Volume 28, Issue 25

19 June 1972

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LETTERS

Atoms, Molecules, and Related Topics

Lamb-Shift Measurement for the $n = 2$ State of Hydrogenic ${}^{16}O$

M. Leventhal, D. E. Murnick, and H. W. Kugel

Phys. Rev. Lett. 28, 1609 (1972) - Published 19 June, 1972

Measurement of the Lamb Shift in the ${}^{16}O^{7 +}$ Ion

George P. Lawrence, C. Y. Fan, and S. Bashkin

Phys. Rev. Lett. 28, 1612 (1972) - Published 19 June, 1972

Metastable Autoionizing States in Sodiumlike Chlorine

D. J. Pegg, I. A. Sellin, P. M. Griffin, and Winthrop W. Smith

Phys. Rev. Lett. 28, 1615 (1972) - Published 19 June, 1972

Atoms, Nuclei, and Particles in Matter

Observation of Higher-Order Acoustic Paramagnetic-Resonance Transitions in MgO: ${Fe}^{2 +}$

D. I. Bolef, R. G. Leisure, and D. A. Rudy

Phys. Rev. Lett. 28, 1618 (1972) - Published 19 June, 1972

Theory of Higher-Order Acoustic Paramagnetic-Resonance Transitions of Magnetic Ions in Dielectrics

Peter A. Fedders and Charles W. Myles

Phys. Rev. Lett. 28, 1620 (1972) - Published 19 June, 1972

Plasmas, Fluids, Thermodynamics, and Related Topics

Evaporation from Superfluid Helium

Milton W. Cole

Phys. Rev. Lett. 28, 1622 (1972) - Published 19 June, 1972

Numerical Simulation on Plasma Diffusion in Three Dimensions

Hideo Okuda and John M. Dawson

Phys. Rev. Lett. 28, 1625 (1972) - Published 19 June, 1972

New Method for Measuring the Twist Elastic Constant $\frac{K_{22}}{χ_{a}}$ and the Shear Viscosity $\frac{γ_{1}}{χ_{a}}$ for Nematics

P. E. Cladis

Phys. Rev. Lett. 28, 1629 (1972) - Published 19 June, 1972

Solids

Observation of Radiative Decay of Surface Plasmons in Small Silver Particles

Th. Kokkinakis and K. Alexopoulos

Phys. Rev. Lett. 28, 1632 (1972) - Published 19 June, 1972

Magnetic Field Dependence of Cyclotron-Resonance Linewidth in the Quantum Limit

Ernest E. H. Shin, Petros N. Argyres, and Benjamin Lax

Phys. Rev. Lett. 28, 1634 (1972) - Published 19 June, 1972

Zeeman Splitting of Anomalous Shallow Bound States in ZnO

Kenneth J. Button, Daniel R. Cohn, Michael von Ortenbert, Benjamin Lax, E. Mollwo, and R. Helbig

Phys. Rev. Lett. 28, 1637 (1972) - Published 19 June, 1972

Electronic Structure and Kinetics of the Oxidation of Ba and Sr

Kenneth A. Kress and Gerald J. Lapeyre

Phys. Rev. Lett. 28, 1639 (1972) - Published 19 June, 1972

Screening of Wannier Exciton States near the Metal-Insulator Transition

Baruch Raz, Aharon Gedanken, Uzi Even, and Joshua Jortner

Phys. Rev. Lett. 28, 1643 (1972) - Published 19 June, 1972

Direct-Process NMR Relaxation by Spin Waves in a One-Dimensional Antiferromagnet

Peter M. Richards

Phys. Rev. Lett. 28, 1646 (1972) - Published 19 June, 1972

Antiferromagnetic-Resonance Linewidths in Mn $F_{2}$

J. P. Kotthaus and V. Jaccarino

Phys. Rev. Lett. 28, 1649 (1972) - Published 19 June, 1972

Observation of Cooperative Nuclear Magnetic Order in Pr ${Cu}_{2}$ below 54 mK

K. Andres, E. Bucher, J. P. Maita, and A. S. Cooper

Phys. Rev. Lett. 28, 1652 (1972) - Published 19 June, 1972

Nuclei

Neutron-Neutron ${}^{1}S_{0}$ Scattering Parameters from a Kinematically Complete Experiment on the Reaction ${}^{2}H (n, 2 n) H$

B. Zeitnitz, R. Maschuw, P. Suhr, and W. Ebenhöh

Phys. Rev. Lett. 28, 1656 (1972) - Published 19 June, 1972

Selective Excitation of One-, Two-, and Three-Nucleon Configurations in Transfer Reactions Induced by Heavy Ions

D. K. Scott, P. N. Hudson, P. S. Fisher, C. U. Cardinal, N. Anyas-Weiss, A. D. Panagiotou, P. J. Ellis, and B. Buck

Phys. Rev. Lett. 28, 1659 (1972) - Published 19 June, 1972

( ${}^{16}O$ , ${}^{15}N$ ) Reactions on $fp$ -Shell Target Nuclei

G. C. Morrison, H. J. Körner, L. R. Greenwood, and R. H. Siemssen

Phys. Rev. Lett. 28, 1662 (1972) - Published 19 June, 1972

Elementary Particles and Fields

Possible Variation of the Gravitational Constant over the Elements

J. J. Gilvarry and P. M. Muller

Phys. Rev. Lett. 28, 1665 (1972) - Published 19 June, 1972

Origin of the Cosmic Microwave Background Radiation in a Chaotic Universe

M. J. Rees

Phys. Rev. Lett. 28, 1669 (1972) - Published 19 June, 1972

Measurement of $\frac{π^{-}}{π^{+}}$ Ratios in Photoproduction from Deuterium: The Dip Test of an Isotensor Current

T. Fujii, S. Homma, K. Huke, S. Kato, H. Okuno, F. Takasaki, T. Kondo, S. Yamada, I. Endo, and H. Fujii

Phys. Rev. Lett. 28, 1672 (1972) - Published 19 June, 1972

Neutron and Proton Form Factors

C. L. Hammer and T. A. Weber

Phys. Rev. Lett. 28, 1675 (1972) - Published 19 June, 1972

ERRATA

Scattering Theory of Small-Particle Absorption: Cyclotron and Magneto-Plasma Resonance.

F. L. Galeener

Phys. Rev. Lett. 28, 1679 (1972) - Published 19 June, 1972

Physical Review Letters