Index of content:
Volume 15, Issue 6, June 1944
15(1944); http://dx.doi.org/10.1063/1.1770254View Description Hide Description
A cross‐prism method is described whereby a single photograph of a fluorescencespectrum gives directly both intensity and spectral distribution of light brought about by light of all wave‐lengths used as exciting light. A vertical scanning of such a photograph gives the variation of light intensity of a given wave‐length as a function of the exciting wave‐length. A horizontal scanning gives the spectral energy distribution as a function of wave‐length for a given frequency of exciting light. Using a continuous source of ultravioletradiation, a single exposure thus gives all information necessary to determine the best frequencies of exciting light to produce a maximum fluorescent light of a given color or energy distribution.
15(1944); http://dx.doi.org/10.1063/1.1770255View Description Hide Description
With some proportional coincidence amplifiers having a short time constant input to the mixer stage it was found that the fraction of the true coincidences measured was a function of both the counter voltages and the absorber between the counters. This effect could be traced to the amplifier characteristics in conjunction with the short time constant before the mixer stage. The paper describes the counters and amplifiers, discusses the cause of the effect, and suggests possible uses.
- LABORATORY AND SHOP NOTE
15(1944); http://dx.doi.org/10.1063/1.1770256View Description Hide Description