Reviews of Modern Physics

The Abundance of Oxygen in the Sun

I. S. Bowen

Rev. Mod. Phys. 20, 109 (1948) - Published 1 January, 1948

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The forbidden O I lines at $λ λ 5577$ , 6300, and 6363 appear as faint absorption lines in the solar spectrum. Measurements of the equivalent widths indicate that the reversing layer has 7× $10^{20}$ oxygen atoms per square centimeter. Comparison with the equivalent widths of the infra-red permitted lines yields an excitation temperature of 5200° for oxygen. The possibility of using forbidden lines for determining the abundance of other light elements is discussed.

Robert Andrews Millikan as Physicist and Teacher

Paul S. Epstein

Rev. Mod. Phys. 20, 10 (1948) - Published 1 January, 1948

The Genesis of the National Research Council and Millikan's World War I Work

Frank B. Jewett

Rev. Mod. Phys. 20, 1 (1948) - Published 1 January, 1948

The Relativity Effect in Planetary Motions

G. M. Clemence

Rev. Mod. Phys. 19, 361 (1947) - Published 1 October, 1947

Least-Squares' Fitting of Data by Means of Polynomials

Raymond T. Birge and J. W. Weinberg

Rev. Mod. Phys. 19, 298 (1947) - Published 1 October, 1947

Neutron Cross Sections of the Elements A Compilation

H. H. Goldsmith, H. W. Ibser, and B. T. Feld

Rev. Mod. Phys. 19, 259 (1947) - Published 1 October, 1947

Semi-Empirical Theory of the Nuclear Energy Surface

Eugene Feenberg

Rev. Mod. Phys. 19, 239 (1947) - Published 1 July, 1947

Theory of the Slowing Down of Neutrons by Elastic Collision with Atomic Nuclei

Robert E. Marshak

Rev. Mod. Phys. 19, 185 (1947) - Published 1 July, 1947

The Interaction of Electrons and an Electromagnetic Field

C. Jayaratnam Eliezer

Rev. Mod. Phys. 19, 147 (1947) - Published 1 July, 1947

The Use of Deuterium in the Analysis of Vibrational Spectra

Frederick Halverson

Rev. Mod. Phys. 19, 87 (1947) - Published 1 April, 1947

The Interaction of $γ$ -Rays With Matter and the Spectroscopy of $γ$ -Radiation

G. D. Latyshev

Rev. Mod. Phys. 19, 132 (1947) - Published 1 April, 1947

Magnetism

R. M. Bozorth

Rev. Mod. Phys. 19, 29 (1947) - Published 1 January, 1947

Average Energy of Beta-Rays Emitted by Radioactive Isotopes

L. D. Marinelli, R. F. Brinckerhoff, and G. J. Hine

Rev. Mod. Phys. 19, 25 (1947) - Published 1 January, 1947

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For those radio elements whose beta-ray spectra have been adequately investigated, the average kinetic energy ${\bar{E}}_{β}$ is computed by graphical methods. ${\bar{E}}_{β}$ is calculated also as a function of the atomic number $Z$ and the spectral limit $E_{o}$ by means of Fermi's theory for allowed transitions, and compared to these experimental results. It is found that only the well-known experimental values of ${\bar{E}}_{β}$ for the forbidden spectrum of RaE deviates very markedly from the calculated one.

The Neutron-Hydrogen Mass Difference and the Neutron Mass

W. E. Stephens

Rev. Mod. Phys. 19, 19 (1947) - Published 1 January, 1947

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Data in the literature leading to the neutron-hydrogen mass difference and the neutron mass are summarized. The disintegration energy of the deuteron together with the HH-D mass spectroscopic doublet separation apparently yields the best value of $n - H = 0.755 \pm 0.016$ Mev and a neutron mass of 1.008,941±0.000,02 mass units. Other transmutation-radioactivity cycles check this value. Several inconsistencies in these data and their possible explanation are pointed out. Experiments of interest for improvement in accuracy and reliability of these values are noted.

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The Abundance of Oxygen in the Sun

Robert Andrews Millikan as Physicist and Teacher

The Genesis of the National Research Council and Millikan's World War I Work

The Relativity Effect in Planetary Motions

Least-Squares' Fitting of Data by Means of Polynomials

Neutron Cross Sections of the Elements A Compilation

Semi-Empirical Theory of the Nuclear Energy Surface

Theory of the Slowing Down of Neutrons by Elastic Collision with Atomic Nuclei

The Interaction of Electrons and an Electromagnetic Field

The Use of Deuterium in the Analysis of Vibrational Spectra

The Interaction of $γ$ -Rays With Matter and the Spectroscopy of $γ$ -Radiation

Magnetism

Average Energy of Beta-Rays Emitted by Radioactive Isotopes

The Neutron-Hydrogen Mass Difference and the Neutron Mass

Erratum

Recent Research in Meson Theory

Nuclei Formed in Fission: Decay Characteristics, Fission Yields, and Chain Relationships

Microwave Electronics

The Elastic Constants of Anisotropic Materials

Color Centers in Alkali Halide Crystals

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