Regular and chaotic multiphoton dissociation

Constantoudis, V; Nicolaides, CA

dc.contributor.author	Constantoudis, V	en
dc.contributor.author	Nicolaides, CA	en
dc.date.accessioned	2014-03-01T01:13:18Z
dc.date.available	2014-03-01T01:13:18Z
dc.date.issued	1997	en
dc.identifier.issn	1050-2947	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12418
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-16944367090&partnerID=40&md5=cf0c30726318c9c4917e8d7cd5b49227	en
dc.subject.classification	Optics	en
dc.subject.classification	Physics, Atomic, Molecular & Chemical	en
dc.subject.other	DRIVEN MORSE OSCILLATOR	en
dc.subject.other	LASER-INDUCED DISSOCIATION	en
dc.subject.other	CLASSICAL DYNAMICS	en
dc.subject.other	QUANTUM-THEORY	en
dc.subject.other	SCATTERING	en
dc.subject.other	EXCITATION	en
dc.subject.other	SINGULARITIES	en
dc.subject.other	FIELD	en
dc.subject.other	ATOMS	en
dc.title	Regular and chaotic multiphoton dissociation	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1997	en
heal.abstract	The rate of multiphoton dissociation of the BeH2+ molecule in its ground and first two excited vibrational levels has been computed via classical mechanics as a function of laser frequency. There is agreement with earlier quantum-mechanical results as regards the existence and magnitude of an optimal frequency, omega, for which the dissociation rate is maximized. This fact has been analyzed and understood via the application of the theory of chaotic scattering. Indeed, we find fractal singularities in the function T-d(x) Of the duration of photodissociation, and we compute their dimension to be equal to 1, in agreement with the conjecture of Lan, Finn, and Ott [Phys. Rev. Lett. 66, 978 (1991)] that this must be a characteristic of systems exhibiting nonhyberbolic scattering. Turning to the problem of interpreting the appearance of an optimal omega, we propose the following two mechanisms for the reduction of the multiphoton dissociation rate. First is the increase of fractal singularities when the frequency omega attains values larger than omega. Second is the gradually increasing overlap of the classical initial state with the region of Kolmogorov-Arnold-Moser tori when omega<omega. Finally, as the intensity is increased there is a transition from chaotic to regular photodissociation, where the singularities in T-d(x) are finite. It is conjectured that this reflects the emergence of the quantum-mechanical phenomenon of above-threshold dissociation.	en
heal.publisher	AMERICAN PHYSICAL SOC	en
heal.journalName	Physical Review A - Atomic, Molecular, and Optical Physics	en
dc.identifier.isi	ISI:A1997WH91900059	en
dc.identifier.volume	55	en
dc.identifier.issue	2	en
dc.identifier.spage	1325	en
dc.identifier.epage	1330	en