Volume 22, Issue 7

17 February 1969

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LETTERS

Observation of Hyperfine Level Crossing in Stimulated Emission

J. S. Levine, P. A. Bonczyk, and A. Javan

Phys. Rev. Lett. 22, 267 (1969) - Published 17 February, 1969

Optical Orientation of the ${}^{3}P_{0}$ Ground State of ${Pb}^{207}$

Hyatt M. Gibbs, Berken Chang, and Rodney C. Greenhow

Phys. Rev. Lett. 22, 270 (1969) - Published 17 February, 1969

Observation of the Nonsecular Frequency Shift of the NMR Line in Solid ${He}^{3}$

J. M. Homer and M. G. Richards

Phys. Rev. Lett. 22, 273 (1969) - Published 17 February, 1969

Periodic Pulling and Turbulence in a Bounded Plasma

R. H. Abrams, Jr., E. J. Yadlowsky, and H. Lashinsky

Phys. Rev. Lett. 22, 275 (1969) - Published 17 February, 1969

Theory of Dilute Solutionsl of ${He}^{3}$ in Liquid ${He}^{4}$

Chia-Wei Woo, Hing-Tat Tan, and Walter E. Massey

Phys. Rev. Lett. 22, 278 (1969) - Published 17 February, 1969

Raman Scattering by Polaritons in Presence of Electron Plasma in GaAs

C. K. N. Patel and R. E. Slusher

Phys. Rev. Lett. 22, 282 (1969) - Published 17 February, 1969

Cancelation Theorem for Isoelectronic Impurity Binding Energies

J. C. Phillips

Phys. Rev. Lett. 22, 285 (1969) - Published 17 February, 1969

Evidence of Intervalley Scattering of Electrons in the Extrinsic Photoconductivity of $n$ -Type Silicon

A. Onton

Phys. Rev. Lett. 22, 288 (1969) - Published 17 February, 1969

Spin Waves and the Order-Disorder Transition in Chromium

J. Als-Nielsen and O. W. Dietrich

Phys. Rev. Lett. 22, 290 (1969) - Published 17 February, 1969

Observations of Surface Plasmon Excitation by Tunneling Electrons in GaAs-Pb Tunnel Junctions

D. C. Tsui

Phys. Rev. Lett. 22, 293 (1969) - Published 17 February, 1969

Magnetic and Semiconducting Properties of Sm $B_{6}$

A. Menth, E. Buehler, and T. H. Geballe

Phys. Rev. Lett. 22, 295 (1969) - Published 17 February, 1969

Observation of Librational Waves in the Ordered State of Solid Hydrogen and Deuterium by Raman Scattering

Walter N. Hardy, Isaac F. Silvera, and John P. McTague

Phys. Rev. Lett. 22, 297 (1969) - Published 17 February, 1969

Charge-Exchange Coupling in ${}^{98}{Mo}$ + $p$ Reactions

R. A. Hinrichs, G. W. Phillips, J. G. Cramer, and H. Wieman

Phys. Rev. Lett. 22, 301 (1969) - Published 17 February, 1969

Correlations Between ( $n, γ$ ) and ( $d, p$ ) Reactions on $N = 82$ Nuclei

M. A. J. Mariscotti, J. A. Moragues, W. Gelletly, and W. R. Kane

Phys. Rev. Lett. 22, 303 (1969) - Published 17 February, 1969

Upper Limits to the Intensity of Background Radiation at $λ = 1.32, 0.559, AND 0.359$ mm

V. J. Bortolot, Jr., J. F. Clauser, and P. Thaddeus

Phys. Rev. Lett. 22, 307 (1969) - Published 17 February, 1969

Crab Nebula Pulsar NPO527

Edward C. Reifenstein, III, William D. Brundage, and David H. Staelin

Phys. Rev. Lett. 22, 311 (1969) - Published 17 February, 1969

Critical Examination of Direct Muon Production

W. R. Sheldon, W. G. Cantrell, and N. M. Duller

Phys. Rev. Lett. 22, 312 (1969) - Published 17 February, 1969

Study of the Di-Pion from the Reaction $π^{-} + p \to n + π^{0} + π^{0}$ at 1.53 and 1.27 GeV/c Incident Momenta

M. Feldman, W. Frati, R. Gleeson, J. Halpern, M. Nussbaum, and S. Richert

Phys. Rev. Lett. 22, 316 (1969) - Published 17 February, 1969

Physical Review Letters