CI-MBPT and Intensity-Based Lifetime Calculations for Th II
Lifetime calculations of Th II J = 1.5 and 2.5 odd states are performed with configuration–interaction many-body perturbation theory (CI-MBPT). For many J = 2.5 states, lifetimes are quite accurate, but two pairs of J = 2.5 odd states and many groups of J = 1.5 states are strongly mixed, making theo...
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Published in | Atoms Vol. 8; no. 4; p. 87 |
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Language | English |
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01.12.2020
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Abstract | Lifetime calculations of Th II J = 1.5 and 2.5 odd states are performed with configuration–interaction many-body perturbation theory (CI-MBPT). For many J = 2.5 states, lifetimes are quite accurate, but two pairs of J = 2.5 odd states and many groups of J = 1.5 states are strongly mixed, making theoretical predictions unreliable. To solve this problem, a method based on intensities is used. To relate experimental intensities to lifetimes, two parameters, one an overall coefficient of proportionality for transition rates and one temperature of the Boltzmann distribution of populations, are introduced and fitted to minimize the deviation between theoretical and intensity-derived lifetimes. For strongly mixed groups of states, the averaged lifetimes obtained from averaged transition rates were used instead of individual lifetimes in the fit. Close agreement is obtained. Then intensity branching ratios are used to extract individual lifetimes for the strongly mixed states. The resulting lifetimes are compared to available directly measured lifetimes and reasonable agreement is found, considering limited accuracy of intensity measurements. The method of intensity-based lifetime calculations with fit to theoretical lifetimes is quite general and can be applied to many complex atoms where strong mixing between multiple states exists. |
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AbstractList | Lifetime calculations of Th II J = 1.5 and 2.5 odd states are performed with configuration–interaction many-body perturbation theory (CI-MBPT). For many J = 2.5 states, lifetimes are quite accurate, but two pairs of J = 2.5 odd states and many groups of J = 1.5 states are strongly mixed, making theoretical predictions unreliable. To solve this problem, a method based on intensities is used. To relate experimental intensities to lifetimes, two parameters, one an overall coefficient of proportionality for transition rates and one temperature of the Boltzmann distribution of populations, are introduced and fitted to minimize the deviation between theoretical and intensity-derived lifetimes. For strongly mixed groups of states, the averaged lifetimes obtained from averaged transition rates were used instead of individual lifetimes in the fit. Close agreement is obtained. Then intensity branching ratios are used to extract individual lifetimes for the strongly mixed states. The resulting lifetimes are compared to available directly measured lifetimes and reasonable agreement is found, considering limited accuracy of intensity measurements. The method of intensity-based lifetime calculations with fit to theoretical lifetimes is quite general and can be applied to many complex atoms where strong mixing between multiple states exists. |
Author | Savukov, Igor M. |
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Cites_doi | 10.1103/PhysRevA.93.022511 10.1103/PhysRevA.90.032512 10.1103/PhysRevA.81.042516 10.1103/PhysRevA.99.032507 10.1103/PhysRevLett.104.213002 10.1051/0004-6361:20077249 10.1103/PhysRevA.71.062501 10.1088/1361-6455/aa8017 10.1093/mnras/staa1740 10.1038/35055507 10.1093/mnras/189.3.607 10.1088/0067-0049/211/1/4 10.1103/PhysRevA.92.052516 10.1051/0004-6361:20011597 10.1103/PhysRevA.54.3948 10.1088/0031-8949/38/3/006 10.1086/590111 10.6028/jres.078A.014 10.1088/1402-4896/abb421 10.1088/0022-3700/20/14/005 10.1016/0375-9601(89)90129-1 |
ContentType | Journal Article |
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CorporateAuthor | Los Alamos National Lab. (LANL), Los Alamos, NM (United States) |
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Snippet | Lifetime calculations of Th II J = 1.5 and 2.5 odd states are performed with configuration–interaction many-body perturbation theory (CI-MBPT). For many J =... |
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SubjectTerms | Accuracy actinides ATOMIC AND MOLECULAR PHYSICS Boltzmann distribution CI-MBPT Configuration management Energy Experiments Lifetime Mathematical analysis Optimization Perturbation theory radiative lifetimes Th II |
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Title | CI-MBPT and Intensity-Based Lifetime Calculations for Th II |
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