A Career In Theoretical Physics by P. W. Anderson PDF

By P. W. Anderson

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Polarizability ellipsoid of the non-isotropic molecule, 22 assumed to be an ellipsoid of rotation. ) 6 is the angle Autler. Column (c) is from Stuart's book. One more problem was computed. The microwave between the axis of the polarizability ellipsoid and the spectrum of oxygen has been measured 26 in some detail. intermolecular distance r. For states separated by microwave frequency dif- This case is even more complicated that the preceding, ferences, the isotropic parts of (19) make no con- because transitions among states having different total tribution to broadening, and one need consider only an angular momenta (/) but the same K, or molecular quantum number, must be considered.

Gordy has recently reported microwave measurements on the HCN rotational spectrum (Rev. Mod. Phys. 20, 668 (1948)) and it is to be hoped that the observation of one or two of these lines will definitely settle the question. C. Foreign Gas Broadening: Van der Waals Interactions Broadening of microwave lines by pressures of foreign gases has been the subject of some experimental investigations. 20,24 The theoretical approach to the problem of foreign gas broadening has generally been that of computing the Van der Waals interactions between the molecules concerned and using these to obtain broadening cross sections.

Becker and S. H. Autler, Phys. Rev. 70, 300 (1946). PRESSURE BROADENING by 661 cross sections a calculated by means of the known Van der Waals forces come out usually to be considerably smaller than the kinetic theory cross sections comffdisp. = ( 3 a ' + a " + ( « " - « ' ) COS20), (19b) puted from viscosity, etc. This means that the forces which cause broadening must be the higher order and where a 2 is still the polarizability of the isotropic mole- exchange forces which come into prominence a t the cule, Ii and Iz are the fundamental frequencies from diameter corresponding to the kinetic theory crossone-term dispersion formulas, or the ionization poten- section.

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