Volume 59, Issue 5

3 August 1987

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LETTERS

General Physics

Space-time as a causal set

Luca Bombelli, Joohan Lee, David Meyer, and Rafael D. Sorkin

Phys. Rev. Lett. 59, 521 (1987) - Published 3 August, 1987

Relativistic, many-particle Lagrangean for electromagnetic interactions

R. A. Moore, T. C. Scott, and M. B. Monagan

Phys. Rev. Lett. 59, 525 (1987) - Published 3 August, 1987

Elementary Particles and Fields

Simple discrete symmetries in phenomenologically viable $E_{6}$ superstring models

Manuel Drees and Xerxes Tata

Phys. Rev. Lett. 59, 528 (1987) - Published 3 August, 1987

Operator regularization of Green’s functions

D. G. C. McKeon and T. N. Sherry

Phys. Rev. Lett. 59, 532 (1987) - Published 3 August, 1987

Nuclear Physics

First observation of a near-harmonic vibrational nucleus

A. Aprahamian, D. S. Brenner, R. F. Casten, R. L. Gill, and A. Piotrowski

Phys. Rev. Lett. 59, 535 (1987) - Published 3 August, 1987

Atomic, Molecular, and Optical Physics

Exact tricritical exponents for polymers at the FTHETA point in two dimensions

Bertrand Duplantier and Hubert Saleur

Phys. Rev. Lett. 59, 539 (1987) - Published 3 August, 1987

Squeezing of spontaneous emission in a laser

J. Gea-Banacloche

Phys. Rev. Lett. 59, 543 (1987) - Published 3 August, 1987

Nonlinear Dynamics, Fluid Dynamics, Classical Optics, Etc.

Single-mode operation of a high-power, step-tunable gyrotron

K. E. Kreischer and R. J. Temkin

Phys. Rev. Lett. 59, 547 (1987) - Published 3 August, 1987

Plasma and Beam Physics

Chaotic behavior and period doubling in plasmas

P. Y. Cheung and A. Y. Wong

Phys. Rev. Lett. 59, 551 (1987) - Published 3 August, 1987

Condensed Matter: Structure, Etc.

Wetting phenomena of binary liquid mixtures on chemically altered substrates

Douglas J. Durian and Carl Franck

Phys. Rev. Lett. 59, 555 (1987) - Published 3 August, 1987

Role of multiple scattering in x-ray photoelectron spectroscopy and Auger-electron diffraction in crystals

William F. Egelhoff, Jr.

Phys. Rev. Lett. 59, 559 (1987) - Published 3 August, 1987

An inference of high atom densities in solid tritium for nuclear magnetic resonance measurements

James R. Gaines, James D. Sater, Evelyn M. Fearon, P. C. Souers, Fred E. McMurphy, and Evan R. Mapoles

Phys. Rev. Lett. 59, 563 (1987) - Published 3 August, 1987

Phonon ringing and anharmonicity effects in core spectra

A. Mansour and S. E. Schnatterly

Phys. Rev. Lett. 59, 567 (1987) - Published 3 August, 1987

Ab initio determination of a structural phase transition temperature

K. M. Rabe and J. D. Joannopoulos

Phys. Rev. Lett. 59, 570 (1987) - Published 3 August, 1987

Mode anharmonicity in molecular crystals studied by piezomodulated Raman spectrosocpy

K. M. White and C. J. Eckhardt

Phys. Rev. Lett. 59, 574 (1987) - Published 3 August, 1987

Condensed Matter: Electronic Properties, Etc.

Spin localization in Si:P—direct evidence from ${}^{31}P$ NMR

H. Alloul and P. Dellouve

Phys. Rev. Lett. 59, 578 (1987) - Published 3 August, 1987

Two-dimensional open-orbit edge states: A new type of quantum oscillation

M. Ya. Azbel and P. M. Chaikin

Phys. Rev. Lett. 59, 582 (1987) - Published 3 August, 1987

Nature of the Griffiths phase

A. J. Bray

Phys. Rev. Lett. 59, 586 (1987) - Published 3 August, 1987

New configuration-coordinate model for the ground, excited, and metastable states of EL2 in GaAs

Yasunori Mochizuki and Toshiaki Ikoma

Phys. Rev. Lett. 59, 590 (1987) - Published 3 August, 1987

Test for low-Q, ‘‘infrared’’ spin-fluctuation effects in heavy fermions and ${}^{3}{He}$

P. C. E. Stamp

Phys. Rev. Lett. 59, 594 (1987) - Published 3 August, 1987

Optical pair interactions in the four-wave mixing spectrum of ${Nd}^{3 +}$ -doped β’’-Na-alumina

S. C. Rand, J. F. Lam, R. S. Turley, R. A. McFarlane, and O. M. Stafsudd

Phys. Rev. Lett. 59, 597 (1987) - Published 3 August, 1987

COMMENTS

Comment on ‘‘Excitonic coupling in GaAs/GaAlAs quantum wells in an electric field’’

Gerrit E. W. Bauer and Tsuneya Ando

Phys. Rev. Lett. 59, 601 (1987) - Published 3 August, 1987

Viña Iet al.P reply

L. Vina, R. T. Collins, E. E. Mendez, and W. I. Wang

Phys. Rev. Lett. 59, 602 (1987) - Published 3 August, 1987

Raman scattering from fractal structures

T. Keyes and T. Ohtsuki

Phys. Rev. Lett. 59, 603 (1987) - Published 3 August, 1987

Boukenter Iet al.P reply

A. Boukenter, B. Champagnon, E. Duval, and J. Serughetti

Phys. Rev. Lett. 59, 604 (1987) - Published 3 August, 1987

Comment on ‘‘Signature of g boson in the interacting-boson model from g-factor variations’’

Thomas D. Cohen

Phys. Rev. Lett. 59, 605 (1987) - Published 3 August, 1987

Comment on ‘‘Large intensity fluctuations for wave propagation in random media’’

C. A. Condat

Phys. Rev. Lett. 59, 606 (1987) - Published 3 August, 1987

Necessity of three or more generations for calculable Dirac neutrino masses in $E_{6}$ superstring models

Ernest Ma

Phys. Rev. Lett. 59, 607 (1987) - Published 3 August, 1987

ERRATA

X-Ray Scattering from Sodium-Doped Polyacetylene: Incommensurate-Commensurate and Order-Disorder Transformations

M. Winokur, Y. B. Moon, A. J. Heeger, J. Barker, D. C. Bott, and H. Shirakawa

Phys. Rev. Lett. 59, 608 (1987) - Published 3 August, 1987

Direct Subpicosecond Measurement of Carrier Mobility of Photoexcited Electrons in Gallium Arsenide

M. C. Nuss, D. H. Auston, and F. Capasso

Phys. Rev. Lett. 59, 608 (1987) - Published 3 August, 1987