Volume 68, Issue 4

27 January 1992

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LETTERS

General Physics

Curvature distribution of chaotic quantum systems: Universality and nonuniversality

T. Takami and H. Hasegawa

Phys. Rev. Lett. 68, 419 (1992) - Published 27 January, 1992

Bubble model and correlation functions in restricted geometry

D. B. Abraham, N. M. Švrakić, and P. J. Upton

Phys. Rev. Lett. 68, 423 (1992) - Published 27 January, 1992

Direct test for determinism in a time series

Daniel T. Kaplan and Leon Glass

Phys. Rev. Lett. 68, 427 (1992) - Published 27 January, 1992

Gravitation and Astrophysics

Knot invariants as nondegenerate quantum geometries

Bernd Brügmann, Rodolfo Gambini, and Jorge Pullin

Phys. Rev. Lett. 68, 431 (1992) - Published 27 January, 1992

Elementary Particles and Fields

Multigrid acceleration for asymptotically free theories

Martin Hasenbusch and Steffen Meyer

Phys. Rev. Lett. 68, 435 (1992) - Published 27 January, 1992

Chromoelectric dipole moments of heavy quarks and purely gluonic CP violating operators

Darwin Chang, Thomas W. Kephart, Wai-Yee Keung, and Tzu Chiang Yuan

Phys. Rev. Lett. 68, 439 (1992) - Published 27 January, 1992

Upper bounds on lepton-number violating meson decays

Laurence S. Littenberg and Robert E. Shrock

Phys. Rev. Lett. 68, 443 (1992) - Published 27 January, 1992

Lower limit on the top-quark mass from events with two leptons in pp¯ collisions at √s =1.8 TeV

F. Abe et al.

Phys. Rev. Lett. 68, 447 (1992) - Published 27 January, 1992

Nuclear dependence of high- $x_{t}$ hadron and high-τ hadron-pair production in p-A interactions at √s =38.8 GeV

P. B. Straub et al.

Phys. Rev. Lett. 68, 452 (1992) - Published 27 January, 1992

Search for three-photon final-state resonances in low-energy $e^{+}$ $e^{-}$ scattering

M. Skalsey and J. J. Kolata

Phys. Rev. Lett. 68, 456 (1992) - Published 27 January, 1992

Nuclear Physics

‘‘Invisible’’ decay of superdeformed states

P. B. Semmes, I. Ragnarsson, and S. Åberg

Phys. Rev. Lett. 68, 460 (1992) - Published 27 January, 1992

Atomic, Molecular, and Optical Physics

Realization of a continuous-wave, two-photon optical laser

Daniel J. Gauthier, Qilin Wu, S. E. Morin, and T. W. Mossberg

Phys. Rev. Lett. 68, 464 (1992) - Published 27 January, 1992

Dynamic tunneling ionization of excited hydrogen atoms: A precise experiment versus theories

B. E. Sauer, S. Yoakum, L. Moorman, P. M. Koch, D. Richards, and P. A. Dando

Phys. Rev. Lett. 68, 468 (1992) - Published 27 January, 1992

Measurement-induced diffraction and interference of atoms

Pippa Storey, Matthew Collett, and Daniel Walls

Phys. Rev. Lett. 68, 472 (1992) - Published 27 January, 1992

Nonlinear Dynamics, Fluid Dynamics, Classical Optics, Etc.

Scanning plasmon near-field microscope

M. Specht, J. D. Pedarnig, W. M. Heckl, and T. W. Hänsch

Phys. Rev. Lett. 68, 476 (1992) - Published 27 January, 1992

Plasma and Beam Physics

Electron distribution anisotropy in laser-produced plasmas from x-ray line polarization measurements

J. C. Kieffer, J. P. Matte, H. Pépin, M. Chaker, Y. Beaudoin, T. W. Johnston, C. Y. Chien, S. Coe, G. Mourou, and J. Dubau

Phys. Rev. Lett. 68, 480 (1992) - Published 27 January, 1992

Test of the Landau cutoff of stimulated Raman scattering spectra as an electron-temperature diagnostic in laser-produced plasmas

B. La Fontaine, D. M. Villeneuve, H. A. Baldis, R. P. Drake, and Kent Estabrook

Phys. Rev. Lett. 68, 484 (1992) - Published 27 January, 1992

Condensed Matter: Structure, Etc.

Collapse from linear to branched polymer behavior

E. Orlandini, F. Seno, A. L. Stella, and M. C. Tesi

Phys. Rev. Lett. 68, 488 (1992) - Published 27 January, 1992

Novel phase behavior in normal alkanes

E. B. Sirota, H. E. King, Jr., G. J. Hughes, and W. K. Wan

Phys. Rev. Lett. 68, 492 (1992) - Published 27 January, 1992

Accumulation of structure combination branching processes in betaine calcium chloride dihydrate

S. Kruip, G. Schaack, and M. Schmitt-Lewen

Phys. Rev. Lett. 68, 496 (1992) - Published 27 January, 1992

Gamma-ray emission in crystal blocking experiments

R. F. A. Hoernlé, R. W. Fearick, and J. P. F. Sellschop

Phys. Rev. Lett. 68, 500 (1992) - Published 27 January, 1992

Femtosecond time-resolved surface reaction: Desorption of Co from Cu(111) in <325 fsec

J. A. Prybyla, H. W. K. Tom, and G. D. Aumiller

Phys. Rev. Lett. 68, 503 (1992) - Published 27 January, 1992

X-ray scattering study of Ag/Si(111) buried interface structures

Hawoong Hong, R. D. Aburano, D.-S. Lin, Haydn Chen, T.-C. Chiang, P. Zschack, and E. D. Specht

Phys. Rev. Lett. 68, 507 (1992) - Published 27 January, 1992

Negative-curvature fullerene analog of $C_{60}$

David Vanderbilt and J. Tersoff

Phys. Rev. Lett. 68, 511 (1992) - Published 27 January, 1992

Condensed Matter: Electronic Properties, Etc.

Ultrafast nonlinear spectroscopy with chirped optical pulses

Erik T. J. Nibbering, Douwe A. Wiersma, and Koos Duppen

Phys. Rev. Lett. 68, 514 (1992) - Published 27 January, 1992

Bound phonons and DX centers in GaAs under hydrostatic pressure

P. Séguy, M. Zigone, and G. Martinez

Phys. Rev. Lett. 68, 518 (1992) - Published 27 January, 1992

Observation of surface-induced photon fields in the photoemission of 1T- ${TiS}_{2}$

D. Samuelsen, E. Pehlke, W. Schattke, O. Anderson, R. Manzke, and M. Skibowski

Phys. Rev. Lett. 68, 522 (1992) - Published 27 January, 1992

Electron-phonon coupling and superconductivity in alkali-intercalated $C_{60}$ solid

M. Schluter, M. Lannoo, M. Needels, G. A. Baraff, and D. Tománek

Phys. Rev. Lett. 68, 526 (1992) - Published 27 January, 1992

Metallization of the resistivity tensor in ${Bi}_{2}$ ${Sr}_{2}$ ${CaCu}_{2}$ $O_{x}$ through epitaxial intercalation

X.-D. Xiang, W. A. Vareka, A. Zettl, J. L. Corkill, Marvin L. Cohen, N. Kijima, and R. Gronsky

Phys. Rev. Lett. 68, 530 (1992) - Published 27 January, 1992

de Haas–van Alphen effect and Fermi surface of ${YBa}_{2}$ ${Cu}_{3}$ $O_{6.97}$

C. M. Fowler, B. L. Freeman, W. L. Hults, J. C. King, F. M. Mueller, and J. L. Smith

Phys. Rev. Lett. 68, 534 (1992) - Published 27 January, 1992

Aspects of the phase diagram of the two-dimensional t-J model

W. O. Putikka, M. U. Luchini, and T. M. Rice

Phys. Rev. Lett. 68, 538 (1992) - Published 27 January, 1992

Cross-Disciplinary Physics

Simulation of megabase DNA undergoing gel electrophoresis

T. A. J. Duke and J. L. Viovy

Phys. Rev. Lett. 68, 542 (1992) - Published 27 January, 1992

COMMENTS

Avalanches related to kinetic roughening

D. E. Wolf, J. Kertész, and S. S. Manna

Phys. Rev. Lett. 68, 546 (1992) - Published 27 January, 1992

Obukhov replies

S. P. Obukhov

Phys. Rev. Lett. 68, 547 (1992) - Published 27 January, 1992

Comment on ‘‘Determination of the πNN coupling constant from elastic pion-nucleon scattering data’’

J. Stahov, M. E. Sadler, and V. V. Abaev

Phys. Rev. Lett. 68, 548 (1992) - Published 27 January, 1992

Arndt et al. reply

R. A. Arndt, Z. Li, L. D. Roper, and R. L. Workman

Phys. Rev. Lett. 68, 549 (1992) - Published 27 January, 1992

Comment on ‘‘Evidence for superconductivity in low-temperature–grown GaAs’’

Myron Strongin and D. L. Miller

Phys. Rev. Lett. 68, 550 (1992) - Published 27 January, 1992

Baranowski et al. reply

J. M. Baranowski, Z. Liliental-Weber, W.-F. Yau, and E. R. Weber

Phys. Rev. Lett. 68, 551 (1992) - Published 27 January, 1992