Application of Analytic Continuations to Avoided Crossings
作者:
Louis Yu,
Jeng Shiow‐Yau Chao,
期刊:
Journal of the Chinese Chemical Society
(WILEY Available online 1993)
卷期:
Volume 40,
issue 1
页码: 11-22
ISSN:0009-4536
年代: 1993
DOI:10.1002/jccs.199300003
出版商: WILEY‐VCH Verlag
关键词: Avoided crossing;Branch point;Analytic continuation method;Generalized Padé;approximation;Continued fraction approximation;Stabilization method
数据来源: WILEY
摘要:
AbstractThe two‐root (i,j,k) generalized Padé approximation (GPA) and three‐root (i,j,k,l) GPA as well as the two‐root continued fraction approximation (CFA) and the three‐root CFA are applied to the model of a three‐state avoided crossing. These two procedures for analytic continuation are compared. The results indicate that both methods provide good continuation into the complex plane and can be applied to locate the complex branch point. When the same input data are chosen, the GPA works slightly better than the CFA. According to our analysis, the two‐root procedure can be applied to locate the branch point around each region of avoided crossing in the problem of a multi‐state avoided crossing. The accuracy of the result is found to be associated the location of comple
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