sample which is located at the center of a 50-kilogauss superconducting solenoid in a liquid helium Dewar. The transmitted light passes through a rotating polarizer and is detected by a

Physics and Current Understanding of X-Ray Storage Phosphors

“…For S > 1=2 systems the polarisation P is given by the Brillouin function (see e.g., [10]). Figure 1 schematically represents the circularly polarised transitions for an alkali atom model, which is often used to describe the MCDA of an F centre (electron trapped in an anion vacancy) in alkali halides [12]. The excited state is split by the spin-orbit interacphys.…”

“…1. Schematic diagram of the energy levels in the alkali atom model to explain the MCDA of an F centre [12]. The Dm J = +1 transitions absorb right, and the Dm J = --1 transitions left circularly polarised light.…”

Magnetic Circular Dichroism of the K‐Band in Alkali Halides

“…For comparison we also list the spin-orbit splittings of the F-band A , [2]. The errors are in the cases of KCl, RbCl, and RbBr about 15%, in the cases of KBr, K I , and R b I about 30%.…”

Spin-orbit coupling, spin-lattice relaxation, and spin-memory studies ofF-center-molecular-ion pairs in alkali halides

“…In the case of the F center, detailed investigations have been made to deduce the relative weight of the various processes [16][17][18][19] and the main contribution to ~ appears to derive from the absorption [20][21][22]. It is worthwhile to remember at this point that the magneto-optical properties of the F center have been interpreted at first with an alkali atom model [23]. Though the shape of MCD is well explained by this model, the values of z predicted are much larger than those measured [24,25].…”