Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Ab initio calculation of time-dependent control dynamics in polyelectronic systems involving bound and resonance states: Application to a quartet spectrum of He(-)
Δημιουργός/Συγγραφέας:	[EL] Κομνηνός, Γιάννης[EN] Komninos, Yannis [EL] Μερκούρης, Θεόδωρος Δ.[EN] Mercouris, Theodoros D. [EL] Νικολαΐδης, Κλεάνθης A.[EN] Nicolaides, Cleanthes A.
Εκδότης:	American Physical Society
Τόπος έκδοσης:	COLLEGE PK
Ημερομηνία:	2008-01
Γλώσσα:	Αγγλικά
ISSN:	1050-2947
DOI:	10.1103/PhysRevA.77.013412
Περίληψη:	Using a pump-probe scheme with controllable time-delay in the range of 0-73 fs, we have solved from first principles the time-dependent Schrodinger equation (TDSE) describing a hyper-fast excitation process that involves both the discrete and the continuous spectrum of the three-electron atomic negative ion, He(-). Two approaches were implemented, both using state-specific wave functions for two multiply excited discrete states (the initial state, He(-) 1s2s2p (4)P(o), and the final state, He(-) 2p(3) (4)S(o)), and one intermediate state which is a shape resonance (He(-) 1s2p(2) (4)P, including the underlying continuum of scattering states. The wavelengths of the two pulses connecting resonantly the states are in the infrared (10 080 angstrom) and in the soft x-ray region (323 angstrom). The first approach is analytic and solves the TDSE to first order in perturbation theory. This is acceptable for weak pulses whose duration is of the order of a few tens of femtoseconds. The second approach solves the TDSE nonperturbatively, via the state-specific expansion approach. A series of computations have produced time-dependent probabilities for preparing the triply excited bound state He(-)2p(3) (4)S(o) for various combinations of the duration of the two pulses. Apart from providing the first such quantitative data, the results suggest the appearance of effects of short-time nonexponential decay of resonances when it becomes possible to monitor excitation with time-delayed short pulses.
Τίτλος πηγής δημοσίευσης:	Physical Review A
Τόμος/Κεφάλαιο:	77
Τεύχος:	1
Σελίδες:	[10]
Θεματική Κατηγορία:	[EL] Οπτική. Φώς[EN] Optics. Light
Λέξεις-Κλειδιά:	Physics, Atomic, Molecular & Chemical
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Όροι και προϋποθέσεις δικαιωμάτων:	This article may be downloaded for personal use only. Any other use requires prior permission of the author and American Physical Society (APS). This article appears in "Physical Review A, vol. 77, no. 1, p. 10, Jan. 2008" and can be found at the following URL on the APS website: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.77.013412
Ηλεκτρονική διεύθυνση περιοδικού (link) :	http://pra.aps.org
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο