Volume 31, Issue 4

23 July 1973

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LETTERS

Atoms, Molecules, and Related Topics

Time-Resolved Fluorescence from Ba and Ca Excited by a Pulsed Tunable Dye Laser

Peter Schenck, Robert C. Hilborn, and Harold Metcalf

Phys. Rev. Lett. 31, 189 (1973) - Published 23 July, 1973

Experimental Evidence for New Dissociation Channels in Electron-Impact Ionization of $H_{2}$

A. Crowe and J. W. McConkey

Phys. Rev. Lett. 31, 192 (1973) - Published 23 July, 1973

Atoms, Nuclei, and Particles in Matter

Phase Variation in Coherent-Optical-Pulse Propagation

G. L. Lamb, Jr.

Phys. Rev. Lett. 31, 196 (1973) - Published 23 July, 1973

Plasmas, Fluids, Thermodynamics, and Related Topics

Stochastic Ion Heating Due to the Parametric Ion-Acoustic Decay Instability

H. W. Hendel and J. T. Flick

Phys. Rev. Lett. 31, 199 (1973) - Published 23 July, 1973

Parametric Instabilities in Bounded Plasmas

D. Pesme, G. Laval, and R. Pellat

Phys. Rev. Lett. 31, 203 (1973) - Published 23 July, 1973

Argon Shear Viscosity via a Lennard-Jones Potential with Equilibrium and Nonequilibrium Molecular Dynamics

W. T. Ashurst and W. G. Hoover

Phys. Rev. Lett. 31, 206 (1973) - Published 23 July, 1973

Long-Time Behavior of the Velocity Autocorrelation: A Measurement

Yong Wook Kim and Joseph E. Matta

Phys. Rev. Lett. 31, 208 (1973) - Published 23 July, 1973

Parametrically Driven Ion Cyclotron Waves and Intense Ion Heating

T. K. Chu, S. Bernabei, and R. W. Motley

Phys. Rev. Lett. 31, 211 (1973) - Published 23 July, 1973

Solids

Evidence for 870-GHz Phonon Emission from Superconducting Al Tunnel Diodes through Resonant Scattering by Oxygen in Silicon

W. Forkel, M. Welte, and W. Eisenmenger

Phys. Rev. Lett. 31, 215 (1973) - Published 23 July, 1973

Impurity Effect on Flux-Flow Resistivity in Gapless Superconductors

Chia-Ren Hu and Richard S. Thompson

Phys. Rev. Lett. 31, 217 (1973) - Published 23 July, 1973

Two-Photon Photogeneration in Amorphous Selenium

R. C. Enck

Phys. Rev. Lett. 31, 220 (1973) - Published 23 July, 1973

New Phenomena in Excitoa Condensation in Germanium

Thomas K. Lo, Bernard J. Feldman, and C. D. Jeffries

Phys. Rev. Lett. 31, 224 (1973) - Published 23 July, 1973

Diffuse Mössbauer Scattering Applied to Dynamics of Phase Transformations

B. W. Batterman, G. Maracci, A. Merlini, and S. Pace

Phys. Rev. Lett. 31, 227 (1973) - Published 23 July, 1973

Interband Masses of Higher Interband Critical Points in Ge

D. E. Aspnes

Phys. Rev. Lett. 31, 230 (1973) - Published 23 July, 1973

Multipole Waves in Periodic Lattices

U. Fano

Phys. Rev. Lett. 31, 234 (1973) - Published 23 July, 1973

Coulomb Effects on the Gain Spectrum of Semiconductors

W. F. Brinkman and P. A. Lee

Phys. Rev. Lett. 31, 237 (1973) - Published 23 July, 1973

Critical Resistivity near an Order-Disorder Transition

G. A. Thomas, A. B. Giray, and R. D. Parks

Phys. Rev. Lett. 31, 241 (1973) - Published 23 July, 1973

Nuclei

Nuclear Reactions of Silver with 300-GeV Protons

G. English, Y. W. Yu, and N. T. Porile

Phys. Rev. Lett. 31, 244 (1973) - Published 23 July, 1973

Subthreshold Fission Induced by Neutrons on ${}^{238}U$

R. C. Block, R. W. Hockenbury, R. E. Slovacek, E. B. Bean, and D. S. Cramer

Phys. Rev. Lett. 31, 247 (1973) - Published 23 July, 1973

( ${}^{10}B$ , ${}^{7}{Li}$ ) and ( ${}^{10}B$ , ${}^{7}{Be}$ ) Analog Reactions on ${}^{12}C$

K. Nagatani, D. H. Youngblood, R. Kenefick, and J. Bronson

Phys. Rev. Lett. 31, 250 (1973) - Published 23 July, 1973

Experimental Evidence for the Direct Nature of the Reaction ${}^{12}C ({}^{6}{Li}, α) {}^{14}N$ at $E ({}^{6}{Li}) = 33$ MeV

R. L. White, K. W. Kemper, L. A. Charlton, and W. J. Courtney

Phys. Rev. Lett. 31, 254 (1973) - Published 23 July, 1973

Elementary Particles and Fields

$π$ Condensation in Nuclear Matter

A. B. Migdal

Phys. Rev. Lett. 31, 257 (1973) - Published 23 July, 1973

Physical Review Letters