By Edward U. Condon (auth.), Asim O. Barut, Halis Odabasi, Alwyn van der Merwe (eds.)

E.U. Condon's significant contributions have been in atomic and molecular physics and spectroscopy; his ebook with G.H. Shortley at the conception of Atomic Spectra ruled the sphere of spectroscopy for part a century and is still a useful reference. He additionally performed a tremendous function within the associations of yankee technological know-how. He served for a few years because the editor of stories of recent Physics, and with Hugh Odishaw he edited the nonetheless usual instruction manual of Physics. After global warfare II, Condon turned director of the nationwide Bureau of criteria (now NIST), and helped to make it one of many most excellent study laboratories within the actual sciences on the earth. The Selected medical Papers reprint a few of the most vital contributions Condon made to atomic physics, quantum idea, nuclear physics, condensed-matter physics and different fields. The Selected well known Writings include articles he wrote on technical subject matters for such journals as The American magazine of Physics, technological know-how, and Nature, in addition to reflections on schooling, UFO's, and different topics.

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1 Dennison 2 has also treated the problem by the matrix methods. Reiche has investigated the first-order Stark effect while Manneback has investigated the second-order Stark effect as well. , the perturbation of the energy levels of the top by a magnetic field, has not been hitherto investigated. The results of the calculation of this perturbation are here communicated. The notation here used is that of Kronig and Rabi. The top has two of its moments of inertia equal to A and the third, about the axis of symmetry, equal to C.

Phys. 25, 299 (1924). Mean Free Paths in a Gas Whose Molecules are Attracting Rigid Elastic Spheres EDWARD U. V. VAN AMRINGEt Department of Physics University of California The beautiful results which the founders of the kinetic theory of gases were able to attain by regarding gas molecules simply as rigid elastic spheres have been considerably refined in several directions by theorists who have imagined a gas molecule which exerts a weak attractive force on its fellows. This concept of attracting molecules lies at the basis of van der Waals' pioneer work on the equation of state, and enabled Sutherland to give a theoretical basis to his remarkably accurate equation for the variation of the coefficient of viscosity with the temperature.

B, Coulomb energy of nuclear repulsion. c, Approximate electronic energy curve for interacting electrons. Units: ordinates, 1 = Rydberg constant, abscissas, 1 = radius of first Bohr orbit in hydrogen atom. 37 The Normal State of the Hydrogen Molecule FIGURE 2. Resultant energy curves in H2 + and H 2. a, Burrau's curve for H2 +. b, Curve for H2 for non-interacting electrons. c, Approximate curve for H2 with interacting electrons. The small circle in the crook of curve b, represents the equilibrium position and energy on Hutchisson's classical crossed-orbit model of H 2.

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