Volume 67, Issue 11

9 September 1991

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LETTERS

General Physics

Rational mappings, arborescent iterations, and the symmetries of integrability

M. P. Bellon, J-M. Maillard, and C-M. Viallet

Phys. Rev. Lett. 67, 1373 (1991) - Published 9 September, 1991

Fast delocalization in a model of quantum kicked rotator

Ricardo Lima and Dima Shepelyansky

Phys. Rev. Lett. 67, 1377 (1991) - Published 9 September, 1991

Gravitation and Astrophysics

Supersymmetric Bianchi type IX cosmology

Robert Graham

Phys. Rev. Lett. 67, 1381 (1991) - Published 9 September, 1991

Elementary Particles and Fields

Three-point function at finite temperature in the real-time formalism

R. Kobes

Phys. Rev. Lett. 67, 1384 (1991) - Published 9 September, 1991

Asymptotic estimate of the n-loop QCD contribution to the total $e^{+}$ $e^{-}$ annihilation cross section

Geoffrey B. West

Phys. Rev. Lett. 67, 1388 (1991) - Published 9 September, 1991

Nuclear Physics

Nuclear forces and quark degrees of freedom

R. Vinh Mau, C. Semay, B. Loiseau, and M. Lacombe

Phys. Rev. Lett. 67, 1392 (1991) - Published 9 September, 1991

Determination of the radius of the ${}^{11}{Li}$ neutron halo from pion double charge exchange

W. R. Gibbs and A. C. Hayes

Phys. Rev. Lett. 67, 1395 (1991) - Published 9 September, 1991

Atomic, Molecular, and Optical Physics

Two-photon bound state in self-focusing media

Raymond Y. Chiao, Ivan H. Deutsch, and John C. Garrison

Phys. Rev. Lett. 67, 1399 (1991) - Published 9 September, 1991

Generalized relativistic variational calculations for hydrogenic atoms in arbitrary magnetic fields

S. P. Goldman and Zonghua Chen

Phys. Rev. Lett. 67, 1403 (1991) - Published 9 September, 1991

Differential cross sections for the 3s-3p excitation of sodiumlike ${Ar}^{7 +}$ ions by electron impact

B. A. Huber, Ch. Ristori, P. A. Hervieux, M. Maurel, C. Guet, and H. J. Andrä

Phys. Rev. Lett. 67, 1407 (1991) - Published 9 September, 1991

Subharmonic pumping of a Josephson-parametric amplifier and the pitchfork instability

R. Movshovich, B. Yurke, A. D. Smith, and A. H. Silver

Phys. Rev. Lett. 67, 1411 (1991) - Published 9 September, 1991

Suppression of ionization in superintense fields without dichotomy

V. C. Reed, P. L. Knight, and K. Burnett

Phys. Rev. Lett. 67, 1415 (1991) - Published 9 September, 1991

Exchange energy of $H_{2}^{+}$ calculated from polarization perturbation theory and the Holstein-Herring method

T. C. Scott, A. Dalgarno, and John D. Morgan, III

Phys. Rev. Lett. 67, 1419 (1991) - Published 9 September, 1991

Nonlinear Dynamics, Fluid Dynamics, Classical Optics, Etc.

Large infrared nonlinear optical response of $C_{60}$

W. J. Blau, H. J. Byrne, D. J. Cardin, T. J. Dennis, J. P. Hare, H. W. Kroto, R. Taylor, and D. R. M. Walton

Phys. Rev. Lett. 67, 1423 (1991) - Published 9 September, 1991

Measurement of the quantum phase by photon counting

J. W. Noh, A. Fougères, and L. Mandel

Phys. Rev. Lett. 67, 1426 (1991) - Published 9 September, 1991

Long waves in parallel flow in Hele-Shaw cells

M. Zeybek and Y. C. Yortsos

Phys. Rev. Lett. 67, 1430 (1991) - Published 9 September, 1991

Plasma and Beam Physics

Stimulated Compton scattering from preformed underdense plasmas

W. P. Leemans, C. E. Clayton, K. A. Marsh, and C. Joshi

Phys. Rev. Lett. 67, 1434 (1991) - Published 9 September, 1991

Edge electrostatic fluctuations and transport in a reversed-field pinch

T. D. Rempel, C. W. Spragins, S. C. Prager, S. Assadi, D. J. Den Hartog, and S. Hokin

Phys. Rev. Lett. 67, 1438 (1991) - Published 9 September, 1991

Condensed Matter: Structure, Etc.

Determination of the liquid-crystal surface elastic constant $K_{24}$

D. W. Allender, G. P. Crawford, and J. W. Doane

Phys. Rev. Lett. 67, 1442 (1991) - Published 9 September, 1991

Excited states in ${}^{4}{He}$ described by a shadow wave function

W. Wu, S. A. Vitiello, L. Reatto, and M. H. Kalos

Phys. Rev. Lett. 67, 1446 (1991) - Published 9 September, 1991

Experimental study of diffusion and segregation in a Si-( ${Ge}_{x}$ ${Si}_{1 - x}$ ) heterostructure

S. M. Hu, D. C. Ahlgren, P. A. Ronsheim, and J. O. Chu

Phys. Rev. Lett. 67, 1450 (1991) - Published 9 September, 1991

Structure of the (√3 × √3 )R30° Ag/Si(111) surface from first-principles calculations

Y. G. Ding, C. T. Chan, and K. M. Ho

Phys. Rev. Lett. 67, 1454 (1991) - Published 9 September, 1991

Condensed Matter: Electronic Properties, Etc.

Effect of anisotropy on a short-range ±J Heisenberg spin glass in three dimensions

F. Matsubara, T. Iyota, and S. Inawashiro

Phys. Rev. Lett. 67, 1458 (1991) - Published 9 September, 1991

Vortices and anyons

N. S. Manton

Phys. Rev. Lett. 67, 1462 (1991) - Published 9 September, 1991

Cross-Disciplinary Physics

Chain-length dependence of the electrophoretic mobility in random gels

Evangelia Arvanitidou and David Hoagland

Phys. Rev. Lett. 67, 1464 (1991) - Published 9 September, 1991

COMMENTS

Comment on ‘‘Orientational ordering transition in solid $C_{60}$ ’’

Ravi Sachidanandam and A. B. Harris

Phys. Rev. Lett. 67, 1467 (1991) - Published 9 September, 1991

Heiney et al. reply

P. A. Heiney, J. E. Fischer, A. R. McGhie, W. A. Romanow, A. M. Denenstein, J. P. McCauley, Jr., A. B. Smith, III, and D. E. Cox

Phys. Rev. Lett. 67, 1468 (1991) - Published 9 September, 1991

Comment on ‘‘Microscopic theory for dilute quadrupole glasses’’

R. O. Pohl and M. Meissner

Phys. Rev. Lett. 67, 1469 (1991) - Published 9 September, 1991

Klein replies

Michael W. Klein

Phys. Rev. Lett. 67, 1470 (1991) - Published 9 September, 1991

Comment on ‘‘Charge-density-wave structure in ${NbSe}_{3}$ determined by scanning tunneling microscopy’’

S. Van Smaalen, J. L. de Boer, P. Coppens, and H. Graafsma

Phys. Rev. Lett. 67, 1471 (1991) - Published 9 September, 1991

Dai, Slough, and Coleman reply

Zhenzi Dai, C. G. Slough, and R. V. Coleman

Phys. Rev. Lett. 67, 1472 (1991) - Published 9 September, 1991

Comment on ‘‘Pinning forces and lower critical fields in ${YBa}_{2}$ ${Cu}_{3}$ $O_{7}$ crystals: Temperature dependence and anisotropy’’

K. Andres and B. S. Chandrasekhar

Phys. Rev. Lett. 67, 1473 (1991) - Published 9 September, 1991

Wu and Sridhar reply

Dong-Ho Wu and S. Sridhar

Phys. Rev. Lett. 67, 1474 (1991) - Published 9 September, 1991

ERRATA

Diffusion and Segregation in Inhomogeneous Media and the ${Ge}_{x} {Si}_{1 - x}$ Heterostructure

S. M. Hu

Phys. Rev. Lett. 67, 1475 (1991) - Published 9 September, 1991

Breathing Vortex Solitons in Nonrelativistic Chern-Simons Gauge Theory

Z. F. Ezawa, M. Hotta, and A. Iwazaki

Phys. Rev. Lett. 67, 1475 (1991) - Published 9 September, 1991

Oscillations of the Exchange in Magnetic Multilayers as an Analog of de Haas-van Alphen Effect

D. M. Edwards, J. Mathon, R. B. Muniz, and M. S. Phan

Phys. Rev. Lett. 67, 1476 (1991) - Published 9 September, 1991

Hydrogen in the Submillikelvin Regime: Sticking Probability on Superfluid ${}^{4}{He}$

John M. Doyle, Jon C. Sandberg, Ite A. Yu, Claudio L. Cesar, Daniel Kleppner, and Thomas J. Greytak

Phys. Rev. Lett. 67, 1476 (1991) - Published 9 September, 1991

Origin of the First Sharp Diffraction Peak in the Structure Factor of Covalent Glasses

S. R. Elliott

Phys. Rev. Lett. 67, 1477 (1991) - Published 9 September, 1991

Erratum: New low-energy crystal structure for silicon [Phys. Rev. Lett. 67, 715 (1991)]

L. L. Boyer, Efthimiois Kaxiras, J. L. Feldman, J. Q. Broughton, and M. J. Mehl

Phys. Rev. Lett. 67, 1477 (1991) - Published 9 September, 1991