Nonperturbative theory and computation of the nonlinear response of He to dc and ac fields

Mercouris, T; Themelis, SI; Nicolaides, CA

dc.contributor.author	Mercouris, T	en
dc.contributor.author	Themelis, SI	en
dc.contributor.author	Nicolaides, CA	en
dc.date.accessioned	2014-03-01T01:50:06Z
dc.date.available	2014-03-01T01:50:06Z
dc.date.issued	2000	en
dc.identifier.issn	1050-2947	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/25992
dc.subject.classification	Optics	en
dc.subject.classification	Physics, Atomic, Molecular & Chemical	en
dc.subject.other	DOUBLY-EXCITED-STATES	en
dc.subject.other	ABOVE-THRESHOLD IONIZATION	en
dc.subject.other	MATRIX FLOQUET THEORY	en
dc.subject.other	MANY-PHOTON THEORY	en
dc.subject.other	MULTIPHOTON IONIZATION	en
dc.subject.other	NEGATIVE-IONS	en
dc.subject.other	POLYELECTRONIC ATOMS	en
dc.subject.other	DYNAMIC POLARIZABILITIES	en
dc.subject.other	PERTURBATION-THEORY	en
dc.subject.other	OPTICAL-PROPERTIES	en
dc.title	Nonperturbative theory and computation of the nonlinear response of He to dc and ac fields	en
heal.type	journalArticle	en
heal.identifier.secondary	013407	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	We have nonperturbatively computed de-field tunneling rates, linear and nonlinear dynamic polarizabilities, and two-, three-, four-, and five-photon ionization rates for He, for frequencies omega in the range (h) over bar omega=4.9-26.4 eV and for intensities; in the range 3.5 X 10(12)-1.715 X 10(14) W/cm(2). The calculations systematically incorporated electronic structure and electron correlation effects in the discrete and continuous spectra, while the two-electron state symmetries were S-1, P-1, D-1, F-1, (1)G, and H-1 of even and odd parities. The calculations were made by implementing a time-independent many-electron, many-photon theory which obtains cycle-averaged energy shifts Delta(omega,F) and energy widths Gamma(omega,F) nonperturbatively, where F is the field strength. These quantities are the real and imaginary parts of a complex eigenvalue z(0) (the result of the overall calculation), after the subtraction of the unperturbed real energy E-0.	en
heal.publisher	AMERICAN PHYSICAL SOC	en
heal.journalName	PHYSICAL REVIEW A	en
dc.identifier.isi	ISI:000085168800051	en
dc.identifier.volume	6001	en
dc.identifier.issue	1	en