On 9/8/2011 5:55 PM, David AuBuchon wrote:
Okay, I think I see...it's not a function of diameter but rather size
and configuration of atoms.
It is a function of size, which of course the diameter is as well. The
larger the particle, the longer the wavelength light it absorbs. Now if
you have a spherical particle, or one as close to spherical as possible
with the number of atoms in it, it will have a sharp absorption band,
since the resonance will be the same across any of its diameters. But
if you have one which is longer then it is wide, or irregularly shaped,
then the resonance across the minimum "diameter" will be a shorter
wavelength than across its maximum "diameter" and everything in between
between those two wavelengths. Thus a particle that is not completely
symmetrical will not have a sharp absorption resonance, which is why
after 4 atoms, it all smears out into a broad curve.
Marshall
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