http://fiscomp.if.ufrgs.br/index.php?action=history&feed=atom&title=Coolaboration_with_Claudio 2026-05-07T23:03:11Z Histórico de revisões para esta página neste wiki MediaWiki 1.43.0 http://fiscomp.if.ufrgs.br/index.php?title=Coolaboration_with_Claudio&diff=68&oldid=prev 2011-09-19T18:07:11Z

<p>Criou página com &#039;=== Role of anharmonicity and asimmetry of dimer potential === 1) Study anharmonic asimmetric potential: V(x)=0.5*k*x**2-beta*x**3/3 -Understand why anharmonicity destroys hyst...&#039;</p> <p><b>Página nova</b></p><div>=== Role of anharmonicity and asimmetry of dimer potential ===<br /> <br /> 1) Study anharmonic asimmetric potential: V(x)=0.5*k*x**2-beta*x**3/3<br /> <br /> -Understand why anharmonicity destroys hysteresis.<br /> -Is there a resonance? <br /> -Negative differential mobility near resonance?<br /> <br /> Find parameters for Lennard-Jones interaction that mimicks the anharmonic <br /> asimmetric potential<br /> <br /> 2) Study anharmonic simmetric potential<br /> V(x)=0.5*k*x2+beta*|x3|/3<br /> <br /> 3) Double well potential<br /> V(x)=alpha*x4-beta*x2<br /> <br /> Transition between different states due to resonance<br /> <br /> <br /> <br /> === Excitation of internal vibrations (up to dissociation) by moving the substrate ===<br /> <br /> <br /> 1) 1D dimer<br /> <br /> Consider &quot;oscillating&quot; substrate potential of the form <br /> V_sub(x,w)=U*cos(2pi/a*(x+x0*sin(wt)))<br /> <br /> Is there a resonance frequency w for which dimer internal motion is excited? <br /> <br /> <br /> 2) 2D cluster of nanoparticles on a substrate (connection with experiment of<br /> Spasova: Co nanoparticles on metal substrate)<br /> <br /> Idea: experimentally the nanoparticles form a triangular arrangement on the <br /> substrate, but it is desirable to have a uniform coverage. <br /> We could probably show that, by exciting a resonance in the cluster, the <br /> nanoparticles could dissociate and be pushed away from each other, thus <br /> balancing their tendency to clusterization.<br /> <br /> At first we can study a model system of LJ particles and see what the <br /> equilibrium configuration is and what happens if we move the substrate.</div>

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