Volume 50, Issue 17

25 April 1983

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LETTERS

General Physics

Random Walk in a Random Environment and $\frac{1}{f}$ Noise

E. Marinari, G. Parisi, D. Ruelle, and P. Windey

Phys. Rev. Lett. 50, 1223 (1983) - Published 25 April, 1983

Chaos in a Perturbed Nonlinear Schrödinger Equation

Kazuhiro Nozaki and Naoaki Bekki

Phys. Rev. Lett. 50, 1226 (1983) - Published 25 April, 1983

Elementary Particles and Fields

Energetic Stability Criterion for a Nonlinear Spinorial Model

A. Alvarez and M. Soler

Phys. Rev. Lett. 50, 1230 (1983) - Published 25 April, 1983

Spectroscopic Search for Fractional Charge in Ultrapure Semiconductors

M. J. H. van de Steeg, H. W. H. M. Jongbloets, and P. Wyder

Phys. Rev. Lett. 50, 1234 (1983) - Published 25 April, 1983

Electroweak Effects in $e^{+} e^{-} \to μ^{+} μ^{-}$ at 29 GeV

E. Fernandez et al.

Phys. Rev. Lett. 50, 1238 (1983) - Published 25 April, 1983

Classical Upper Bounds for Grand-Unified Monopole Masses

A. N. Schellekens and Cosmas K. Zachos

Phys. Rev. Lett. 50, 1242 (1983) - Published 25 April, 1983

Nuclei

Neutron Multiplicity Distributions and the Role of Transfer and Breakup in Quasielastic Heavy-Ion Reactions at 15 MeV/Nucleon

U. Jahnke, G. Ingold, H. Homeyer, M. Bürgel, Ch. Egelhaaf, H. Fuchs, and D. Hilscher

Phys. Rev. Lett. 50, 1246 (1983) - Published 25 April, 1983

Semiclassical Calculation of One-Particle, One-Hole and Two-Particle, Two-Hole Level Densities

G. Ghosh, R. W. Hasse, P. Schuck, and J. Winter

Phys. Rev. Lett. 50, 1250 (1983) - Published 25 April, 1983

Rotation-Alignment Effect in ${}^{198}{Hg}$ in an Angular-Momentum-Projected Band-Mixing Calculation

C. R. Praharaj and S. B. Khadkikar

Phys. Rev. Lett. 50, 1254 (1983) - Published 25 April, 1983

Atoms and Molecules

Two-Photon Transitions in Positronium

A. Quattropani and F. Bassani

Phys. Rev. Lett. 50, 1258 (1983) - Published 25 April, 1983

Observation and Quasistatic Analysis of Structure in Microwave Ionization of Highly Excited Helium Atoms

D. R. Mariani, W. van de Water, P. M. Koch, and T. Bergeman

Phys. Rev. Lett. 50, 1261 (1983) - Published 25 April, 1983

Shape Resonance Phenomena in CO Following $K$ -Shell Photoexcitation

C. M. Truesdale, S. H. Southworth, P. H. Kobrin, U. Becker, D. W. Lindle, H. G. Kerkhoff, and D. A. Shirley

Phys. Rev. Lett. 50, 1265 (1983) - Published 25 April, 1983

Classical Phenomenology and Applications

Experimental Test of the Optical Bloch Equations for Solids

Ralph G. DeVoe and Richard G. Brewer

Phys. Rev. Lett. 50, 1269 (1983) - Published 25 April, 1983

Nonlinear Stochastic Processes Driven by Colored Noise: Application to Dye-Laser Statistics

S. N. Dixit and Paramdeep S. Sahni

Phys. Rev. Lett. 50, 1273 (1983) - Published 25 April, 1983

Condensed Matter: Structure, Etc.

Large-Angle Electron-Energy-Loss Spectroscopy with the Inclusion of a Surface Image Potential

B. M. Hall, S. Y. Tong, and D. L. Mills

Phys. Rev. Lett. 50, 1277 (1983) - Published 25 April, 1983

Electronic Spin of the Ga Vacancy in GaP

T. A. Kennedy, N. D. Wilsey, J. J. Krebs, and G. H. Stauss

Phys. Rev. Lett. 50, 1281 (1983) - Published 25 April, 1983

Semiempirical, Quantum Mechanical Calculation of Hydrogen Embrittlement in Metals

Murray S. Daw and M. I. Baskes

Phys. Rev. Lett. 50, 1285 (1983) - Published 25 April, 1983

Dipolar Reorientation and Order-Disorder Behavior of Pure and Mixed Alkali Cyanides

Fritz Lüty and Jaime Ortiz-Lopez

Phys. Rev. Lett. 50, 1289 (1983) - Published 25 April, 1983

Direct Analysis of the Structure, Concentration, and Chemical Activity of Surface Atomic Vacancies by Specialized Low-Energy Ion-Scattering Spectroscopy: TiC(001)

M. Aono, Y. Hou, R. Souda, C. Oshima, S. Otani, and Y. Ishizawa

Phys. Rev. Lett. 50, 1293 (1983) - Published 25 April, 1983

Fluctuations in Short-Range Spin-Glasses

H. Sompolinsky and Annette Zippelius

Phys. Rev. Lett. 50, 1297 (1983) - Published 25 April, 1983

Condensed Matter: Electronic Properties, Etc.

Nature of the Active Site in Surface-Enhanced Raman Scattering

T. E. Furtak and D. Roy

Phys. Rev. Lett. 50, 1301 (1983) - Published 25 April, 1983

Approaches for Reducing the Insulator-Metal Transition Pressure in Hydrogen

A. E. Carlsson and N. W. Ashcroft

Phys. Rev. Lett. 50, 1305 (1983) - Published 25 April, 1983

Nonlinear Far-Infrared Magnetoabsorption and Optically Detected Magnetoimpurity Effect in $n$ -GaAs

C. R. Pidgeon, A. Vass, G. R. Allan, W. Prettl, and L. Eaves

Phys. Rev. Lett. 50, 1309 (1983) - Published 25 April, 1983

Modulation Spectrum from an Electron-Spin-Resonance Line

Boris Rakvin, T. Islam, and Ichiro Miyagawa

Phys. Rev. Lett. 50, 1313 (1983) - Published 25 April, 1983

Optical Properties of Small Metal Spheres: Surface Effects

P. Apell and David R. Penn

Phys. Rev. Lett. 50, 1316 (1983) - Published 25 April, 1983

Ferromagnets with Random Anisotropy: Longitudinal Spin Resonance and Movable Anisotropy

W. M. Saslow

Phys. Rev. Lett. 50, 1320 (1983) - Published 25 April, 1983

Cross-Disciplinary Physics

Excitation Transport on Substitutionally Disordered Lattices

Roger F. Loring, Hans C. Andersen, and M. D. Fayer

Phys. Rev. Lett. 50, 1324 (1983) - Published 25 April, 1983

COMMENTS

Comment on "Hopping Mechanism Generating $\frac{1}{f}$ Noise in Nonlinear Systems"

M. R. Beasley, D. D'Humieres, and B. A. Huberman

Phys. Rev. Lett. 50, 1328 (1983) - Published 25 April, 1983

Comment on "Hopping Mechanism Generating $\frac{1}{f}$ Noise in Nonlinear Systems"

Richard F. Voss

Phys. Rev. Lett. 50, 1329 (1983) - Published 25 April, 1983

Arecchi and Lisi Respond

F. T. Arecchi and F. Lisi

Phys. Rev. Lett. 50, 1330 (1983) - Published 25 April, 1983

Comment on "Molecule Formation During Sputtering by Two-Body Associative Ionization with Diabatic Curve Crossing

C. M. Loxton, I. S. T. Tsong, and S. H. Lin

Phys. Rev. Lett. 50, 1331 (1983) - Published 25 April, 1983

Snowdon and Heiland Respond

K. Snowdon and W. Heiland

Phys. Rev. Lett. 50, 1332 (1983) - Published 25 April, 1983

ERRATA

Laser-Fluorescence Mass Spectroscopy.

D. J. Wineland, J. J. Bollinger, and Wayne M. Itano

Phys. Rev. Lett. 50, 1333 (1983) - Published 25 April, 1983