Volume 179, Issue 2

March 1969

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ARTICLES

Relaxation in a Jahn-Teller System. I. Copper in Octahedral Water Coordination

D. P. BREEN, D. C. KRUPKA, and F. I. B. WILLIAMS

Phys. Rev. 179, 241 (1969) - Published 10 March, 1969

Relaxation in a Jahn-Teller System. II

F. I. B. WILLIAMS, D. C. KRUPKA, and D. P. Breen

Phys. Rev. 179, 255 (1969) - Published 10 March, 1969

Systematics of the Hyperfine and Exchange Interactions in the Chromium Chalcogenide Spinels

S. B. Berger, J. I. Budnick, and T. J. Burch

Phys. Rev. 179, 272 (1969) - Published 10 March, 1969

Magnetic Interactions between Rare-Earth Ions in Insulators. II. Electron-Paramagnetic-Resonance Measurements of ${Gd}^{3 +}$ Pair and ${Gd}^{3 +}$ - ${Eu}^{3 +}$ Interaction Constants in Eu ${Cl}_{3}$

R. J. BIRGENEAU, M. T. HUTCHINGS, and W. P. WOLF

Phys. Rev. 179, 275 (1969) - Published 10 March, 1969

Covalence Effect on the Second Moments of the ESR Absorption Curves. Case of ${Na}_{4}$ [ ${Cu}^{II}$ ${(N H_{3})}_{4}$ ] ${[{Cu}^{I} {(S_{2} O_{3})}_{2}]}_{2}$

E. BULUGGIU, A. DALL'OLIO, G. DASCOLA, and V. VARACCA

Phys. Rev. 179, 289 (1969) - Published 10 March, 1969

Photon Echoes in Gases

J. P. GORDON, C. H. WANG, C. K. N. PATEL, R. E. SLUSHER, and W. J. TOMLINSON

Phys. Rev. 179, 294 (1969) - Published 10 March, 1969

Energy Straggling of Alpha Particles through Gases

J. J. RAMIREZ, R. M. PRIOR, J. B. SWINT, A. R. QUINTON, and R. A. BLUE

Phys. Rev. 179, 310 (1969) - Published 10 March, 1969

Potential-Energy and Differential-Stopping-Power Functions from Energy-Loss Spectra of Fast Ions Channeled in Gold Single Crystals

S. DATZ, C. D. MOAK, T. S. NOGGLE, B. R. APPLETON, and H. O. LUTZ

Phys. Rev. 179, 315 (1969) - Published 10 March, 1969

Interpretation of Channeled-Ion Energy-Loss Spectra

Mark T. Robinson

Phys. Rev. 179, 327 (1969) - Published 10 March, 1969

Magnon-Assisted Optical Emission in YCr $O_{3}$ and LuCr $O_{3}$

J. P. VAN DER ZIEL and L. G. VAN UITERT

Phys. Rev. 179, 343 (1969) - Published 10 March, 1969

Effective Linewidth due to Porosity and Anisotropy in Polycrystalline Yittrium Iron Garnet and Ca-V-Substituted Yittrium Iron Garnet at 10 GHz

Carl E. PATTON

Phys. Rev. 179, 352 (1969) - Published 10 March, 1969

Nuclear Magnetic Resonance in Hexagonal Lanthanum Metal: Knight Shifts, Spin Relaxation Rates, and Quadrupole Coupling Constants

Albert NARATH

Phys. Rev. 179, 359 (1969) - Published 10 March, 1969

Quantum Theory of an Optical Maser. III. Theory of Photoelectron Counting Statistics

MARLAN O. SCULLY and WILLIS E. LAMB, JR.

Phys. Rev. 179, 368 (1969) - Published 10 March, 1969

Far-Infrared Spectra of ${Al}_{2}$ $O_{3}$ Doped with Ti, V, and Cr

R. R. JOYCE and P. L. RICHARDS

Phys. Rev. 179, 375 (1969) - Published 10 March, 1969

Use of the Relaxation Function in the Nuclear Magnetic Resonance Analysis of Internal Motions in Solids

EDWIN M. ROBERTS and CHARLES W. MERIDETH

Phys. Rev. 179, 381 (1969) - Published 10 March, 1969

Energy Loss and Straggling in Silicon by High-Energy Electrons, Positive Pions, and Protons

D. W. AITKEN, W. L. LAKIN, and H. R. ZULLIGER

Phys. Rev. 179, 393 (1969) - Published 10 March, 1969

Theory of an Inhomogeneously Broadened Laser Amplifier

FREDERIC A. HOPE and Marlan O. Scully

Phys. Rev. 179, 399 (1969) - Published 10 March, 1969

Critical and Spin-Wave Scattering of Neutrons from Iron

M. F. COLLINS, V. J. MINKIEWICZ, R. NATHANS, L. PASSELL, and G. SHIRANE

Phys. Rev. 179, 417 (1969) - Published 10 March, 1969

Soft Modes, Critical Fluctuations, and Optical Properties for a Two-Valley Model of Gunn-Instability Semiconductors

E. PYTTE and H. THOMAS

Phys. Rev. 179, 431 (1969) - Published 10 March, 1969

Upper Critical Field of Two-Band Superconductors Containing Nonmagnetic Impurities. II

W. S. CHOW

Phys. Rev. 179, 444 (1969) - Published 10 March, 1969

Field Penetration in a Semi-Infinite Type-I Superconductor

C. EBNER and P. F. MILLERON

Phys. Rev. 179, 447 (1969) - Published 10 March, 1969

Influence of Superconductivity on the Half-Life of $Niobium - 90^{m}$

ARTHUR OLIN and KENNETH T. BAINBRIDGE

Phys. Rev. 179, 450 (1969) - Published 10 March, 1969

Superconducting Isotope Effect in Molybdenum Boride and Tungsten Boride

J. J. ENGELHARDT

Phys. Rev. 179, 452 (1969) - Published 10 March, 1969

Pressure Dependence of the Superconducting Transition Temperature

P. E. SEIDEN

Phys. Rev. 179, 458 (1969) - Published 10 March, 1969

Measurement of the Elastic Constants and Search for Collective Oscillations of the Vortex Lattice in a Type-II Superconductor (Niobium)

P. P. M. MEINCKE and W. A. REED

Phys. Rev. 179, 463 (1969) - Published 10 March, 1969

Anisotropy of the Superconducting Energy Gap in Th

J. W. ANDERSON, D. T. PETERSON, and D. K. FINNEMORE

Phys. Rev. 179, 472 (1969) - Published 10 March, 1969

Flux Motion in Type-I Superconductors

P. R. SOLOMON

Phys. Rev. 179, 475 (1969) - Published 10 March, 1969

Phenomenology of Shape Effects in Amperian Magnetic Systems with Application to Superconductors

J. A. CAPE

Phys. Rev. 179, 485 (1969) - Published 10 March, 1969

Nonlinear Effects on the Conductivity of a Superconductor above Its Transition Temperature

J. P. HURAULT

Phys. Rev. 179, 494 (1969) - Published 10 March, 1969

Critical Magnetic Fields of Superconducting SnTe

R. A. HEIN and P. H. E. MEIJER

Phys. Rev. 179, 497 (1969) - Published 10 March, 1969

Low-Temperature Resistivity in a "Giant" Moment Alloy

L. SHEN, D. S. SCHREIBER, and A. J. ARKO

Phys. Rev. 179, 512 (1969) - Published 10 March, 1969

Anisotropy of the Europium-Iron Exchange Interaction in Rare-Earth Iron Garnets

U. ATZMONY, E. R. BAUMINGER, A. MUSTACHI, I. NOWIK, S. OFER, and M. TASSA

Phys. Rev. 179, 514 (1969) - Published 10 March, 1969

Magnetic Davydov Splittings in the Optical Absorption Spectrum of ${Cr}_{2}$ $O_{3}$

J. W. ALLEN, R. M. MACFARLANE, and R. L. WHITE

Phys. Rev. 179, 523 (1969) - Published 10 March, 1969

Direct Measurements of Anisotropy Energy and Anisotropic Magnetization in Gallium Iron Oxide

JOHN H. SCHELLENG and GEORGE T. RADO

Phys. Rev. 179, 541 (1969) - Published 10 March, 1969

${Rb}^{87}$ Quadrupole Coupling and the Ferroelectric Transition in Rb $H_{2}$ As $O_{4}$

R. BLINC and M. MALI

Phys. Rev. 179, 552 (1969) - Published 10 March, 1969

Ising Model with Second-Neighbor Interaction. I. Some Exact Results and an Approximate Solution

CHUNGPENG FAN and F. Y. WU

Phys. Rev. 179, 560 (1969) - Published 10 March, 1969

Exact Solution for a Linear Chain of Isotropically Interacting Classical Spins of Arbitrary Dimensionality

H. E. STANLEY

Phys. Rev. 179, 570 (1969) - Published 10 March, 1969

Multiple Charge States, Hyperfine Interactions, and Relaxation Processes of Fe in ${}^{57}{C o - D o p e d}$ MgO

J. CHAPPERT, R. B. FRANKEL, A. MISETICH, and N. A. BLUM

Phys. Rev. 179, 578 (1969) - Published 10 March, 1969

COMMENTS

Comments on Origin of Solvent Knight Shifts in Alloys

R. E. WATSON, L. H. BENNETT, and A. J. FREEMAN

Phys. Rev. 179, 590 (1969) - Published 10 March, 1969

ERRATA

Thermal Conductivity of Superconducting Tin Films in a Magnetic Field

JOHN E. SMITH, JR. and D. M. GINSBERG

Phys. Rev. 179, 592 (1969) - Published 10 March, 1969