2016-06-14 16:35:36 +02:00
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2016-06-14 16:35:36 +02:00
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2018-03-20 14:44:50 +01:00
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<p><font size="6" color="white"><b>Theory of Cluster Dynamics</b></font><font
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size="5"><br />
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</font><font size="6"> </font><font size="5">The Toulouse -
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Erlangen Collaboration</font></p>
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name="oben">
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</a><a href="../tddft-md/formal.html">1. Theoretical developments </a> </div>
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<a href="detail1.html"> 2. Analysis of cluster
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dynamics </a> </div>
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<a href="detail2.html"> 3. Clusters in strong external
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fields </a> </div>
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<a href="../tddft-md/detailQMMM.html"> 4. Embedded clusters </a> </div>
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<p> Clusters in strong external perturbations</p>
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<!-- START CONTENT HERE --> <br />
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<p> Clusters in the strong fields of extremely intense lasers
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show a much different dynamics. Core electrons can be released
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and contribute strongly to the process. The detailed
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description at the fully quantum mechanical level of TDLDA
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becomes untractable. However, the excitations involved
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validate classical approaches. <br />
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<br />
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<img src="figs/MD_fig5.gif" width="300" align="right" /> The
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figure to the right shows the result of a molecular dynamics
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simulation of electronic and ionic dynamics of Na<sub>41</sub><sup>+</sup>
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under the influence of strong laser fields [<a href="../literatur.html#own1308">332</a>].
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Ionization
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is drawn as function of laser intensity. One sees a sharp kink
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at a critical intensity of I = 10<sup>16</sup> W/cm<sup>2</sup>.
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This threshold value is explained by the fact that the Coulomb
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force from the laser field at the threshold just
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equals the binding forces of the core electrons.
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The increase is due to the core electrons which now start to
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participate in the dynamics. This view is illustrated by
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separating the contributions from valence (green line) and
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core electrons (red line). There is indeed zero emission from
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core electrons up to I = 10<sup>16</sup> W/cm<sup>2</sup> and
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the strong increase above that critical intensity is
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exclusively due to the contribution from core electrons. <br />
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<br />
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2016-06-14 16:35:36 +02:00
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