Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Impulsive control of ground surface dynamics of I-3(-) in solution
Autore:
Gershgoren, E; Vala, J; Kosloff, R; Ruhman, S;
Indirizzi:
Hebrew Univ Jerusalem, Inst Chem, IL-91904 Jerusalem, Israel Hebrew Univ Jerusalem Jerusalem Israel IL-91904 -91904 Jerusalem, Israel
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY A
fascicolo: 21, volume: 105, anno: 2001,
pagine: 5081 - 5095
SICI:
1089-5639(20010531)105:21<5081:ICOGSD>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
PUMP-PROBE SPECTROSCOPY; COHERENT VIBRATIONAL MOTION; FEMTOSECOND-PHOTODISSOCIATION; FILTER-DIAGONALIZATION; GEMINATE RECOMBINATION; MULTIPHOTON IONIZATION; COMPUTER-SIMULATION; SYMMETRY-BREAKING; STATE DYNAMICS; LIGHT-PULSES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
85
Recensione:
Indirizzi per estratti:
Indirizzo: Ruhman, S Hebrew Univ Jerusalem, Inst Chem, IL-91904 Jerusalem, Israel Hebrew Univ Jerusalem Jerusalem Israel IL-91904 usalem, Israel
Citazione:
E. Gershgoren et al., "Impulsive control of ground surface dynamics of I-3(-) in solution", J PHYS CH A, 105(21), 2001, pp. 5081-5095

Abstract

Coherent control of I-3(-) ground state dynamics in ethanol and acetonitrile solutions is demonstrated. The method is based on impulsive excitation creating a dynamic hole employing sub 30 fsec tunable UV laser pulses. The target of control was to increase the ratio of second to first harmonic spectral modulations of the symmetric stretching vibrational coherences. Methods demonstrated to achieve this target include altering pulse intensity whenthe excitation pulses are tuned to the maximum of the absorption peak, double excitation pulses separated by half a vibrational cycle, and tuning thepumping or probing pulses to a wavelength simultaneously resonant with both absorption bands of ground state I-3(-) Chirping the probing pulses further allows full mapping of the ground state coherence in phase space, pinpointing the position of the dynamic holes not only in coordinate space but also in momentum. A theoretical model reconstructs the results nearly quantitatively and provides insight into the mechanisms active in achieving the control aims. It further demonstrates how the fundamental suppression serves to precisely characterize the relaxation dynamics of weak spectral featuressuch as higher harmonics of the symmetric stretching and the antisymmetricstretching Fundamental. In particular, the ratio of dephasing rates of thefirst two harmonics (similar to2.3) deviates considerably from the ratio of 4 predicted by Kubo line shape theory. Possible sources of this discrepancy based upon alternative dephasing models are discussed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 02:56:36