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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Vabim vas na 16. predavanje iz sklopa "Kolokviji na IJS" v
letu 2008/09, ki bo <strong><b><font color=red face="Times New Roman"><span
style='color:red'>v sredo, 13. maja 2009, ob 13:00 uri </span></font></b></strong><font
color=red><span style='color:red'>v Veliki predavalnici Instituta »Jožef
Stefan«</span></font> na Jamovi cesti 39 v Ljubljani. Napovednik predavanja
najdete tudi na naslovu <a href="http://www.ijs.si/ijsw/Koledar_prireditev">http://www.ijs.si/ijsw/Koledar_prireditev</a>,
posnetke preteklih predavanj<font color=blue><span style='color:blue'> </span></font>pa
na <a href="http://videolectures.net/kolokviji_ijs">http://videolectures.net/kolokviji_ijs</a>.
<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<o:p></o:p></span></font></p>
<p class=MsoNormal><b><font size=3 face="Times New Roman"><span
style='font-size:12.0pt;font-weight:bold'>Prof. dr. Giulio Cerullo<o:p></o:p></span></font></b></p>
<p class=MsoNormal><i><font size=3 face="Times New Roman"><span
style='font-size:12.0pt;font-style:italic'>Politehnična Univerza v Milanu,
Italija<o:p></o:p></span></font></i></p>
<p class=MsoNormal><b><font size=4 face="Times New Roman"><span
style='font-size:14.0pt;font-weight:bold'><o:p> </o:p></span></font></b></p>
<p class=MsoNormal><b><font size=4 face="Times New Roman"><span
style='font-size:14.0pt;font-weight:bold'>Opazovanje fotoinduciranih procesov v
biomolekulah<o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=4 face="Times New Roman"><span
style='font-size:14.0pt;font-weight:bold'><o:p> </o:p></span></font></b></p>
<p class=MsoNormal style='text-align:justify;text-justify:inter-ideograph'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>V organskih
molekulah se mnogo s svetlobo induciranih procesov, kot so: energijska
relaksacija, prenos energije/naboja in sprememba konformacije, se zgodi na
ultrahitrih časovnih skalah v območju od 10-14 do 10-12 s. Hitrost teh osnovnih
procesov je neposredno povezana z njihovo učinkovitostjo, zato je ultrahitra
optična spektroskopija neprecenljivo orodje za njihove raziskave.
Spektroskopija “pump-probe” zahteva tako kratke sunke za opazovanje hitre
dinamike, kot širok frekvenčni razpon za vzbuditev sistema v resonanci in
detektiranje sprememb v optičnih prehodih pri različnih frekvencah. Optični
parametrični ojačevalniki so idealno orodje pri takšnih eksperimentih, saj
omogočajo nastavljivo frekvenco s širokim ojačevalnim profilom. V predavanju
bom predstavil tehnološko vrhunski sistem, ki temelji na dveh
sinhroniziranih optičnih parametričnih ojačevalnikih in omogoča časovne
ločljivosti pod 20 fs v širokem spektralnem območju od 400 nm do 1.5 μm. Po
pregledu tehnik generacije sunkov in učinkovitosti sistema bom predstavil
izbrane primere aplikacij kot so: prenos energije v fotosinteznih organskih
kompleksih, elektronska in vibracijska dinamika v ogljikovih nanocevkah in
izomerizacija rodopsina.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;
text-align:justify;text-justify:inter-ideograph'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Predavanje bo v
angleščini.<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><strong><b><font
size=3 color=red face=Calibri><span style='font-size:12.0pt;font-family:Calibri;
color:red'>Lepo vabljeni!</span></font></b></strong><strong><b><font
face="Times New Roman"><span style='font-weight:normal'><o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal align=center style='text-align:center'><b><font size=6
face="Times New Roman"><span style='font-size:24.0pt;font-weight:bold'>***<o:p></o:p></span></font></b></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<font size=3 face="Times New Roman"><span style='font-size:12.0pt;font-family:
"Times New Roman"'><br clear=all style='page-break-before:always'>
</span></font>
<p class=MsoNormal style='text-align:justify;text-justify:inter-ideograph'><font
size=3 face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>We
would like to invite you to 16<sup>th</sup> lecture of the "Kolokvij na
IJS" in the school year 2008/09. The lecture will be held <b><span
style='font-weight:bold'>on Wednesday, May 13, 2009, at 1 pm</span></b> at <b><span
style='font-weight:bold'>JSI main lecture hall</span></b>, Jamova 39, <st1:place
w:st="on"><st1:City w:st="on">Ljubljana</st1:City></st1:place>. The abstract of
the lecture can be found on website: </span></font><font size=2><span
lang=EN-US style='font-size:10.0pt'><a
href="http://www.ijs.si/ijsw/Koledar_prireditev"><font size=3><span
style='font-size:12.0pt'>http://www.ijs.si/ijsw/Koledar_prireditev</span></font></a></span></font><span
lang=EN-US>, the previous recorded lectures can be found on website: </span><font
size=2><span lang=EN-US style='font-size:10.0pt'><a
href="http://videolectures.net/kolokviji_ijs"><font size=3><span
style='font-size:12.0pt'>http://videolectures.net/kolokviji_ijs</span></font></a></span></font><span
lang=EN-US>.</span><font size=2><span lang=EN-US style='font-size:10.0pt'> </span></font><span
lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>********************************************<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-align:justify;text-justify:inter-ideograph'><font
size=3 face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><b><font size=3 face="Times New Roman"><span
style='font-size:12.0pt;font-weight:bold'>Prof. dr. Giulio Cerullo<o:p></o:p></span></font></b></p>
<p class=MsoNormal><i><font size=3 face="Times New Roman"><span
style='font-size:12.0pt;font-style:italic'>Polytechnic University of Milan,
Italy<o:p></o:p></span></font></i></p>
<p class=MsoNormal><i><font size=3 face="Times New Roman"><span
style='font-size:12.0pt;font-style:italic'><o:p> </o:p></span></font></i></p>
<p class=MsoNormal><b><font size=5 face="Times New Roman"><span lang=EN-US
style='font-size:16.0pt;font-weight:bold'>Tracking primary photoinduced events
in biomolecules with few-optical-cycle light pulses<o:p></o:p></span></font></b></p>
<p class=MsoNormal align=center style='text-align:center'><b><font size=2
face=Arial><span lang=EN-US style='font-size:10.0pt;font-family:Arial;
font-weight:bold'><o:p> </o:p></span></font></b></p>
<p class=MsoNormal style='text-align:justify;text-justify:inter-ideograph'><font
size=3 face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>Many light-induced
processes in organic molecules, such as energy relaxation, energy/charge
transfer and conformational changes, occur on ultrafast timescales, ranging
from 10-14 to 10-12 s. The speed of such elementary processes is intimately
linked to their efficiency, making ultrafast optical spectroscopy an invaluable
tool for their investigation. Pump-probe spectroscopy requires both short
pulses, in order to observe fast dynamics, and broad frequency tunability, to
excite a system on resonance and probe optical transitions occurring at
different frequencies. Optical parametric amplifiers (OPAs) are ideal tools for
such experiments, because they provide frequency tunability and support broad
gain bandwidths, enabling the generation of very short pulses. In this talk I
will describe a state of the art system, based on two synchronized OPAs,
providing sub-20-fs temporal resolution over a very broad spectral range, from
400 nm to 1.5 </span></font><font face=Symbol><span lang=EN-US
style='font-family:Symbol'>m</span></font><span lang=EN-US>m. After reviewing
the pulse generation techniques and the system performance, I will present
selected examples of applications, such as: energy transfer in photosynthetic
light harvesting complexes, electronic and vibrational dynamics in carbon
nanotubes, isomerization of rhodopsin.<o:p></o:p></span></p>
<p class=MsoNormal style='text-align:justify;text-justify:inter-ideograph'><font
size=3 face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-align:justify;text-justify:inter-ideograph'><font
size=3 face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><b><font size=4 face="Times New Roman"><span lang=EN-US
style='font-size:14.0pt;font-weight:bold'>We look forward to meeting you at the
“Kolokvij na IJS”!<o:p></o:p></span></font></b></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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