####################################################
# Aaron Gray <aarongr@gmail.com>
# requesting 6 days, at minimum=4 days
# beamline 33ID, Liquid Pb films on Si
# instrument 33ID-E surface
####################################################
# top:/home/www/beamtime-requests/req00823.txt
# UNICAT Member Beam Time Request  #823
# created Thu Aug 18 14:24:44 CDT 2005
####################################################

apsrun:
	2005-03

beamline:
	33ID

collaboration:
	Yes

collaborator_Hawoong:
	ON

contact:
	aarongr@gmail.com

days:
	6

description:
	Solid thin films have been studied widely and continue to be of interest, however their liquid counterparts have not received as much attention.  It has proven somewhat difficult to study Pb films grown on Si substrates near the melting transition, due to the fact that they dewett as the melting temperature is approached.  This dewetting behavior is dependent on the thickness of the film, and it is likely that the films will remain flat if they are sufficiently thick.  In this experiment Pb films, over 50 monolayers thick, will be grown on Si substrates.  These films will be heated above the Pb melting temperature, while the x-ray reflectivity and off specular truncation rods are being observed.  This will provide a better understanding of the thickness dependence of the dewetting behavior, in this system.   Furthermore the nature of the solid liquid transition can be determined, although in the bulk case the transition is first order it may be continuous for a film.  If the films remain flat above the melting temperature changes in layering, as well as in-plane ordering, and quantum size effects can be studied.

equipment_required:
	

experiment:
	Liquid Pb films on Si

foreign_nationals:
	

hazards:
	

instrument:
	33ID-E surface

instrument_other:
	

minimumdays:
	4

name:
	Aaron Gray

nonmembers:
	

submit:
	Submit

unacceptable_dates:
	I cannot be there Oct. 4 through Oct. 16.

z34ID_details:
	


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