Physical ReviewAmerican Physical Society, 1920 In Feb. 1903, the separate publication of the Bulletin of the American Physical Society was discontinued and Its Proceedings published in the Physical review. |
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amplifier angle anode apparatus atoms axis bell calculated cathode cent charge circuit condenser constant corresponding crystal curve decrease detecting efficiency determined direct current discharge distance drop effect electric electrometer electrons emission end correction energy equation experimental experiments field filament frequency galvanometer gamma rays given gives glass grid heat impact increase insulation intensity iodine ionization ionization chamber ionization potential ions least common multiple length liquid magnetic maximum measured mercury metal method molecules negative nitrogen nutation observed obtained oscillations partial PHYS plate positive potential pressure produced R₁ radiation Radium radius ratio rays reflection refractive index resistance resonance rotation shown shows slit sodium nitrate sound spark spectrometer spectrum striking note sulphur surface Table temperature theory tion tube tungsten vacuum tube vapor velocity voltage volts wave wave-length wire X-rays zero ρω
Popular passages
Page 370 - In general, to stimulate research in the mathematical, physical and biological sciences, and in the application of these sciences to engineering, agriculture, medicine and other useful arts, with the object of increasing knowledge, of strengthening the national defense, and of contributing in other ways to the public welfare.
Page 523 - The experimental work was carried out in the Laboratory of the Indian Association for the Cultivation of Science and the writer desires to express his gratefulness to Prof.
Page 386 - It is clear that when the filament is heated by the passage of an electric current through it the potential of its two terminals is different.
Page 534 - K critical absorption frequency and one of the L critical absorption frequencies should not exactly equal the frequency of one of the Ka emission lines.
Page 438 - M appears is an equation which expresses the fact that the sum of the kinetic and potential energies of the gyro-molecule remains constant.
Page 462 - SYNOPSIS. Effect of Magnetization of Crystal on Intensity of X-ray Reflection; Theory. — The intensity of reflection of X-rays from a crystal depends upon the arrangement of the atoms within the crystal and upon the arrangement of the electrons within the atom. If the ultimate magnetic particle is a group of atoms, such as the chemical molecule, magnetization of the crystal will change the orientation of the group and hence change the positions of the individual atoms.
Page 462 - ... Reflection; Theory. — The intensity of reflection of X-rays from a crystal depends upon the arrangement of the atoms within the crystal and upon the arrangement of the electrons within the atom. If the ultimate magnetic particle is a group of atoms, such as the chemical molecule, magnetization of the crystal will change the orientation of the group and hence change the positions of the individual atoms. If the ultimate magnetic particle is the atom, magnetization will change the orientation...
Page 463 - ... the mid-planes of their atomic layers. If, however, the crystal is magnetically saturated perpendicular to the reflecting face of the crystal, the electronic orbits, being perpendicular to the magnetic axes of their atoms, will all lie parallel to the crystal face. The electrons will therefore now be in the midplanes of the layers of atoms which are effective in producing the reflected beam. It can be shown that such a shift of the electrons must produce a very considerable increase in the intensity...
Page 525 - ... unusually large. Our values of the wave-lengths are uniformly larger than those obtained by photographic methods. On the average these differences amount to between one and two per cent. The measurements by Siegbahn and Jonsson were made with an interesting spectrometer specially designed to eliminate errors due to the penetration of the X-rays into the reflecting crystal, etc. In an ordinary spectronometer, if the grazing angle...
Page 524 - ... the crystal and the effective reflecting plane, etc., the authors employed the third method mentioned in the article referred to, above. In this method two slits between the X-ray tube and the spectrometer define the width of the beam of X-rays that strikes the crystal, and the slit in front of the ionization chamber has sufficient breadth to allow the entire reflected beam to enter the chamber. With this arrangement of slits the angle through which the crystal turns (not the angle made by the...