/sup 12/C//sup 13/C and H/D vapor pressure isotope effects of fluoroform: intermolecular interactions in liquid fluoroform

Technical Report · Mon Jun 01 04:00:00 EDT 1981

DOI:https://doi.org/10.2172/6333566· OSTI ID:6333566

Popowicz, A M

A precision cryostat of the Bigeleisen-Brooks-Ribnikar-Ishida (BBIR) type with associated vacuum systems has been constructed and the appropriate temperature/pressure measurement and control systems designed and implemented. Various improvements in the cryostat design were incorporated in order to facilitate the assembly and repair processes. A major design change involved the incorporation of a digital stand alone computer to control cryostat operations. This apparatus was used to measure the /sup 12/C//sup 13/C and H/D Vapor Pressure Isotope Effects of Fluoroform. Analysis of the measured VPIE results, in light of existing experimental data and theories, has demonstrated the need of a temperature dependent liquid force field, specifically a temperature-dependent interaction force constant between the C-H stretching motion and translational motion in the direction of the figure axis of CHF/sub 3/. This result is consistent with the observed spectroscopic data and vibrational and configurational models of fluoroform dimers. The intermolecular interaction is believed to be a weak hydrogen-bond in nature.

• Research Organization: State Univ. of New York, Stony Brook (USA)
• DOE Contract Number: AC02-80ER10612
• OSTI ID: 6333566
• Report Number(s): DOE/ER/10612-3; ON: DE81024422
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400202 -- Isotope Effects
Isotope Exchange
& Isotope Separation
640305* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Theory-- (-1987)
74 ATOMIC AND MOLECULAR PHYSICS
CARBON 12
CARBON 13
CARBON ISOTOPES
CHEMICAL BONDS
DATA
DEUTERIUM
ELEMENTS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FLUIDS
FLUORINATED ALIPHATIC HYDROCARBONS
FLUOROFORM
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROGEN
HYDROGEN ISOTOPES
INFORMATION
INTERATOMIC FORCES
ISOTOPE EFFECTS
ISOTOPES
LIGHT NUCLEI
LIQUIDS
MEASURING METHODS
NONMETALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHYSICAL PROPERTIES
STABLE ISOTOPES
TEMPERATURE EFFECTS
THERMODYNAMIC PROPERTIES
VAPOR PRESSURE