Determination of absolute transition probabilities in neutral cerium from branching ratio and lifetime measurements

Autor:	John G. Conway, Brian J. Comaskey, John A. D. Stockdale, Earl F. Worden, Fred Nehring, Scott E. Bisson
Rok vydání:	1991
Předmět:	Materials science Spectrometer Branching fraction Ionization Statistical and Nonlinear Physics Photoionization Excitation temperature Emission spectrum Atomic physics Atomic and Molecular Physics and Optics Spectral line Cerium Isotopes
Zdroj:	Journal of the Optical Society of America B. 8:1545
ISSN:	1520-8540 0740-3224
DOI:	10.1364/josab.8.001545
Popis:	We have used the 1-m Fourier-transform spectrometer at the National Solar Observatory, Kitt Peak, Arizona, to record the emission spectrum of 140Ce from an electrodeless discharge lamp in the 4000–27 600-cm−1 range. Branching ratios are determined from the intensity data for transitions originating from common upper levels. These measurements are combined with lifetimes determined by a delayed photoionization technique to yield transition probabilities or gA values for 30 transitions. A plot of the logarithm of intensity divided by gA versus upper energy was constructed; the excitation temperature of the source was determined from this plot. Also from this plot, absolute gA values were derived for 228 of the most intense observed lines of Ce i between 10 706 and 22184 cm−1. To our knowledge, the gA values obtained here are the first reported for neutral cerium.
Databáze:	OpenAIRE
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