#################################################### # Aaron Gray # requesting 6 days, at minimum=4 days # beamline 33ID, Liquid Pb films on Si # instrument 33ID-E surface #################################################### # top:/home/www/beamtime-requests/req00883.txt # UNICAT Member Beam Time Request #883 # created Mon Dec 05 14:25:40 CST 2005 #################################################### apsrun: 2006-01 beamline: 33ID collaboration: No collaborator_Hawoong: ON contact: ajgray@uiuc.edu 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, at temperatures around -135 degrees Celsius. These films will be heated above the Pb melting temperature, while the x-ray reflectivity, off specular truncation rods and rocking curves at small angles 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. Changes in layering, as well as in-plane ordering, and quantum size effects can also 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: z34ID_details: #REMOTE_HOST: chiangpc2.mrl.uiuc.edu #REMOTE_ADDR: 130.126.102.86 #CONTENT_LENGTH: 1505 #HTTP_REFERER: http://www.uni.aps.anl.gov/admin/unireq.html #HTTP_USER_AGENT: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.7) Gecko/20050414 Firefox/1.0.3