Scholarship 12/03513-6 - Femtossegundo, Espectroscopia resolvida no tempo - BV FAPESP
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Ultra-fast optical spectroscopy applied to photo-chemical reactions.

Grant number: 12/03513-6
Support Opportunities:Scholarships in Brazil - Post-Doctoral
Start date until: August 01, 2012
End date until: November 30, 2015
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal Investigator:Cleber Renato Mendonça
Grantee:Jonathas de Paula Siqueira
Host Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Associated research grant:11/12399-0 - Femtosecond pulses applied to nonlinear optics: spectroscopy, pulse shaping and microfabrication, AP.TEM
Associated scholarship(s):12/22102-7 - High order harmonic generation with high photon flux in the water window spectral region by the guided wave technique using a 2 µm OPCPA laser system, BE.EP.PD

Abstract

The main goal of the proposed work for the postdoctoral position consists on the implementation of optical spectroscopic techniques with ultrafast temporal resolution of the order of tens of femtoseconds, to investigate the dynamics of photophysical and photochemical processes. The main processes to be investigated consist of the photoisomerization reactions of azocompounds and intramolecular charge transfer in organic compounds, which are characterized by presenting electrons donors and electrons acceptors groups. Such processes have dynamics that evolve on ultra-fast time scales and are therefore inserted in a research field called femtochemistry. The investigation of ultrafast dynamics, such as those to be studied in this work, is of fundamental importance to elucidate the mechanisms involved in various chemical and biological processes. The time-resolved techniques of fluorescence and transient absorption, with expected temporal resolution of less than 50 fs, will be used in these studies. After implementation of such techniques, we intend to investigate the dynamics of ultrafast photoisomerization and charge transfer processes. The technique of frequency conversion in noble gas filled hollow fibers, recently implemented in the Photonics Group by the postdoctoral candidate, will allow the implementation of ultrafast spectroscopy techniques using as the excitation pulses in the deep ultraviolet (260 nm), with temporal duration less than 20 fs. These durations cannot be obtained by conventional direct conversion techniques using crystals, which will allow the study, with high temporal resolution, of the dynamics of reactions such as photodissociation and excited states deactivation of molecules that are extremely fast.

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
ALMEIDA, G. F. B.; MARTINS, R. J.; OTUKA, A. J. G.; SIQUEIRA, J. P.; MENDONCA, C. R.. Laser induced periodic surface structuring on Si by temporal shaped femtosecond pulses. Optics Express, v. 23, n. 21, p. 27597-27605, . (11/23587-1, 12/00702-2, 11/12399-0, 12/03513-6)
SIQUEIRA, J. P.; MENDONCA, C. R.; ZILIO, S. C.; MISOGUTI, L.. Spectral phase transfer from near IR to deep UV by broadband phase-matched four-wave mixing in an argon-filled hollow core waveguide. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, v. 49, n. 19, . (12/03513-6)

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