AUGMENTATION OF THE NUCLEAR POLARIZATION IN LIQUIDS AND GASES ADSORBED ON CARBON. EXTENSION TO SOLIDS CONTAINING PARAMAGNETIC IMPURITIES

Journal Article · Sat Nov 01 04:00:00 EST 1958 · Journal de Physique et le Radium (France) Changed to J. Phys. (Orsay, Fr.)

OSTI ID:4291632

Uebersfeld, J; Motchane, J L; Erb, E

A new effect (different from the Overhauser effect) for enhancement of nuclear polarization by double resonance is described. A liquld or gas is adsorbed on carbon. Carbon contains paramagnetic centers on its aurface that can interaot with the nuclesr spins of adsorbed liquid or gas. The proton signal is observed in the liquid (benzene or toluene) or the gas (ammoriac or hydrogen sulfide) in a magnetic field H/sub o/ = 3,000 gauss. The nuclear resonance signal is increased without population inversion (absorption increases) when the micrcwave frequency v/sub e/ --v/sub N/ is applied, where v/sub e/ and v/sub N/ are the electronic and the nuclear resonance frequencies. The nuclear resonance signal is increased with population inversion (stimulated emission) if the applied frequency is nu /sub e/ + nu /sub n/. The same effect exists with solids since it is also obtained when the adsorbed benzene is frozen, or with solids that have been irradiated to produce paramagnetic centers. The enhancements obtained so far are of the order of 20 (with a microwave field of a fraction of a gauss) for a theoretical factor of 660 for protons, the maximum polarization attainable corresponding to the electron gyromagnectic factor. (auth)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-13-005843
• OSTI ID: 4291632
• Journal Information: Journal de Physique et le Radium (France) Changed to J. Phys. (Orsay, Fr.), Journal Name: Journal de Physique et le Radium (France) Changed to J. Phys. (Orsay, Fr.) Vol. Vol: 19; ISSN JPAAA
• Country of Publication: Country unknown/Code not available
• Language: French

Related Subjects

ABSORPTION
ADSORPTION
AMMONIA
BENZENE
CARBON
DIFFUSION
ELECTRONS
EMISSION
EXTRAPOLATION LENGTH
FREQUENCY
GASES
IMPURITIES
INTERACTIONS
LIQUIDS
MAGNETIC FIELDS
MEASURED VALUES
MICROWAVES
MINERAL ACIDS
NEUTRONS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
PHYSICS AND MATHEMATICS
POLARIZATION
POPULATIONS
PROTONS
SIGNALS
SOLIDS
SPIN
SULFUROUS ACID
TOLUENE