摘要:

In order to explain the nitrogen afterglow, Cario and Kaplan have assumed the presence of metastable2D and2P atoms in active nitrogen. The nitrogen emission lines at 1492 Å and 1742 Å have these metastable states as lower states, and should therefore be absorbed by active nitrogen. However, no absorption has been found by the writers. This leads to 1/6000% as an upper limit for the stationary concentration of metastable atoms in active nitrogen, which is compatible with the experiments. In order to account for the observed intensity of the afterglow, on the basis of Cario-Kaplan's theory, a lifetime of the metastable2P atomshas to be assumed and a concentration of metastable molecules greater than 1/330%.

ISSN:1923-4287    

DOI:10.1139/cjr37a-004

出版商:NRC Research Press    

年代:1937

数据来源: NRC

摘要:

β-rays were bent in a uniform magnetic field, after which they entered, as approximately homogeneous rays, an ionization chamber connected to a linear amplifier. Absorption curves in aluminium were determined for various values ofHρ. The active materials were radiumEand uraniumX.

ISSN:1923-4287    

DOI:10.1139/cjr37a-005

出版商:NRC Research Press    

年代:1937

数据来源: NRC

摘要:

The end points of the β-ray spectra of radiumEand uraniumX2have been measured, using semi-circular magnetic focusing and an ionization chamber connected to a linear amplifier. Experimental results give end points ofHρ = 5250 gauss-cm. for radiumEandHρ = 9300 gauss-cm. for uraniumX2.

ISSN:1923-4287    

DOI:10.1139/cjr37a-006

出版商:NRC Research Press    

年代:1937

数据来源: NRC

摘要:

The scattering of X-rays at small angles (minutes of arc) in commercial samples of charcoal and powdered graphite and in anthracene precipitate was investigated. In addition, the effect of pressure on the scattering in Shawinigan charcoal was determined. An absorption method, which is described, was used and the results are shown graphically in the accompanying figure.

ISSN:1923-4287    

DOI:10.1139/cjr37a-007

出版商:NRC Research Press    

年代:1937

数据来源: NRC