Independent time approximation for dynamically interacting multi-electron systems

Autor:	J H McGuire, Alexander Godunov
Rok vydání:	2001
Předmět:	Causality (physics) Physics Electronic correlation Operator (physics) Quantum mechanics Limit (mathematics) Electron Statistical physics Condensed Matter Physics Atomic and Molecular Physics and Optics Order of magnitude Uncorrelated Time correlation
Zdroj:	Journal of Physics B: Atomic, Molecular and Optical Physics. 34:L223-L229
ISSN:	1361-6455 0953-4075
DOI:	10.1088/0953-4075/34/7/104
Popis:	We propose an independent time approximation (ITA), defined by simplifying the chronological operator, namely, TTunc, where Tunc is the uncorrelated limit of the chronological operator T. The concept of the time correlation is analogous to spatial electron correlation. In both cases `correlation' is the difference between an exact result and an uncorrelated limit. In the uncorrelated ITA the time correlation operator Tcor = T-Tunc is neglected and causality between electrons is lost. In second-order calculations of a two-electron transition the ITA reduces computer time by over two orders of magnitude. Greater savings are expected when higher orders or more electrons are included.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b451153ad65cb25d5ddcfc9dd8104484 https://doi.org/10.1088/0953-4075/34/7/104 Zobrazit plný text záznamu