#
# top.uni.aps.anl.gov:/home/www/beamtime-requests/req00222.txt
# UNICAT Member Beam Time Request  #222

# created Sun Dec 02 17:04:39 CST 2001
#
beamline:
	33ID

collaboration:
	Yes

collaborator+Hawoong:
	on

contact:
	czoschke@uiuc.edu

days:
	4

description:
	Low temperature growth of thin Ag films on clean Si(111) creates 
	self-organized 2 dimensional Ag islands whose physical properties could be 
	strongly influenced by quantum size effects (QSE).  If this is the case, it 
	would result in both a non-uniform distribution of island 
	height ('preferred' or 'magical' island heights), and an oscillatory 
	relaxation of layer thicknesses -- that is, regular deviations of island 
	height from the ideal height depending on thickness.
	  To examine this effect, we propose a low temperature deposition using the 
	surface x-ray diffraction chamber in 33-IDE.  By collecting the 
	reflectivity and other crystal truncation rods of the Ag/Si(111) system 
	over a wide range in reciprocal space, we can extract the nanoscale 
	properties by fitting with a simple model that predicts both population and 
	relaxation of island heights on the surface.

equipment+required:
	

experiment:
	Preferred island height and layer relaxation of Ag/Si(111)(7x7)

foreign+nationals:
	Z. Q. Ma

hazards:
	Liquid N2 will be needed.

minimumdays:
	3

name:
	Peter Czoschke

new+request:
	on

nonmembers:
	

unacceptable+dates:
	Jan 27-29
	March 16-25


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