Subject: Re: CCL:Fwd: phase/orbitals

From: "Zhenhua Li" <[email-masked]>
Date: Thu, 14 Jun 2001 13:56:25 +0800

Einstein once said that it is theory that determines what we can observe. So
although orbital or whatever is just a mathematical concept, maybe one day
we can really design some methods to observe them experimentally.
But what is physical, it is hard to say.

----- Original Message -----
From: <[email-masked]>
To: <[email-masked]>
Sent: Thursday, June 14, 2001 11:40 AM
Subject: CCL:Fwd: phase/orbitals

>
> >From: "N. Sukumar" <[email-masked]>
> >Date: Wed, 13 Jun 2001 21:26:05 -0400
> >To: [email-masked]
> >Subject: CCL:phase/orbitals
> >Sender: "Computational Chemistry List" <[email-masked]>
> >
> >The approximate nature of orbitals in many-electron systems is indeed a
very
> >different issue from the question of "observability" or "physical
reality".
> >
>
> Note that physical methods such as electron momentum spectroscopy
> (EMS) can probe the momentum distributions of orbitals (especially
> valence orbitals) and in that sense allows one to 'visualize' them.
> It is possible to get extremely nice agreement between the
> theoretical momentum distributions from DFT calculations, for
> example, and the experimentally observed MDs.
>
>
> --
> Cheers,
>
> Dave
>
> Dr. David A. Winkler                    Email:
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