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Physical Review Letters

Volume 59, Issue 24

14 December 1987

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LETTERS

Elementary Particles and Fields

Measurements of the $Σ_{c}^{0} - {Λ_{c}}^{+}$ and ${Σ_{c}}^{+ +} - {Λ_{c}}^{+}$ Mass Differences

M. Diesburg, R. Ladbury, M. Binkley, F. Bossi, J. Butler, P. Coteus, J. P. Cumalat, M. DiCorato, J. Enagonio, J. Filaseta, P. L. Frabetti, I. Gaines, P. Garbincius, M. Gormley, J. Haggerty, D. J. Harding, T. Kroc, P. Lebrun, P. F. Manfredi, J. Peoples, A. Sala, C. Shipbaugh, J. Slaughter, and J. Wiss

Phys. Rev. Lett. 59, 2711 (1987) - Published 14 December, 1987

Search for Spontaneous Conversion of Muonium to Antimuonium

B. Ni, K. -P. Arnold, F. Chmely, V. W. Hughes, S. H. Kettell, Y. Kuang, J. Markey, B. E. Matthias, H. Orth, H. R. Schaefer, K. Woodle, M. D. Cooper, C. M. Hoffman, G. E. Hogan, R. E. Mischke, L. E. Piilonen, R. A. Williams, M. Eckhause, P. Guss, J. Kane, J. Reidy, and G. zu Putlitz

Phys. Rev. Lett. 59, 2716 (1987) - Published 14 December, 1987

Nuclear Physics

Fragment Flow in Nuclear Collisions

K. G. R. Doss, H. -A. Gustafsson, H. Gutbrod, J. W. Harris, B. V. Jacak, K. -H. Kampert, B. Kolb, A. M. Poskanzer, H. -G. Ritter, H. R. Schmidt, L. Teitelbaum, M. Tincknell, S. Weiss, and H. Wieman

Phys. Rev. Lett. 59, 2720 (1987) - Published 14 December, 1987

Effect of Surface Fluctuations on the Nuclear Density

F. Barranco and R. A. Broglia

Phys. Rev. Lett. 59, 2724 (1987) - Published 14 December, 1987

Atomic, Molecular, and Optical Physics

Nonthermal Intramolecular Vibrational Energy Distribution in Infrared-Multiphoton-Excited C $F_{2}$ ${Cl}_{2}$

Kuei-Hsien Chen, Jyhpyng Wang, and Eric Mazur

Phys. Rev. Lett. 59, 2728 (1987) - Published 14 December, 1987

Radiative Decay Rates in ${Hg}^{+}$ from Observations of Quantum Jumps in a Single Ion

Wayne M. Itano, J. C. Bergquist, Randall G. Hulet, and D. J. Wineland

Phys. Rev. Lett. 59, 2732 (1987) - Published 14 December, 1987

Strong Correlation and Alignment near the Be $1 s$ Photoionization Threshold

Manfred O. Krause and C. Denise Caldwell

Phys. Rev. Lett. 59, 2736 (1987) - Published 14 December, 1987

Fundamental Phenomenology and Applications

Bifurcation of Quasiperiodic and Nonstationary Patterns under External Forcing

L. M. Pismen

Phys. Rev. Lett. 59, 2740 (1987) - Published 14 December, 1987

Observation of Envelope Solitons in Solids

J. Wu, J. Wheatley, S. Putterman, and I. Rudnick

Phys. Rev. Lett. 59, 2744 (1987) - Published 14 December, 1987

Fluids, Plasmas, and Electric Discharges

Enhanced Velocity Diffusion along Electron-Cyclotron-Resonance Heating Characteristics Observed in Hot-Electron Energy Spectra in the Plasma Loss Cone

T. Saito, I. Katanuma, Y. Kiwamoto, T. Kariya, and S. Miyoshi

Phys. Rev. Lett. 59, 2748 (1987) - Published 14 December, 1987

Nonlinear Interaction between a Warm Electron Beam and a Single Wave

S. I. Tsunoda, F. Doveil, and J. H. Malmberg

Phys. Rev. Lett. 59, 2752 (1987) - Published 14 December, 1987

Condensed Matter: Structure, Etc.

Order-Disorder Transition of Au and Pt (110) Surfaces: The Significance of Relaxations and Vibrations

Murray S. Daw and S. M. Foiles

Phys. Rev. Lett. 59, 2756 (1987) - Published 14 December, 1987

Defect-Induced Crystal-to-Amorphous Transition in an Atomistic Simulation Model

Horngming Hsieh and Sidney Yip

Phys. Rev. Lett. 59, 2760 (1987) - Published 14 December, 1987

Theory of Adsorbate-Induced Surface Relaxations: Hydrogen on Cu(110)

K. W. Jacobsen and J. K. Nørskov

Phys. Rev. Lett. 59, 2764 (1987) - Published 14 December, 1987

Effect of Translational Energy on the Chemisorption of $N_{2}$ on Fe(111): Activated Dissociation via a Precursor State

C. T. Rettner and H. Stein

Phys. Rev. Lett. 59, 2768 (1987) - Published 14 December, 1987

Condensed Matter: Electronic Properties, Etc.

Orthorhombic Distortion at the Superconducting Transition in Y ${Ba}_{2}$ ${Cu}_{3}$ $O_{7}$ : Evidence for Anisotropic Pairing

P. M. Horn, D. T. Keane, G. A. Held, J. L. Jordan-Sweet, D. L. Kaiser, F. Holtzberg, and T. M. Rice

Phys. Rev. Lett. 59, 2772 (1987) - Published 14 December, 1987

Ordering and Decomposition in the High-Temperature Superconducting Compound $Y {Ba}_{2} {Cu}_{3} O_{x}$

A. G. Khachaturyan and J. W. Morris, Jr.

Phys. Rev. Lett. 59, 2776 (1987) - Published 14 December, 1987

Bond Asymmetry and High- $T_{c}$ Superconductivity

Daniel C. Mattis and Michael P. Mattis

Phys. Rev. Lett. 59, 2780 (1987) - Published 14 December, 1987

Fractional Quantum Hall Effect at Half-Filled Landau Level in a Multiple-Layer Electron System

Tapash Chakraborty and Pekka Pietiläinen

Phys. Rev. Lett. 59, 2784 (1987) - Published 14 December, 1987

Cr $O_{2}$ —A New Half-Metallic Ferromagnet?

K. P. Kämper, W. Schmitt, G. Güntherodt, R. J. Gambino, and R. Ruf

Phys. Rev. Lett. 59, 2788 (1987) - Published 14 December, 1987

Observation of Direct Multiquantum Vibrational Excitation in Gas-Surface Scattering: N $H_{3}$ on Au(111)

Bruce D. Kay, T. D. Raymond, and Michael E. Coltrin

Phys. Rev. Lett. 59, 2792 (1987) - Published 14 December, 1987

Production of Free Charge Carriers during Fracture of Single-Crystal Silicon

S. C. Langford, D. L. Doering, and J. T. Dickinson

Phys. Rev. Lett. 59, 2795 (1987) - Published 14 December, 1987

Catastrophe Model for Micromagnetics

Marc A. Pinto

Phys. Rev. Lett. 59, 2798 (1987) - Published 14 December, 1987

Capacitance Oscillations in One-Dimensional Electron Systems

T. P. Smith, III, H. Arnot, J. M. Hong, C. M. Knoedler, S. E. Laux, and H. Schmid

Phys. Rev. Lett. 59, 2802 (1987) - Published 14 December, 1987

Observations of Magnetoquantized Interface States by Electron Tunneling in Single-Barrier $n^{-} (InGa) As - InP - n^{+} (InGa) As$ Heterostructures

B. R. Snell, K. S. Chan, F. W. Sheard, L. Eaves, G. A. Toombs, D. K. Maude, J. C. Portal, S. J. Bass, P. Claxton, G. Hill, and M. A. Pate

Phys. Rev. Lett. 59, 2806 (1987) - Published 14 December, 1987

Persistent Photoconductivity in Si-doped ${Al}_{x} {Ga}_{1 - x} As$

Stefan Zukotynski, Paul C. H. Ng, and Andrzej J. Pindor

Phys. Rev. Lett. 59, 2810 (1987) - Published 14 December, 1987

Geophysics, Astronomy, and Astrophysics

Statistical Treatment of Fluctuations in the Gravitational Focusing of Light Due to Stellar Masses within a Gravitational Lens

Shuji Deguchi and William D. Watson

Phys. Rev. Lett. 59, 2814 (1987) - Published 14 December, 1987

COMMENTS

Pole Structures in Nuclear and Particle Physics

D. Morgan and M. R. Pennington

Phys. Rev. Lett. 59, 2818 (1987) - Published 14 December, 1987

Hale, Brown, and Jarmie Reply

G. M. Hale, Ronald E. Brown, and Nelson Jarmie

Phys. Rev. Lett. 59, 2819 (1987) - Published 14 December, 1987

Modification of the Electron-Phonon Interactions in GaAs-GaAlAs Heterojunctions

Marcos H. Degani and Oscar Hipólito

Phys. Rev. Lett. 59, 2820 (1987) - Published 14 December, 1987

Brummell et al. Reply

M. A. Brummell, R. J. Nicholas, M. A. Hopkins, D. R. Leadley, J. J. Harris, and C. T. Foxon

Phys. Rev. Lett. 59, 2821 (1987) - Published 14 December, 1987

Optical Mode in Tilted Hexatics

Helmut R. Brand and Harald Pleiner

Phys. Rev. Lett. 59, 2822 (1987) - Published 14 December, 1987

Comment on "Phase Change during a Cyclic Quantum Evolution"

H. Reinhardt

Phys. Rev. Lett. 59, 2823 (1987) - Published 14 December, 1987

ERRATA

Macroscopic Quantum-Mechanical Contributions to Radiative Polarization in Electron Storage Rings

L. N. Hand and A. Skuja

Phys. Rev. Lett. 59, 2824 (1987) - Published 14 December, 1987