THE PHYSICAL CHEMISTRY OF ISOTOPIC SUBSTANCES. THE EFFECT OF PHYSICAL CHANGES ON ISOTOPE FRACTIONATION. THE CARBON ISOTOPE EFFECT IN THE SYNTHESIS OF DIAMOND. THE ISOTOPE EFFECT IN THE LOW-TEMPERATURE ADSORPTION OF GASES

Journal Article · Mon Dec 11 04:00:00 EST 1961 · Carnegie Inst. Wash., Papers Geophys. Lab.

OSTI ID:4753898

Hoering, T C; Bufalini, M

Measurements were made on the isotope effect in the solution of CO/sub 2/ in water, the effect of varying the activity coefficients of H/sub 2/O/sup 18/ and H/sub 2/O/sup 16/, the effect of pressure on isotopc fractionation, and the temperature coefficient of an isotope effect. The results indicated that pressure is not an important variable in determining the isotopic composition of substances. In the investigation of the carbon isotope effect in the synthesis of diamond at a temperature higher than 1700 deg C, fractionation between the graphite and diamond phases measured only 0.3% mil difference in the C/sup 13//C/ sup 12/ ratio. Therefore, it appears that there is little, if any, effect of pressure at such a high temperature. The isotope fractionation factor for several gases adsorbed on different adsorbents at low temperatures was also measured. For systems studied at two different temperatures there was very little, if any, temperature effect between 74 and 193 deg K. A lack of temperature and pressure effects was found for the adsorption of nitrogen on charcoal. (P.C.H.)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-17-004511
• OSTI ID: 4753898
• Journal Information: Carnegie Inst. Wash., Papers Geophys. Lab., Journal Name: Carnegie Inst. Wash., Papers Geophys. Lab. Vol. Vol: No. 1363
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ACTIVATED CARBON
CARBON 12
CARBON 13
CARBON DIOXIDE
CHEMISTRY
DIAMONDS
GASES
GRAPHITE
HIGH TEMPERATURE
ISOTOPE EFFECTS
LOW TEMPERATURE
MEASURED VALUES
NITROGEN
OXYGEN 16
OXYGEN 18
PREPARATION
PRESSURE
WATER