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Hi! My name is Freddy
Fernandes
Guimarães. I was born in
Belo Horizonte, MG, Brazil, in February 3rd of 1975. I am married and I
have two children. My wife's name is Andrezza Saldanha de
Oliveira Guimarães, the names of our daughter and son are Laira
and
Arthur. The football team that I support in Brazil
is Clube Atletico Mineiro (nickname: GALO), which was the first
Brazilian champion in
1971.
I am a chemist. I graduated in chemistry at the University Federal of Minas Gerais (UFMG) in the year of 2000. My under-graduate final work was in molecular and atomic scattering studies. In the year of 2002, also in the UFMG, I got a Master degree in Physical-Chemistry, studying the conformation of molecular and metallic atomic clusters. This studies were based in the genetic algorithms evolutionary approach, that is an Artificial Intelligence technique, which is applied in the search of the Global Minimum in the potential energy surface. Nowadays, I am a PhD student at the Theoretical Chemistry, KTH and at the Department of Chemistry at the UFMG. I am studying the two color pump-probe spectroscopy. Basically, my studies are related with the transition of a virtual vibrational state to a core exited or ionized electronic state. The virtual vibrational state is prepared with a Infrared laser in the electronic ground state. And, it is probed afterwords with x-ray pulse given the absorption probability transition (Fig. 1). More details in Projects. |
![]() MOV.
1: Wave Packet
propagation in the groud electronic state. The WP is a coherent
superpossition of the vibrational states, which is generate by the pump
field.
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![]() FIG. 1: Qualitative
illustration of pump-probe
spectroscopy. The pump infrared laser prepare a virtual vibrational
state which is probe by a x-ray field. The spectral shape can be
modified for short pulses of the probe signal, which selects the wave
packet in a certain region of the PES. The spectra
b and c represent the absorption
probability probed by short x-ray pulse (time and phase dependent
spectra). And, d refers to a spectrum probed by a long x-ray pulse
(time and phase independent spectrum).
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![]() FIG.
3: The structures of the lowest-energy composomers found for 11<x+y<30.
The Cu atoms are represented by red and Au atoms
by yellow.
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![]() FIG. 2: The Global
Minimum of (H_2O)_6 clusters computed for different empirical
potentials. TIP3P a three site potential, TIP4P and ST2 four site
potentials, and TIP5P a five site potential.
![]() FIG. 4: All composomers found for a fixed nuclearity N = 19. The Cu atoms are represented by red and Au atoms by yellow. |
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