assuming that the sample begins at equilibrium. I and S are Over the past few years, we and others have shown that, the two different kinds of spins ( 1 H and 13 C in our experiin a wide variety of two-dimensional solution NMR experiments, respectively), and the indices i and j run up to the ments,
Quantum Treatment of Intermolecular Multiple-Quantum Coherences with IntramolecularJCoupling in Solution NMR
β Scribed by Sangdoo Ahn; Warren S. Warren; Sanghyuk Lee
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 340 KB
- Volume
- 128
- Category
- Article
- ISSN
- 1090-7807
No coin nor oath required. For personal study only.
β¦ Synopsis
A recently introduced density matrix picture for dipolar effects
Alternatively, it is possible to write a density matrix treatin solution NMR (1996, J. Chem. Phys. 105, 874) gave complete ment which explicitly shows the origin of the cross peaks solutions for intermolecular multiple-quantum coherences for sinin intermolecular multiple-quantum coherences (iMQCs). gle-component samples without scalar couplings. This paper, for This ''quantum picture' ' (3, 11) discards two main assumpthe first time, shows that this quantum picture can lead to explicit tions of NMR theory-the high-temperature approximation signal expressions for multicomponent samples of molecules with and the neglect of intermolecular dipole-dipole interactions.
π SIMILAR VOLUMES
The behavior of intermolecular multiple-quantum coherences in a variety of simple liquids with different chemical and magnetic properties is investigated experimentally and modeled by numerical simulations based on modified Bloch equations. The effects of spin concentration, temperature, intramolecu
Intermolecular zero-quantum coherences (iZQC) induced by the dipolar demagnetizing field can give both P-and N-type cross peaks. This paper shows that the relative intensities of the two types of iZQC peaks follow a simple relation, tan 2 (/2), from both the quantum (spin density matrix) and classic
Novel 2D and 3D pulse sequences producing images through the phase encoding of intermolecular multiple quantum coherences (i-MQCs) are presented. The signal acquired with these sequences is free from intermolecular zero quantum coherences (i-ZQCs) which are not phase encoded and additional phase cyc
A fast, efficient numerical algorithm is used to study intermolecular zero-quantum coherences (iZQCs) and double-quantum coherences (iDQCs) in two applications where the three-dimensional structure of the magnetization is important: high-resolution NMR in inhomogeneous fields and contrast enhancemen
Relaxation resulting from the modulation of dipolar interaction the quadrupolar interaction. It has been shown that, for 2 H is commonly used for estimating distances in molecules in soluand 23 Na in single crystalline solids, the transitions 0m } tions. However, for most nuclei with spin I ΓΊ 1 2 th