INVESTIGATION OF COUPLED ELECTRON AND NUCLEAR SPIN SYSTEMS

Technical Report · Wed Mar 01 04:00:00 EST 1961

OSTI ID:4828150

Ganssen, A; Sloan, III, E L

A theory is presented which describes the time-dependent nuclear magnetization production obtained by means of the Overhauser effect in low- viscosity liquids containing unpaired electrons in free radicals or paramagnetic ions. An experimental technique is described which allows the simultaneous determination of the nuclear magnetization and of the nuclear spin lattice relaxation time T/sub 1/ on a flowing sample. The liquid flowing in a Teflon capillary within a homogeneous magnetic field of about 3300 gauss passes through a microwave cavity, where a partial saturation of the electron spin resonance is accomplished with a comparatively strong microwave field. The dynamic polarization resulting from the coupling with the electron spin system is detected by two nuclear magnetic resonance detection coils equipped with separate detection systems, arranged successively outside of the microwave cavity. The accuracy of the determinatton of the proton spin lattice relaxation time T/sub 1/ at with the liquid-flow technique is discussed under special consideration of the flow velocity distribution given by laminar and turbulent flow. (auth)

• Research Organization: National Co., Inc., Malden, Mass.
• NSA Number: NSA-16-021357
• OSTI ID: 4828150
• Report Number(s): RADC-TR-61-132; AD-266071
• Country of Publication: United States
• Language: English

Related Subjects

CAVITIES
COUPLING
ELECTRON SPIN RESONANCE
ELECTRONS
LIQUIDS
MAGNETIC FIELDS
METALS
MICROWAVES
NUCLEAR MAGNETIC RESONANCE
NUCLEI
OPENINGS
OVERHAUSER EFFECT
PHYSICS
POLARIZATION
TIME DEPENDENCE
VISCOSITY