Sound Velocities at High Pressure:  An Application of Laser Induced Phonon Spectroscopy
{'Code': '06030204', 'Directorate': {'Abbreviation': 'GEO', 'LongName': 'Directorate For Geosciences'}, 'Division': {'Abbreviation': 'EAR', 'LongName': 'Division Of Earth Sciences'}}
{'SignBlockName': 'Robin Reichlin', 'PO_EMAI': None, 'PO_PHON': None}
The PI will assemble a laboratory at the University of                     Washington for the purpose of measuring sound velocities of                     candidate mantle minerals at high pressure and temperature.  On                 the basis of successful preliminary experiments, he has                         demonstrated that it is feasible to make such measurements on                   small (100  um) samples in a diamond anvil high pressure cell.                  Impulsive stimulated scattering (ISS) in the form of laser                      induced phonon spectroscopy provides a robust technique to                      investigate the elastic properties of crystals at high pressure.                Coherent phonons, generated by a pair of overlapping laser                      pulses, temporally and spatially modulate the index of refraction               of sample.  A probe laser pulse can be strongly diffracted by the               resultant time-dependent grating.  Signals are orders of                        magnitude greater than with any other technique.  This technique                also side-steps the uncertain index-of-refraction problem often                 associated with Brillouin scattering experiments.  The                          determination, under mantle conditions, of pressure and                         temperature derivatives of elastic constants for candidate mantle               constituents is one of the important current problems in mineral                physics.
[{'FirstName': 'J', 'LastName': 'Brown', 'PI_MID_INIT': 'M', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'J M Brown', 'EmailAddress': 'brown@ess.washington.edu', 'NSF_ID': '000433206', 'StartDate': '01/15/1989', 'EndDate': None, 'RoleCode': 'Principal Investigator'}, {'FirstName': 'Leon', 'LastName': 'Slutsky', 'PI_MID_INIT': 'J', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Leon J Slutsky', 'EmailAddress': 'slutsky@gibbs.washington.edu', 'NSF_ID': '000174669', 'StartDate': '01/15/1989', 'EndDate': None, 'RoleCode': 'Co-Principal Investigator'}]
{'Name': 'University of Washington', 'CityName': 'SEATTLE', 'ZipCode': '981951016', 'PhoneNumber': '2065434043', 'StreetAddress': '4333 BROOKLYN AVE NE', 'StreetAddress2': None, 'CountryName': 'United States', 'StateName': 'Washington', 'StateCode': 'WA', 'CONGRESSDISTRICT': '07', 'CONGRESS_DISTRICT_ORG': 'WA07', 'ORG_UEI_NUM': 'HD1WMN6945W6', 'ORG_LGL_BUS_NAME': 'UNIVERSITY OF WASHINGTON', 'ORG_PRNT_UEI_NUM': None}
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[{'Code': '1574', 'Text': 'Geophysics'}, {'Code': '1580', 'Text': 'Instrumentation & Facilities'}]
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