Subject: RE: Dosing PMMA on a Cr layer
From: "David Goldhaber-Gordon" <>
Date: Thu, 17 Feb 2005 15:33:49 -0800

Hi Morgan,

I don't have experience on PMMA on Cr, but it is not strictly correct
that what's below doesn't matter. Electrons can certainly make it
through a thin metal film, and then the lengthscale for backscattering
will depend on the substrate. I just don't have off the top of my head
the scattering lengths for 10 kV electrons in Cr, and I don't know what
your substrate is (or, really, what energy you're using).



David Goldhaber-Gordon 
Assistant Professor of Physics 
Stanford University (permanent forwarding) 
(650) 725-2047 (lab) (650) 724-3709 (office) 

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-----Original Message-----
From: Morgan Douglas Mager [] 
Sent: Thursday, February 17, 2005 11:06 AM
Subject: Dosing PMMA on a Cr layer

Does anyone have experience writing with 2% PMMA over Cr? If so, what
kind of exposure/development did you use? I would think that since it is
a metallic layer, it doesn't matter what is below the Cr (Si/SiO2/etc).
Does anyone know for sure if that is correct? Any information on spin
speeds/thickness would be useful as well. Thanks.