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Laboratory Investigation of the Growth and Crystal Structure of Nitric Acid Hydrates by Transmission Electron Microscopy (TEM)A great deal of recent laboratory work has focussed on the characterization of the nitric acid hydrates, thought to be present in type I Polar Stratospheric Clouds (PSCs). Phase relationships and vapor pressure measurements (1-3) and infrared characterizations (4-5) have been made. However, the observed properties of crystalline solids (composition, melting point, vapor pressure, surface reactivity, thermodynamic stability, extent of solid solution with other components, etc.) are controlled by their crystal structure. The only means of unequivocal structural identification for crystalline solids is diffraction (using electrons, X-rays, neutrons, etc.). Other observed properties of crystalline solids, such as their infrared spectra, their vapor pressure as a function of temperature, etc. yield only indirect information about what phases are present, their relative proportions, or whether they are crystalline or amorphous.
Document ID
20010118510
Acquisition Source
Ames Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Blake, David F.
(NASA Ames Research Center Moffett Field, CA United States)
Chang, Sherwood
Date Acquired
August 20, 2013
Publication Date
January 1, 1994
Subject Category
Solid-State Physics
Meeting Information
Meeting: Atmospheric Effects of Aviation Project
Location: Virginia Beach, VA
Country: United States
Start Date: June 24, 1994
End Date: July 1, 1994
Funding Number(s)
PROJECT: RTOP 152-13-60
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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