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MOMENT MAGNETIQUE NUCLEAIRE [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 1985-03-22

English

Subject field(s)
  • Chemistry
  • Analytical Chemistry
CONT

The most important consequence of the extraordinary sharpness of nuclear magnetic resonance (NMR) lines in liquids, caused by motion narrowing, is the possibility of measuring the chemical shifts; that is, the separation between NMR lines from nuclear spins of the same species but in different molecular environments.

CONT

The extensive use of NMR in molecular structure determinations arises from the slight shift in the resonance frequency of an atom - commonly that of a proton - due to the environment of neighboring atoms. Because the magnitude of this shift depends on the type of environment, it is called the chemical shift.

French

Domaine(s)
  • Chimie
  • Chimie analytique
CONT

Résonance magnétique nucléaire(R. M. N.). Les spectres de résonance nucléaire mettent en évidence les différences d’énergie des spins nucléaires des molécules en présence d’un champ magnétique. Les raies spectrales correspondantes qui se trouvent dans le domaine hertzien pour des champs de quelques milliers de gauss permettent d’atteindre deux grandeurs moléculaires importantes : les déplacements chimiques(...) qui sont dus à la création de champs magnétiques locaux, légèrement différents du champ magnétique appliqué, liés au moment diamagnétique induit de la molécule. La méthode est très sensible à de toutes petites modifications de ce champ local, de telle sorte que les raies de résonance de chaque noyau dépendent fortement de leur environnement chimique.

Spanish

Save record 1

Record 2 1975-03-11

English

Subject field(s)
  • Analytical Chemistry
  • Chemistry
OBS

the low-energy orientation [of a nucleus] corresponds to that state in which the -- is aligned parallel to the [ field.]

French

Domaine(s)
  • Chimie analytique
  • Chimie
OBS

soit un noyau possédant un spin 1 et un --.

Spanish

Save record 2

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