NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Electron Spin Resonance (ESR) Studies of Returned Comet Nucleus SamplesElectron Spin Resonance (ESR) studies have been carried out on organic and inorganic free radicals generated by gamma-ray and/or UV-irradiation and trapped in ice matrices. It is suggested that the concentration of these free radicals together with their thermal stability can be used as an accurate built-in geothermometer and radiation probe for returned comet nucleus sample studies. ESR studies have also been carried out on paramagnetic (Mn(2+), Ti(3+), and Fe(3+)) and ferromagnetic (ferric oxide and metallic iron) centers known to be present in terrestrial and extraterrestrial samples. The presence or absence of these magnetic centers coupled with their characteristic ESR lineshape can be used to investigate the shock effects, quenching/cooling rate and oxidation-reduction conditions in the formation and subsequent evolution of returned comet nucleus samples.
Document ID
19980218996
Acquisition Source
Headquarters
Document Type
Conference Paper
Authors
Tsay, Fun-Dow
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA United States)
Kim, Soon Sam
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA United States)
Liang, Ranty H.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA United States)
Date Acquired
August 18, 2013
Publication Date
December 1, 1997
Publication Information
Publication: Analysis of Returned Comet Nucleus Samples
Subject Category
Lunar And Planetary Exploration
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Document Inquiry

Available Downloads

There are no available downloads for this record.
No Preview Available