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An absolute calibration of a set of counters has been obtained by determining their efficiencies and effective volumes. From observations recorded with this calibrated set, the number of ionizing cosmic rays is 0.80±0.028 per cm 2 per minute from unit solid angle at the vertical at sea level....
A new band-system has been found when ultraviolet light is absorbed by arsenic vapor, heated to 1100°C. Some eighty band-heads have been detected between the wave-lengths of 2200 and 2750A. An analysis of the vibrational levels has been made, which shows that the spectrum can be ascribed to the...
The recombination of free electrons and free positrons and its connection with the Compton effect have been treated by Dirac before the experimental discovery of the positron. In the present note are given analogous calculations for the production of positron electron pairs as a result of the...
The hypothesis, proposed by Druyvesteyn and others, that the K α -satellites arise from transitions of a 2 p ( L I I , I I I ) electron into the 1 s ( K ) shell in the presence of one or two further vacancies in the L shell is tested (1) by comparing in the case of sodium the separations from...
The existence of a magnetostrictive effect (Joule effect) in nonferromagnetic substances, first demonstrated by Kapitza for large transient fields, is here shown for steady fields of moderate (20 to 25 kg) values. Pure (99.97 percent) Bi single crystals and crystals with dissolved foreign atoms...
The theory of the extraction of intense beams of positive ions from the low voltage arc is discussed, and the develops ment of a requisite apparatus described, with which beamof several milliamperes of ions from H 2 , He, N 2 and C O 2 have been produced. The influence of the gas pressure and...
Sparking potentials were observed between outgassed nickel electrodes in air at low pressures. The spark length d was varied from 2-10 mm and the pressure p reduced from 1 mm of mercury to 0.06 mm. Sparking potentials as high as 80,000 volts were observed, and agreed approximately with Paschen's...
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