Engineering topics

Notesco, G.

Publications and source records attributed to Notesco, G..

2 records

NASA NTRS1999

An experimental study of the isotopic enrichment in Ar, Kr, and Xe when trapped in water ice

The isotopic enrichment of argon, krypton, and xenon, when trapped in water ice, was studied experimentally. The isotopes were found to be enriched according to their (m1/m2)1/2 ratio. These enrichment factors could be useful for comparison among the uncertain cosmic or solar isotopic ratios, the hopeful in situ cometary ratio, and those in Earth's atmosphere, in the context of cometary delivery of volatiles to Earth.

NASA Discipline Exobiology↗

NASA NTRS1991

Gas release from comets

The quantities of such volatiles as CO, CO2, and CH4 trapped in cometary water ice are of great importance in the determination of solar nebula temperature and composition in the regions of their formation. Experiments with water ice are presently noted to retain trapped gases beyond the temperature of amorphous ice's transformation to cubic ice; the retention of gases which emerge during the transformation of the cubic form to hexagonal (as well as during evaporation) occurs to a degree that is linearly dependent on the thickness of the ice layer.

Notesco, G.↗