Time-Domain Light Scattering Spectroscopy of Condensed      Matter
{'Code': '03070007', 'Directorate': {'Abbreviation': 'MPS', 'LongName': 'Direct For Mathematical & Physical Scien'}, 'Division': {'Abbreviation': 'DMR', 'LongName': 'Division Of Materials Research'}}
{'SignBlockName': 'David Nelson', 'PO_EMAI': None, 'PO_PHON': None}
A comprehensive experimental program for the study of several                   related problems in condensed-matter dynamics using novel time-                 resolved spectroscopy techniques is proposed.  "Impulsive"                      stimulated Raman, Brillouin, and Rayleigh-scattering                            techniques,  which taken together comprise an all-time-domain                   form of light-scattering spectroscopy, will be carried out on                   femtosecond through nanosecond time scales to examine the                       dynamics of crystals near structural phase transitions,                         incommensurate crystalline phases, and viscoelastic and                         "simple" fluids. Strongly coupled, highly dissipative modes                     important in these systems will be characterized through direct                 observation of their time-dependent motions.  In crystals near                  structural phase transitions, the (often overdamped) order                      parameter and acoustic  modes in incommensurate phases will be                  examined.  Dispersive acoustic behavior in viscoelastic fluids                  near the liquid-glass transition region will be characterized.                  Finally, the damped vibrational (i.e. inertial) nature of                       orientational motion in simple molecular liquids will be                        elucidated.  The time-domain approach used complements                          conventional frequency-domain light-scattering spectroscopy of                  these systems since it is well suited  for characterization of                  very low-frequency modes, heavily damped  (including                            overdamped) modes, dispersive modes, and strongly                               coupled modes of these types.  The similarities in behavior of                  the classes of matter to be studied will facilitate                             experimental  work and analysis as well as theoretical                          interpretation of results.
{'FirstName': 'Keith', 'LastName': 'Nelson', 'PI_MID_INIT': 'A', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Keith A Nelson', 'EmailAddress': 'kanelson@mit.edu', 'NSF_ID': '000421082', 'StartDate': '06/01/1987', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
{'Name': 'Massachusetts Institute of Technology', 'CityName': 'CAMBRIDGE', 'ZipCode': '021394301', 'PhoneNumber': '6172531000', 'StreetAddress': '77 MASSACHUSETTS AVE', 'StreetAddress2': None, 'CountryName': 'United States', 'StateName': 'Massachusetts', 'StateCode': 'MA', 'CONGRESSDISTRICT': '07', 'CONGRESS_DISTRICT_ORG': 'MA07', 'ORG_UEI_NUM': 'E2NYLCDML6V1', 'ORG_LGL_BUS_NAME': 'MASSACHUSETTS INSTITUTE OF TECHNOLOGY', 'ORG_PRNT_UEI_NUM': 'E2NYLCDML6V1'}
{'Name': None, 'CityName': None, 'StateCode': None, 'ZipCode': None, 'StreetAddress': None, 'CountryCode': None, 'CountryName': None, 'StateName': None, 'CountryFlag': None, 'CONGRESSDISTRICT': None, 'CONGRESS_DISTRICT_PERF': '""'}
{'Code': '1762', 'Text': 'SOLID STATE & MATERIALS CHEMIS'}
{'url': 'https://www.nsf.gov/awardsearch/download?DownloadFileName=1987&All=true', 'xml': '8704352.xml'}