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Author Dinesen, T. R. ♦ Sanctuary, B. C. ♦ Meyer, H.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ DEUTERIUM ♦ NUCLEAR MAGNETIC RESONANCE ♦ MOLECULAR CRYSTALS ♦ SPIN ECHO ♦ SPIN ORIENTATION ♦ INTERMOLECULAR FORCES ♦ TEMPERATURE DEPENDENCE ♦ TEMPERATURE RANGE 0000-0013 K ♦ DIPOLE INTERACTIONS
Abstract Density matrix theory is used to calculate the response signal of both {ital o}-D{sub 2} (with rotational angular momentum {ital J}=0 and nuclear spin {ital I}=2) and {ital p}-D{sub 2} (with {ital J}={ital I} and {ital I}=1) in NMR experiments consisting of two-pulse sequences. The closed form method previously applied to the NMR {open_quote}{open_quote}solid echo{close_quote}{close_quote} of {ital o}-H{sub 2} (with {ital J}={ital I} and {ital I}=1) has been extended to the deuterium system arriving at a detailed account of the dipolar interactions between like and unlike spins in a hcp lattice of concentration {ital X}({ital J}=1). The predicted solid echo amplitude for both the {ital I}=1 and {ital I}=2 contributions is expressed as a function of the mole fraction {ital X}, the pulse parameters (the angle {beta} and relative phase {var_phi}), the time {tau} between the two pulses, the average spin-pair dipolar field {bar {delta}}{sub {ital jk}} and the average inhomogeneous field {bar {alpha}}{sub {ital j}}. Agreement is good between the theoretical predictions and the experiments in which the solid echo amplitude is recorded as a function of the experimentally controllable parameters {beta}, {var_phi}, and {tau}. For the {ital I}=2 fraction, the positions of the expected satellite echoes are determined, while failure to observe them in solid D{sub 2} is discussed in terms of the relative magnitudes of the intramolecular coupling terms and {bar {alpha}}{sub {ital j}}. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-09-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 54
Issue Number 9


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