[Pw_forum] about neb
baroni at sissa.it
Wed Jun 9 12:01:14 CEST 2004
In this way you will not obtain the normal modes of the physical system
you are interested in, but those of a fictitious system with different
masses. frequencies will be different, displacement patterns will be
The fact that you cannot disentangle exactly the modes in which the
adsorbed molecule vibrates from those in which the substrate atoms
vibrate is not an artifact of the calculation, but a fact of nature you
have to leave with (at least if you are interested in the way Nature
behaves rather than just in the output of a computer simulation).
On Jun 9, 2004, at 11:27 AM, Wu Rongqin wrote:
> Dear Dr. Baroni,
> I have thought of another way to calculate the norm mode of small
> molecular absorbed on a surface.
> The idea is quite simple. Since the frequency is related closely to
> the mass, then in the input file, I can set the mass of atoms in the
> slab to a very large value so that the correspondent frequencies are
> greatly lowered so the norm mode of small molecular absorbed can be
> figured out.
> Just give me some comments on this and how to give a zero point energy
Stefano Baroni --- SISSA & DEMOCRITOS National Simulation Center
via Beirut 2-4 34014 Trieste Grignano /
[+39] 040 3787 406 (tel) -528
Please, if possible, don't send me MS Word or PowerPoint attachments
Why? See: http://www.gnu.org/philosophy/no-word-attachments.html
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Size: 2528 bytes
Desc: not available
More information about the users