Nonresonant photon dressing in spin one quadrupolar systems

Miscellaneous · Wed Jan 01 00:00:00 EST 1992

OSTI ID:7049814

Zhuang, Y L

This thesis mainly studied the effects of nonresonant photon dressing on spin 1 pure quadrupolar system with symmetric EFG. Energy levels of spin 1 nuclei dressed by linearly or circularly polarized photons were theoretically derived and numerically analyzed. The degeneracy of m[sub [Zeta]] equals [+-]1 states is not lifted, so only one line can be excited and it is shifted up in frequency. The energy levels are dependent on the angle [theta] between the principle EFG [zeta] axis and the dressing field. A general formula for powder patterns due to photon dressing was derived and numerical examples were plotted for linearly polarized photons, spin 1 and 3/2, and circularly polarized photons, spin 1. In all cases, NQR lines are broadened and have a peak located at [zeta] = 90[degrees]. Energy levels of photon dressed protons in zero static field are analyzed to discuss [sup 14]N spin-echo time. Protons reorient between [+-]1/2 states rapidly, so that their local field tends to average out. Powdered crystalline samples Trimethylamine (TMA), Triethylene-diamine (TED), and Hexanethylenetetramine (HMT) all with symmetric EFG were experimentally investigated by [sup 14]N NQR. For circularly polarized dressing of 25 G peak, no NQR frequency shift was observed; a monotonic line narrowing was observed in TMA and TED, but not HMT; fine structure details of TED and HMT were revealed as a result of the line narrowing, but the cause of the fine structure was not determined. A portion of this thesis studied the effects of annealing and hydrogenation on short-range order in amorphous III-V compounds through NMR linewidth. [alpha]-GaP, [alpha]-GaAs, and [alpha]-GaAs: H grown on single crystal alkali halide substrates by rf-sputtering were studied. The results were compared with previous measurements on [alpha]-GaP and [alpha]-GaAs grown on different substrates at different temperatures. The study showed sample microstructure is directly influenced by sample preparation conditions.

• Research Organization: City Univ. of New York, NY (United States)
• OSTI ID: 7049814
• Resource Relation: Other Information: Thesis (Ph.D.)
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
GALLIUM ARSENIDES
NUCLEAR MAGNETIC RESONANCE
GALLIUM PHOSPHIDES
POWDERS
LINE WIDTHS
PROTONS
ENERGY LEVELS
ANNEALING
FINE STRUCTURE
HYDROGENATION
LINE BROADENING
LINE NARROWING
METHYLAMINE
MICROSTRUCTURE
POLARIZATION
POLYCRYSTALS
QUADRUPOLES
SOLID STATE PHYSICS
SPIN ECHO
SPUTTERING
AMINES
ARSENIC COMPOUNDS
ARSENIDES
BARYONS
CHEMICAL REACTIONS
CRYSTALS
ELEMENTARY PARTICLES
FERMIONS
GALLIUM COMPOUNDS
HADRONS
HEAT TREATMENTS
MAGNETIC RESONANCE
MULTIPOLES
NUCLEONS
ORGANIC COMPOUNDS
PHOSPHIDES
PHOSPHORUS COMPOUNDS
PHYSICS
PNICTIDES
RESONANCE
664200* - Spectra of Atoms & Molecules & their Interactions with Photons- (1992-)