Subject: Raith not working - beam blanking problem
From: Kenneth Brian Crozier <>
Date: Wed, 30 Jun 2004 15:29:16 -0700

Hi everyone,

James and I noticed that the specimen current was much higher than normal 
with the beam blanked by the Raith (1400 fA).  This could be the cause of 
the "splotch" problem reported earlier and detailed on the Raith swiki at:  Over a long exposure (e.g. the 
photonic crystal pattern shown takes about 90 min) this could lead to the 
large "splotch" being exposed when the beam is meant to be blanked.

It'd be great if anyone who has experienced similar problems could let both 
James and I know about it.

Ken Crozier, Ph.D.
room GL 51, Ginzton Laboratory,
Stanford University, Stanford, CA 94305, USA
tel : 650-723-1945  fax : 650-725-2533