New_Website/research.html

157 lines
5.8 KiB
HTML

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type"
content="text/html; charset=iso-8859-1">
<title>Theory of Cluster Dynamics</title>
<link href="style.css" rel="stylesheet" type="text/css">
</head>
<body>
<div id="container">
<div id="header">
<div id="menu">
<div id="navMenu">
<ul>
<li style="margin-top:1px;border-top:1px solid #B0C4DE; "><a href="index.html">Home</a></li>
<li><a href="intro.html">Introductory Overview</a></li>
<li><a href="research.html">Scientific Information</a></li>
<li><a href="staff.html">Staff</a></li>
<li><a href="publications.html">Publications/Talks</a></li>
<li><a href="contact.html">Contact</a></li>
</ul>
</div>
</div>
<div id="image">
<p><font color="white" size="6"><b>Theory of Cluster Dynamics</b></font><font size="5"><br>
</font><font size="6">
</font><font size="5">The Toulouse - Erlangen Collaboration</font></p>
</div>
</div>
<div id="content">
<div id="WideContent">
<div id="contentBoxWide">
<div id="contentBoxHeader">
<p>Our Research Activities</p>
</div>
<!-- <div id="contentBoxContent">
</div>
--> </div>
</div>
<div id="contentBoxWide"><!--
<div style="width:250px;float:left;">
<div id="cBoxEnv">
<div id="cBoxHeader">
A popular guide
</div>
<div id="cBoxContent">
<p>
For non-experts we provide some interesting basic and popular information on
our research activities: </p>
<ul>
<li>
<p><a href="intro.html">What are clusters?</a></p>
</li>
<li>
<p><a href="dynamics.html">Why studying cluster dynamics?</a></p>
</li>
<li>
<p><a href="ourdynamics/our_dynamics.html">How we deal with cluster dynamics</a></p>
</li>
</ul>
</div>
</div>
</div>
-->
<div style="width: 770px; float: left;">
<div id="cBoxEnv">
<div id="cBoxHeader"> A scientific guide </div>
<div id="cBoxContent">
<div style="text-align: justify;"> </div>
<p style="text-align: justify;">The core of our activities concerns the
dynamics of clusters. One can sort the various explored paths along
three major directions of research. In the first place, we focus on
intrinsic dynamical properties of clusters as revealed by moderate
external excitations. The second research axis deals with the response
of clusters when subjected to a possibly intense external field which, to a
large extent, shapes the response of the system. The third
aspect covers the numerous theoretical developments motivated by the
description of cluster dynamics in the various situations and domains
of excitations explored in the two previous items.
</p>
<p>
<b><a href="analysis/detail1.html">Time and energy resolved analysis
(intrinsic cluster dynamics)</a></b>
</p>
<p style="text-align: justify;">At moderate perturbations, the cluster
response dominantly reflects its own (structure and dynamical)
properties. This first item covers such situations (which for the
simplest ones can also be addressed in purely static pictures). The
optical response in metal clusters provides a typical example. </!--of such
situations--> But we also pursue detailed investigations of photoelectron
spectroscopy (energy and/or angle resolved) and of pump and probe
scenarios at moderate excitations.
</p>
<p>
<b><a href="analysis/detail2.html">
Free clusters in external fields</a></b></p>
<p style="text-align: justify;">
This general title covers several aspects of our activities sharing the
common denominator that the observed dynamics is a result of the
cluster in interaction with an external (static or time dependent)
field and not only of the cluster itself. The related phenomena lie in
the adiabatic regime (plasmon, harmonic generation) as well as
strongly non adiabatic situations. Extensive studies have thus been led
on the various scenarios encountered by clusters irradiated by intense
laser beams or hit by energetic highly charged projectiles.<br>
</p>
<p><b><a href="tddft-md/detailQMMM.html">Molecules and clusters in
contact with a polarizable environment</a></b>
</p>
<p style="text-align: justify;">Clusters can be more
easily handled experimentally when they are produced in contact with an environment
(deposited on a surface or embedded in a matrix). This concerns various experiments and a large
amount of experimental data. We have thus developed a generalized
Quantum Mechanics / Molecular Mechanics (QM/MM) method in the sense
that electronic degrees of freedom of the environment can be
explicitely treated dynamically. This hierarchical approach allows us
to explore various dynamical scenarios, as optical response of
deposited clusters, deposition processes, irradiation of embedded
clusters by an intense laser field, etc.<br>
</p>
<p><b><a href="tddft-md/formal.html">Theoretical developments</a> </b></p>
<p style="text-align: justify;">Understanding of cluster dynamics
represents a complex task which requires elaborate theoretical tools.
Density Functional Theory (DFT) represents here a robust starting point
which allows to address various situations. We use DFT at various
levels of sophistications (Local Density Approximation, <a
href="tddft-md/detailTDSIC.html">Self Interaction Correction</a>) in
our time dependent approach. The basic tool is <a
href="tddft-md/formal.html">
Time Dependent LDA</a> in the quantal Kohn Sham picture, but we have
also developed semi-classical schemes, in terms of the Vlasov-LDA approximation, possibly
complemented by dynamical correlations. Exploratory investigations are
also led to account for fluctuations by means of stochastic extensions
of time dependent mean field theories. </p>
</div>
</div>
</div>
</div>
<div id="footer">
<p></p>
</div>
</div>
</div>
</div>
</body>
</html>