Addendum

The magnetic properties of ferrimagnetic fine particles in rocks have many parallels with those of spin glasses, magnetic recording media, ferrofluids and biomagnetic systems. The present brief review touches on some recent developments in rock magnetism that may be of interest to workers in these other fields.     

Addendum

Quantum beat spectroscopy has been used to determine the lifetimes and disalignment cross sections of the 2p₂ and 2p₅ states in the $\text{2p}{}^5\text{(}{}^2\text{P}{}_{\mathrm{<mtext>1</mtext><mtext>2</mtext>}}\text{)}$ 3p manifold of neon. Time-resolved differential lineshape data permit a simple extraction of the lifetimes and cross sections to a precision that matches or exceeds the best previous measurements. The results are in good agreement with previous experimental values, but the agreement with theory is less certain.     

Addendum

A continuum model potential taking into account a spatially varying dielectric constant is employed to make a fully self-consistent calculation of the enhancement of the donor polarizability as a function of donor concentration N_D as N_D approaches N_c, the critical concentration for metallic behavior. The results yield a new self-consistent Clausius-Mossotti criterion for the polarization catastrophe at N_c. Using the dilute concentration value of the donor polarizability N_c is uniquely determined. The results are compared with earlier experimental results for N-type silicon and with other theoretical calculations.     

Addendum

Accurate valence band dispersions E$\text{k}$ of LaB₆ have been determined along three main symmetry lines ΓM, ΓX, and XM using one single crystal (001) surface by a simple new photoemission technique of general utility. Using direct interband transitions, E$\text{k}$dispersions are mapped out by suitably scanning polar emission angle and the photon energy. Detailed results agree well with recent Xα-APW energy band calculations.