An electrical discharge suitable for the excitation of high stages of ionization in gases has been developed. This discharge has been used to excite neon gas and the resulting emission has been recorded with a 3-meter grazing incidence vacuum spectrograph. One hundred and seventeen lines have been identified in the spectrum of Ne IV; fifty-six lines in Ne V, and twenty-five in Ne VI. It has been possible to make fairly accurate calculations of the ionization potentials of Ne IV and Ne V as 96.43 volts and 125.8 volts, respectively. The ionization potential of Ne VI is estimated to be 157 volts.
A modified King electric furnace, charged with, rare earth salts, has been used to observe the absorption spectra of cerium, neodymium and samarium in the region 12,000A to 2500A with a 21-ft. concave grating giving dispersion of 2.5A/mm in the first order. The observations include 600 lines in cerium, 450 in neodymium, and 1500 in samarium. In general the absorption data confirm the line types as given by King's temperature classification in that, of those lines which are absorbed, the class I lines are more strongly absorbed than class II lines, which are in turn stronger than class III lines, and provide additional data in that only those lines of each class which involve the lowest levels appear in absorption.
1067long and short range alpha-particles is thus a reasonable one. The fact that the gamma-ray yields are larger, and, near the 330-kev resonance, much larger than the yield of long range alpha-particles, makes it necessary to assume that, at least for this 7-ray resonance, the long range alphaemission is either forbidden or reduced.If then the excited state is even, we should expect the resonance yield of long range alpha-particles to be comparable with, and probably considerably greater than the yield of pairs. If this is not so, the pair emission itself would seem to provide strong evidence for a nonelectromagnetic coupling between electrons and heavy particles.
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