Volume 61, Issue 22

28 November 1988

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LETTERS

General Physics

Lyapunov Exponent for Quantum Dissipative Systems

Hilda A. Cerdeira, K. Furuya, and B. A. Huberman

Phys. Rev. Lett. 61, 2511 (1988) - Published 28 November, 1988

Conformal Invariance and Intersections of Random Walks

Bertrand Duplantier and Kyung-Hoon Kwon

Phys. Rev. Lett. 61, 2514 (1988) - Published 28 November, 1988

Gravitation and Astrophysics

Equation of State and the Maximum Mass of Neutron Stars

M. Prakash, T. L. Ainsworth, and J. M. Lattimer

Phys. Rev. Lett. 61, 2518 (1988) - Published 28 November, 1988

Elementary Particles and Fields

Search for Multitrack Nucleon Decay

S. Seidel et al.

Phys. Rev. Lett. 61, 2522 (1988) - Published 28 November, 1988

Chiral Perturbation Theory and Final-State Theorem

Tran N. Truong

Phys. Rev. Lett. 61, 2526 (1988) - Published 28 November, 1988

Nuclear Physics

Measurement of the Differential Cross Section for the reaction ${}^{2}H (γ, p) n$ at High Photon Energies and $θ_{c . m .} = 90 °$

J. Napolitano et al.

Phys. Rev. Lett. 61, 2530 (1988) - Published 28 November, 1988

Nuclear Stopping at Intermediate Beam Energies

W. Bauer

Phys. Rev. Lett. 61, 2534 (1988) - Published 28 November, 1988

Atomic, Molecular, and Optical Physics

Application of Generalized Quantum-Defect Theory to Photodissociation Processes: Predissociation of Ar- $H_{2}$

M. Raoult and G. G. Balint-Kurti

Phys. Rev. Lett. 61, 2538 (1988) - Published 28 November, 1988

Observation of Positronium Specular Reflection from LiF

M. H. Weber, S. Tang, S. Berko, B. L. Brown, K. F. Canter, K. G. Lynn, A. P. Mills, Jr., L. O. Roellig, and A. J. Viescas

Phys. Rev. Lett. 61, 2542 (1988) - Published 28 November, 1988

Inhibited and Enhanced Spontaneous Emission from Optically Thin AlGaAs/GaAs Double Heterostructures

E. Yablonovitch, T. J. Gmitter, and R. Bhat

Phys. Rev. Lett. 61, 2546 (1988) - Published 28 November, 1988

Fundamental Phenomenology and Applications

Molecular Dynamics versus Hydrodynamics in a Two-Dimensional Rayleigh-Bénard System

M. Mareschal, M. Malek Mansour, A. Puhl, and E. Kestemont

Phys. Rev. Lett. 61, 2550 (1988) - Published 28 November, 1988

Self-Diffusion of Interacting Colloids Far from Equilibrium

Xia Qiu, H. Daniel Ou-Yang, D. J. Pine, and P. M. Chaikin

Phys. Rev. Lett. 61, 2554 (1988) - Published 28 November, 1988

Condensed Matter: Structure, Etc.

Self-Similarity of Diffusion-Limited Aggregates and Electrodeposition Clusters

F. Argoul, A. Arneodo, G. Grasseau, and Harry L. Swinney

Phys. Rev. Lett. 61, 2558 (1988) - Published 28 November, 1988

Experimental Evidence of Chain Extension at the Transition Temperature of a Nematic Polymer

J. F. D'Allest, P. Maïssa, A. ten Bosch, P. Sixou, A. Blumstein, R. Blumstein, J. Teixeira, and L. Noirez

Phys. Rev. Lett. 61, 2562 (1988) - Published 28 November, 1988

Nematic-Smectic- $A$ -Smectic- $C$ Transitions in Systems of Parallel Hard Molecules

A. M. Somoza and P. Tarazona

Phys. Rev. Lett. 61, 2566 (1988) - Published 28 November, 1988

Molecular Tribometry of Ultrathin Liquid Films

John Van Alsten and Steve Granick

Phys. Rev. Lett. 61, 2570 (1988) - Published 28 November, 1988

Solitary Modes and the Eckhaus Instability in Directional Solidification

Adam J. Simon, John Bechhoefer, and Albert Libchaber

Phys. Rev. Lett. 61, 2574 (1988) - Published 28 November, 1988

Electron-Stimulated-Desorption Ion Angular Distributions of Negative Ions

Allen L. Johnson, Stephen A. Joyce, and Theodore E. Madey

Phys. Rev. Lett. 61, 2578 (1988) - Published 28 November, 1988

The $XY$ Model Has Long-Range Order for All Spins and All Dimensions Greater than One

Tom Kennedy, Elliott H. Lieb, and B. Sriram Shastry

Phys. Rev. Lett. 61, 2582 (1988) - Published 28 November, 1988

Existence of Long-Range Order in the $XXZ$ Model

Kenn Kubo and Tatsuya Kishi

Phys. Rev. Lett. 61, 2585 (1988) - Published 28 November, 1988

Condensed Matter: Electronic Properties, Etc.

Can Pulsed Laser Excitation of Surfaces Be Described by a Thermal Model?

Janice M. Hicks, Lynn E. Urbach, E. Ward Plummer, and Hai-Lung Dai

Phys. Rev. Lett. 61, 2588 (1988) - Published 28 November, 1988

Direct Evidence from Gas-Phase Atomic Spectra for an Unscreened Intra-Atomic Origin of Outer-Core Multiplet Splittings in Solid Manganese Compounds

B. Hermsmeier, C. S. Fadley, M. O. Krause, J. Jimenez-Mier, P. Gerard, and S. T. Manson

Phys. Rev. Lett. 61, 2592 (1988) - Published 28 November, 1988

Femtosecond Studies of Image-Potential Dynamics in Metals

R. W. Schoenlein, J. G. Fujimoto, G. L. Eesley, and T. W. Capehart

Phys. Rev. Lett. 61, 2596 (1988) - Published 28 November, 1988

Nonequilibrium Critical and Multicritical Phase Transitions in Low-Temperature Electronic Transport of $p$ -Germanium

B. Röhricht, R. P. Huebener, J. Parisi, and M. Weise

Phys. Rev. Lett. 61, 2600 (1988) - Published 28 November, 1988

Determination of the Local Effect of Impurities on the Charge-Density-Wave Phase in Ta $S_{2}$ by Scanning Tunneling Microscopy

Xian-Liang Wu, Peng Zhou, and Charles M. Lieber

Phys. Rev. Lett. 61, 2604 (1988) - Published 28 November, 1988

Short-Range Ordering Due to Displacements of Thallium and Oxygen Atoms in Superconducting ${Tl}_{2}$ ${Ba}_{2}$ Ca ${Cu}_{2}$ $O_{8}$ Observed by Pulsed-Neutron Scattering

W. Dmowksi, B. H. Toby, T. Egami, M. A. Subramanian, J. Gopalakrishnan, and A. W. Sleight

Phys. Rev. Lett. 61, 2608 (1988) - Published 28 November, 1988

Inhibition of Strong-Coupling Superconductivity by Magnetic Impurities: a Quantum Monte Carlo Study

Mark Jarrell

Phys. Rev. Lett. 61, 2612 (1988) - Published 28 November, 1988

Evidence for Spin-Polarized Electrons of Highly Stripped Fluorine Ions Emerging from Thin Ferromagnetic Layers

K. -H. Speidel, M. Knopp, W. Karle, P. Maier-Komor, H. -J. Simonis, F. Hagelberg, J. Gerber, and P. N. Tandon

Phys. Rev. Lett. 61, 2616 (1988) - Published 28 November, 1988

Cross-Disciplinary Physics

Viscoelasticity of Near-Critical Gels

James E. Martin, Douglas Adolf, and Jess P. Wilcoxon

Phys. Rev. Lett. 61, 2620 (1988) - Published 28 November, 1988

COMMENTS

Comment on "Tests of the Exponential Decay Law at Short and Long Times"

F. T. Avignone, III

Phys. Rev. Lett. 61, 2624 (1988) - Published 28 November, 1988

Comment on "Landau Theory of the Crumpling Transition"

J. P. Bouchaud and E. Bouchaud

Phys. Rev. Lett. 61, 2625 (1988) - Published 28 November, 1988

Comment on "Peak Number Density of Non-Gaussian Random Fields"

P. Coles

Phys. Rev. Lett. 61, 2626 (1988) - Published 28 November, 1988

Catelan, Lucchin, and Matarrese Reply

Paolo Catelan, Francesco Lucchin, and Sabino Matarrese

Phys. Rev. Lett. 61, 2627 (1988) - Published 28 November, 1988

Comment on "Mixed Valency versus Covalency in Rare-Earth Core-Electron Spectroscopy"

S. Hüfner, P. Steiner, and V. Kinsinger

Phys. Rev. Lett. 61, 2628 (1988) - Published 28 November, 1988

Kaindl and Wertheim Reply

G. Kaindl and G. K. Wertheim

Phys. Rev. Lett. 61, 2629 (1988) - Published 28 November, 1988

Quasiparticle Statistics in Time-Reversal Invariant States

S. A. Kivelson and D. S. Rokhsar

Phys. Rev. Lett. 61, 2630 (1988) - Published 28 November, 1988

Laughlin and Kalmeyer Reply

R. B. Laughlin and V. Kalmeyer

Phys. Rev. Lett. 61, 2631 (1988) - Published 28 November, 1988

Comment on "Two-Level Systems Observed in the Mechanical Properties of Single-Crystal Silicon at Low Temperatures"

W. A. Phillips

Phys. Rev. Lett. 61, 2632 (1988) - Published 28 November, 1988

ERRATA

Limits on the Neutrino Magnetic Moment from Sn1987A

James M. Lattimer and J. Cooperstein

Phys. Rev. Lett. 61, 2633 (1988) - Published 28 November, 1988

Resonant Tunneling with Electron-Phonon Interaction: An Exactly Solvable Model

Ned S. Wingreen, Karsten W. Jacobsen, and John W. Wilkins

Phys. Rev. Lett. 61, 2633 (1988) - Published 28 November, 1988