Stationarity coefficients and short-time deviations from exponential decay in atomic resonance states

Mercouris, T; Nicolaides, CA

dc.contributor.author	Mercouris, T	en
dc.contributor.author	Nicolaides, CA	en
dc.date.accessioned	2014-03-01T01:52:11Z
dc.date.available	2014-03-01T01:52:11Z
dc.date.issued	2002	en
dc.identifier.issn	1050-2947	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/26592
dc.subject.classification	Optics	en
dc.subject.classification	Physics, Atomic, Molecular & Chemical	en
dc.subject.other	AUTOIONIZING STATES	en
dc.subject.other	DEPENDENCE	en
dc.subject.other	ENERGIES	en
dc.subject.other	LAW	en
dc.subject.other	BEHAVIOR	en
dc.subject.other	SYSTEMS	en
dc.subject.other	WIDTHS	en
dc.title	Stationarity coefficients and short-time deviations from exponential decay in atomic resonance states	en
heal.type	journalArticle	en
heal.identifier.secondary	012112	en
heal.language	English	en
heal.publicationDate	2002	en
heal.abstract	By solving rigorously and accurately the time-dependent Schrodinger equation, we have obtained numerical results for the decay probability, P(t), of real, multiparticle systems, in the time domain of tapproximate to0. Three different types of atomic nonstationary states were examined, the He- 1s2p(2) P-4, the Ca KLM 3d5p F-3(0), and the He- 1s2s2p P-4(5/2), the last one being metastable and decaying via spin-spin interactions. The main results are that there is a t dependence of P(tapproximate to0) and that a time-dependent short-time decay rate can be calculated. The computed coefficients of the t(2) term reflect the degree of stability of the state, (i.e., the degree of proximity to the notion of the standard stationary state of quantum mechanics), and are named the stationarity coefficients. These, together with the conventional quantity of the lifetime, corresponding to the exponential decay regime, constitute intrinsic properties of each real unstable state. For the herein studied metastable state the onset of exponential decay occurs after about 5 x 10(-14) s, i.e., after a duration which is achievable experimentally with laser pulses.	en
heal.publisher	AMERICAN PHYSICAL SOC	en
heal.journalName	PHYSICAL REVIEW A	en
dc.identifier.isi	ISI:000173273800026	en
dc.identifier.volume	65	en
dc.identifier.issue	1	en