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On 27/09/2011 11:04 PM, Prema Awati wrote:
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<style type="text/css"><!--.MailHeader { font-family: "Arial"; font-size: 8pt; color: #000000; font-style: normal; font-weight: normal; text-decoration: none; }//--></style>Hi,<br>
Thanks for your suggestion; I am attaching the vac plot for
short time interval ; Please let me know whether its correct or
not.<br>
regards.<br>
<br>
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<br>
Atoms are colliding over a time scale not that much larger than the
integration time step (else you'd probably use a larger time step),
and the velocities change during collisions, so the characteristic
times of velocity autocorrelation are going to be not that much
larger than the integration time step. To measure how velocities
correlate with themselves, you need to make observations smaller
than that characteristic time. Your graph suggests you collected
data every 5ps (maybe every 2500 integration steps?), and shows that
there is little self-correlation at or beyond 5ps, which is what you
might have expected.<br>
<br>
Mark<br>
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