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Phan Thị Cẩm Nhung, Nguyễn Ngọc Ty, Lê VănHoàngBy using the strong field approximation via Lewensteinmodel we calculate high-order harmonic generation(HHG) spectra induced while ultra-short pulses ofintense lasers interacting with the basic bases of DNAsuch as Adenine (C5H5N5), Guanine (C5H5N5O),Cytosine (C4H5N3O), Uracil (C4H4N2O2), Thymine(C5H6N2O2). Analyzing the calculated data we candistinguish the bases from each other by the alignmentdependence of HHG. Further more, we apply theiterative method, suggested in our previous work, forretrieving some structural information of the Cytosinebase from the ‘simulated experimental’ HHG data.Người trình bày: Phan Thị Cẩm Nhung99. Genetic Algorithm and Retrieval of InteratomicSeparations of the Complex Molecules byUltrashort Laser PulsesNguyễn Ngọc Ty, Lê Văn HoàngWe show that the iterative method suggested in ourprevious work is applicable for complex molecules (O3,OSC, and BrCN) in order to retrieve interatomicseparations from high-order harmonic generation(HHG) spectra emitted by the molecules interactingwith the ultrashort intense laser pulses. For retrieval ofstructure information, two parameters of interatomicseparations in these cases, we need HHG spectra at leastfor two different alignments. For fitting procedure, thegenetic algorithm can be applied that reduces timeconsumingin compare with the direct scanning method.This is very important for further application ofmolecules having a large number of structuralparameters.Người trình bày: Nguyễn Ngọc Ty100. Tracking Acetylene/Vinylidene IsomerizationProcess by Ultrashort Laser Pulses using HighHarmonic GenerationNguyễn Ngọc Ty, Tăng Thị Bích Vân, Lê VănHoàngWe simulate the Acetylene/Vinylidene isomerization bythe Born-Oppenheimer molecular dynamics methodimplemented in the GAUSSIAN 3.0 package.Furthermore, by using the Lewenstein model we thencalculate the high-order harmonic generation (HHG)spectra emitted by C2H2 molecule during the chemicalreaction path of isomerization due to interacting withthe 10 fs pulse of the 800nm intense laser. We identifythe intensity peaks of HHG spectra nearby the stable,meta-stable and transition states of the C2H2 moleculethat can be useful for tracking the Acetylene/Vinylideneisomerization process.Người trình bày: Nguyễn Ngọc TyThành phố Đồng Hới (03- 06/8/2009) Trang 85/ 102Thành phố Đồng Hới (03- 06/8/2009) Trang 86/ 102