Kinetics of Ordering for Surface Phase Transitions
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Professor Unertl and Dr. Liang, Exxon Corp., will use grazing                   incidence x-ray scattering, low energy election diffraction and                 scanning tunneling microscopy to determine the kinetics of                      ordering for surface phase transitions.  The measurements will be               compared with recent theoretical predictions about pattern                      formation and universal scaling behavior including; a description               of domain growth, the existence of universality classes and the                 scaling properties of scattering functions, the description of                  effects of ground state degeneracy and symmetry, and the                        limitations imposed by surface imperfections.  If validated these               predictions will permit a wide range of nucleation and growth                   phenomena in diverse systems to be characterized simply.                        Technological processes including sintering in then films,                      solidification following laser melting, and the stability of                    rapidly quenched amorphous materials can be better understood.                  The model systems to be studied include Au(110), Pb/Cu(110),                    Pb/Cu(001), and Se/Ni(001).  Experiments will include the use of                the National Synchrotron Light Source at Brookhaven National                    Laboratory.
{'FirstName': 'William', 'LastName': 'Unertl', 'PI_MID_INIT': 'N', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'William N Unertl', 'EmailAddress': 'unertl@maine.edu', 'NSF_ID': '000336513', 'StartDate': '05/01/1988', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
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[{'Code': '1764', 'Text': 'LOW TEMPERATURE PHYSICS'}, {'Code': '1771', 'Text': 'METAL & METALLIC NANOSTRUCTURE'}]
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