Volume 26, Issue 6

8 February 1971

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LETTERS

Atoms, Molecules, and Related Topics

dc-Induced Optical Second-Harmonic Generation in the Inert Gases

R. S. Finn and J. F. Ward

Phys. Rev. Lett. 26, 285 (1971) - Published 8 February, 1971

Precision Infrared Zeeman Spectra of C $H_{4}$ Studied by Laser-Saturated Absorption

E. E. Uzgiris, J. L. Hall, and R. L. Barger

Phys. Rev. Lett. 26, 289 (1971) - Published 8 February, 1971

Atoms, Nuclei, and Particles in Matter

Pulse Propagation in a High-Gain Medium

Lee Casperson and Amnon Yariv

Phys. Rev. Lett. 26, 293 (1971) - Published 8 February, 1971

Plasmas, Fluids, Thermodynamics, and Related Topics

Force-Free Configuration of a High-Intensity Electron Beam

S. Yoshikawa

Phys. Rev. Lett. 26, 295 (1971) - Published 8 February, 1971

Density of He II in Superfluid Flow

J. S. Rosenshein, J. Taube, and J. A. Titus

Phys. Rev. Lett. 26, 298 (1971) - Published 8 February, 1971

Comments on Long-Wavelength Excitations and Structure Functions in the Theory of Liquid ${}^{4}{He}$ at $T = 0$

E. Feenberg

Phys. Rev. Lett. 26, 301 (1971) - Published 8 February, 1971

Extension of the Lee-Yang Circle Theorem

David Ruelle

Phys. Rev. Lett. 26, 303 (1971) - Published 8 February, 1971

Solids

Compensation of the Paramagnetic Effect on $H_{c 2}$ by Magnetic Impurities

Ø. Fischer, H. Jones, G. Bongi, C. Frei, and A. Treyvaud

Phys. Rev. Lett. 26, 305 (1971) - Published 8 February, 1971

Experimental Deperturbation of the $b {}^{1}Π_{u} \leftarrow X {}^{1}Σ_{g}^{+}$ Transition of $N_{2}$ in the Solid State, Pure and Trapped in Ne and C $F_{4}$ Matrices at Low Temperature

Etienne Boursey and Jean-Yves Roncin

Phys. Rev. Lett. 26, 308 (1971) - Published 8 February, 1971

New Analysis of Direct Exciton Transitions: Application to GaP

D. D. Sell and P. Lawaetz

Phys. Rev. Lett. 26, 311 (1971) - Published 8 February, 1971

Effect of a Vacancy on the Jahn-Teller-Distorted $Γ_{4}^{-}$ Excited States in KI: ${Sn}^{2 +}$ as Observed in Polarized Luminescence

Atsuo Fukuda

Phys. Rev. Lett. 26, 314 (1971) - Published 8 February, 1971

Electron-Spin-Resonance Measurements of the Spin Susceptibility of Heavily Doped $n$ -Type Silicon

J. D. Quirt and J. R. Marko

Phys. Rev. Lett. 26, 318 (1971) - Published 8 February, 1971

X-Ray Topographic Observation of Antiferromagnetic Domain Boundaries in Chromium

Sukeaki Hosoya and Masami Ando

Phys. Rev. Lett. 26, 321 (1971) - Published 8 February, 1971

Electric Quadrupole Coupling in $α - F e$

J. J. Spijkerman, J. C. Travis, D. N. Pipkorn, and C. E. Violet

Phys. Rev. Lett. 26, 323 (1971) - Published 8 February, 1971

Optical Model for Proton Scattering from ${}^{40}{Ca}$

G. L. Thomas and B. C. Sinha

Phys. Rev. Lett. 26, 325 (1971) - Published 8 February, 1971

Small-Angle $j$ Dependence of ( $α, p$ ) Reactions

J. E. Glenn, C. D. Zafiratos, and C. S. Zaidins

Phys. Rev. Lett. 26, 328 (1971) - Published 8 February, 1971

Elementary Particles and Fields

Axisymmetric Black Hole Has Only Two Degrees of Freedom

B. Carter

Phys. Rev. Lett. 26, 331 (1971) - Published 8 February, 1971

Evidence for a Narrow $N^{*} (1470)$

Z. Ming Ma and Eugene Colton

Phys. Rev. Lett. 26, 333 (1971) - Published 8 February, 1971

Measurement of the Polarization Parameter in Backward $π^{+} p$ Elastic Scattering at 1.60, 1.80, 2.11, and 2.31 $\frac{GeV}{c}$

G. Burleson, D. Hill, S. Kato, P. F. M. Koehler, T. B. Novey, A. Yokosawa, D. Eartly, K. Pretzl, B. Barnett, A. Laasanen, and P. Steinberg

Phys. Rev. Lett. 26, 338 (1971) - Published 8 February, 1971

$γ n$ Partial Cross Sections up to 12 GeV and the Isovector-Isoscalar Interference

G. Alexander, I. Bar-Nir, S. Dagan, J. Gandsman, J. Grunhaus, A. Levy, and Y. Oren

Phys. Rev. Lett. 26, 340 (1971) - Published 8 February, 1971

Momentum-Transfer Dependence in Reactions of the Type $A + p \to Δ^{+ +} + A + π$

T. Ferbel, P. Slattery, and B. Werner

Phys. Rev. Lett. 26, 344 (1971) - Published 8 February, 1971

Physical Review Letters