In rare-earth atomic metal clusters, such as Na and K, atoms are
spaced about 2.2 A apart. For comparison a C60 ball is about 7A in diameter.
Vadim
> -----Original Message-----
> From: Doug Brooks [SMTP:[email protected]]
> Sent: Thursday, February 18, 1999 9:34 AM
> To: [email protected]
> Subject: Re: [SI-LIST] : Atomic animation
>
> Thank you both Doug and Christian fo an interesting response. This may be
> getting deeper than I want to go or than is necessary to make my point!
> But
> now you bring up another question in my mind.......
>
> >
> >you were pretty close to a value I found in a text book. There
> >it says for the mean free path (in brackets: mean time between
> >collisions):
> >
> > Au: 410 Angstroms (tau = 2.9e-14 s)
> > Cu: 430 Angstroms (tau = 2.7e-14 s)
> > Ag: 560 Angstroms (tau = 4.1e-14 s)
> >
>
>
> If the 'mean free path' between collisions is approximately 400 angstroms
> (in copper) how far apart are the individual atoms in a copper lattice?
>
>
> As an aside, I had forgotten how much "empty space" there actually is in
> an
> atom until I recently read the following analogy (which may not be correct
> at all). The allegation was that if a typical atom (defined by the size of
> the electron rings) were the size of the earth, the nucleus would be the
> size of a football field! Is that even close to the truth?
>
> Thanks again for the thoughts.
>
> Doug
> .
> ****************************************************
> Doug Brooks, President [email protected]
> UltraCAD Design, Inc. http://www.ultracad.com
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