Volume 27, Issue 5

2 August 1971

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Editorial

Justification for Letters

George L. Trigg

Phys. Rev. Lett. 27, 225 (1971) - Published 2 August, 1971

LETTERS

Atoms, Molecules, and Related Topics

Temporary Formation of $H_{2}^{-}$ above the $H_{2}^{+}$ Threshold by Electron Impact

D. E. Golden

Phys. Rev. Lett. 27, 227 (1971) - Published 2 August, 1971

Small-Angle Charge Exchange in ${He}^{+}$ + $N_{2}$ Collisions

S. M. Fernandez, F. J. Eriksen, and E. Pollack

Phys. Rev. Lett. 27, 230 (1971) - Published 2 August, 1971

Theory of Pure Rotational Transitions in the Vibronic Ground State of Methane

Kenneth Fox

Phys. Rev. Lett. 27, 233 (1971) - Published 2 August, 1971

Atoms, Nuclei, and Particles in Matter

Some Consequences of Pump Coherence on Energy Exchange in Nonlinear Optical Processes

B. Crosignani, U. Ganiel, S. Solimeno, and A. Yariv

Phys. Rev. Lett. 27, 237 (1971) - Published 2 August, 1971

Plasmas, Fluids, Thermodynamics, and Related Topics

Study of Heat Diffusion in Transparent Media by Means of a Thermal-Lens Effect

P. Calmettes and C. Làj

Phys. Rev. Lett. 27, 239 (1971) - Published 2 August, 1971

Correlation Between Acoustic and Dielectric Relaxation Times in Liquids

S. K. Kor and S. C. Deorani

Phys. Rev. Lett. 27, 242 (1971) - Published 2 August, 1971

Solids

Effect of Short-Wavelength Components of the Electronic Polarizability on the Transition Temperature of Superconductors

B. T. Matthias, H. Suhl, and C. S. Ting

Phys. Rev. Lett. 27, 245 (1971) - Published 2 August, 1971

Differential Second-Order Raman Spectroscopy

Y. Yacoby, I. Wagner, J. Bodenheimer, and W. Low

Phys. Rev. Lett. 27, 248 (1971) - Published 2 August, 1971

Determination of Surface States at Clean, Cleaved Silicon Surfaces from Photoconductivity

W. Müller and W. Mönch

Phys. Rev. Lett. 27, 250 (1971) - Published 2 August, 1971

Surface Vibrations of Silicon Detected by Low-Energy Electron Spectroscopy

H. Ibach

Phys. Rev. Lett. 27, 253 (1971) - Published 2 August, 1971

Convective and Absolute Instabilities in Semiconductors Exhibiting Negative Differential Mobility

P. Guéret

Phys. Rev. Lett. 27, 256 (1971) - Published 2 August, 1971

Deduction of Band Structure from Elastic Tunneling Studies

S. L. Sarnot and P. K. Dubey

Phys. Rev. Lett. 27, 259 (1971) - Published 2 August, 1971

Excitons in Mott-Hubbard Insulators

S. Doniach, B. J. Roulet, and Michael E. Fisher

Phys. Rev. Lett. 27, 262 (1971) - Published 2 August, 1971

Parallel Nature of the $Λ_{1} - Λ_{3}$ Energy Bands in Germanium

Stephen Koeppen, Paul Handler, and Stephen Jasperson

Phys. Rev. Lett. 27, 265 (1971) - Published 2 August, 1971

Nuclei

Spectrum of the Reaction ${}^{208}{Pb} (n, γ) {}^{209}{Pb}$ and Semidirect Capture Theory

I. Bergqvist, D. Drake, and D. K. McDaniels

Phys. Rev. Lett. 27, 269 (1971) - Published 2 August, 1971

Bremsstrahlung in Proton- $α$ -Particle Scattering

W. Wölfli, J. Hall, and R. Müller

Phys. Rev. Lett. 27, 271 (1971) - Published 2 August, 1971

Elementary Particles and Fields

Final-State Interactions in Nonleptonic Hyperon Decays

J. H. Reid and N. N. Trofimenkoff

Phys. Rev. Lett. 27, 274 (1971) - Published 2 August, 1971

Explanation of Excess High-Momentum Spectators in High-Energy Deuteron-Breakup Reactions

Nathan W. Dean

Phys. Rev. Lett. 27, 276 (1971) - Published 2 August, 1971

Deep Inelastic Scattering of Electrons on a Photon Target

S. J. Brodsky, Toichiro Kinoshita, and Hidezumi Terazawa

Phys. Rev. Lett. 27, 280 (1971) - Published 2 August, 1971

Experimental Evidence for a High-Mass Vector Meson

A. Benvenuti, D. Cline, R. Rutz, D. D. Reeder, and V. R. Scherer

Phys. Rev. Lett. 27, 283 (1971) - Published 2 August, 1971

Physical Review Letters