Re: Just how much can we magnigy?

From: Xin Zhang (zhangx_at_umd.edu)
Date: 02/15/05 

Date: Tue, 15 Feb 2005 13:18:14 -0500

http://jeol.com/tem/temprods/jem3000f.html

Could be an example of electron illumination source.

The wavelength of "light" is one important thing, however our ability to
control the "light" is also important. The wavelength of electron used
in this TEM is about 0.002nm, but we can only see 0.1nm repeating
pattern, because it is very hard to bend high energy electrons, also we
need high vacuum and very thin sample because of low penetration ability
of electron.

So some one came to an fantastic idea, X-ray.

http://www.esrf.fr/exp_facilities/ID21/xrmlinks.html

This link may serve as a hub if you have interests about more about
X-ray microscope.

X-ray microscope is wonderful, people even looked into live bugs and
study their respiration system, P558, Science 299, 24 Jan 2003.

But X-ray is extreme hard to bend, so the resolution is not close to TEM
even in the future I can see. I was told the resolution could get close
to 20nm two years ago at a facility of Argonne National Lab of US, maybe
they can reach 10nm now. The link is http://www.aps.anl.gov/

And if you want to look at nuclei of atoms, you need neutron. But into
the future I can imagine, neutron microscopy is not way too hard.

Xin

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