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- W2288897651 abstract "Typescript.%%%%Bibliography: leaves [127]-130.%%%%viii, 130 l illus., tables%%%%The development 9f gas lasers has provided experimental atomic physicist with a new tool for selective probing of atomic energy levels. This dissertation describes development of a gas laser system for measurement of atomic parameters. The system has been applied to measurement of transition probabilities and collision excitation cross sections in neon. The experimental technique utilizes a helium-neon laser oscillating at 3.39 microns – 3s2- 3p4 (Paschen notation) – to perturb population density of 3s2 level in a neon discharge. This perturbation is coupled to 3s3 neon level through non-radiative collision induced transitions. The perturbations of excited state population densities are followed by observing intensity changes in spontaneous emission from 3s2 and 3s3 levels. By analyzing intensity changes from these two levels as a function of pressure, we have been able to determine product of lifetime of 3s3 level and cross section for collision induced transitions between 3s2 and 3s3 levels. This product is τ3q23 = (9.93 ± .80) x 10^-23 sec-cm^2 . The same measurements yield ratio of transition probability for 3s2-2p4 and 3s3-2p5 transitions. The measured ratio is 7.10 ± .57. In order to be able to vary pressure, the atoms to be investigated are contained within a gas discharge cell placed within laser cavity. A phase sensitive detection system is employed. Relative transition probabilities for ten other visible lines originating on 3s2 and 3s3 levels have also been determined. These relative transition probabilities are placed on an absolute scale using a recently measured value for 3s2-2p4 transition. The experimental values are compared to theoretically calculated transition probabilities for which a j-l coupling model was used. This comparison points out rather large departure of these levels from j-l coupling. Suggestions are made concerning improvement of system and its application to other problems." @default.
- W2288897651 created "2016-06-24" @default.
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- W2288897651 date "1968-01-01" @default.
- W2288897651 modified "2023-09-23" @default.
- W2288897651 title "The development of a gas laser system for the measurement of atomic parameters and its application to some energy levels in neon" @default.
- W2288897651 hasPublicationYear "1968" @default.
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