Publication

Single-transition-to-single-transition coherence transfer by cross-polarization: quantitation of cross-correlation effects in nmr

Geoffrey Bodenhausen
2001
Patents

Abstract

A method of NMR spectroscopy for achieving selective single-transition-to-single-transition cross-polarization (ST-CP) between two selected transitions in systems with two or more coupled spins comprises the following steps: 1) Choose RF pulses suitably shaped for a selective excitation expt. with an RF amplitude that is weaker than the scalar coupling const. JIS of the I and S spin systems; 2) Simultaneously stimulate a pair of connected transitions of the I and S spin systems; 3) Record the response for the said selective excitation expt. and observe different pairs of connected transitions. The method proposed is quite general provided the selectivity is sufficient to consider the relevant three-level subsystem to be isolated from all other energy levels. The method will be particularly useful to study differential relaxation of different multiplet components. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/f06cf582-2b7a-4b83-bb94-3827e724c4da

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Geoffrey Bodenhausen
2001
Patents

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/f06cf582-2b7a-4b83-bb94-3827e724c4da

About this result

Related concepts (4)

Phase transition

In chemistry, thermodynamics, and other related fields, a phase transition (or phase change) is the physical process of transition between one state of a medium and another. Commonly the term is used to refer to changes among the basic states of matter: solid, liquid, and gas, and in rare cases, plasma. A phase of a thermodynamic system and the states of matter have uniform physical properties. During a phase transition of a given medium, certain properties of the medium change as a result of the change of external conditions, such as temperature or pressure.

Differential scanning calorimetry

Differential scanning calorimetry (DSC) is a thermoanalytical technique in which the difference in the amount of heat required to increase the temperature of a sample and reference is measured as a function of temperature. Both the sample and reference are maintained at nearly the same temperature throughout the experiment. Generally, the temperature program for a DSC analysis is designed such that the sample holder temperature increases linearly as a function of time.

Liquid crystal

Liquid crystal (LC) is a state of matter whose properties are between those of conventional liquids and those of solid crystals. For example, a liquid crystal may flow like a liquid, but its molecules may be oriented in a crystal-like way. There are many types of LC phases, which can be distinguished by their optical properties (such as textures). The contrasting textures arise due to molecules within one area of material ("domain") being oriented in the same direction but different areas having different orientations.