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New method for determining relative oscillator strengths of atoms through combined absorption and emission measurements: Application to titanium (TiI)

Cardon, Bartley L. and Smith, Peter L. and Whaling, Ward (1979) New method for determining relative oscillator strengths of atoms through combined absorption and emission measurements: Application to titanium (TiI). Physical Review A, 20 (6). pp. 2411-2419. ISSN 0556-2791. http://resolver.caltech.edu/CaltechAUTHORS:CARpra79

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Abstract

The authors introduce a procedure that combines measurements of absorption and emission by atoms to obtain relative oscillator strengths that are independent of temperature determination in the sources and of assumptions regarding local thermodynamic equilibrium. The experimental observations are formed into sets of transitions and required to satisfy defined ratios. The screened data are adjusted with a least-squares program to obtain optimized relative oscillator strengths and constants relating the observations to these values. With appropriate choices of input observations, the constants are proportional to upper-level lifetimes and lower-level populations. The procedure is illustrated by the published data of Whaling et al. and Smith and Kühne for 16 transitions in TiI. The relative oscillator strengths resulting from this procedure have calculated uncertainties between 5 and 17% (∼ 95% confidence level). Evidence is presented to suggest that these uncertainties have been overestimated. Calculated oscillator strengths are normalized to the atomic-beam absorption measurements of Bell et al. and to the experimental lifetimes of Roberts et al. and Whaling et al. The absolute oscillator strengths are determined with an uncertainty of 7-18%. The results indicate that the published lifetime for the level y 3D20 of TiI should be increased by 24%.


Item Type:Article
Additional Information:©1979 The American Physical Society. Received 8 June 1979. The authors wish to thank Jon Mathews and George Rybicki for providing insight into some of the mathematical details, W.H. Parkinson for his critical comments and interest, and James Esmond for helping with the data analysis. This work was supported in part by NASA under Grant No. NGL-22-007-006 to Harvar University and by NSF under Grant Nos. AST 76-81607 and PHY 76-83865 to the California Institute of Technology.
Record Number:CaltechAUTHORS:CARpra79
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:CARpra79
Alternative URL:http://dx.doi.org/10.1103/PhysRevA.20.2411
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9754
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:13 Mar 2008
Last Modified:26 Dec 2012 09:52

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