- Zero field splitting
**Zero field splitting**describes various interactions of the energy levels of an electron spin (S>1/2) even in the absence of an applied magnetic field. It is important in theelectron spin resonance of biological molecules.The value of the ZFS parameter is usually defined as D. Values of D have been obtained for a wide number of organic biradicals by EPR/ESR measurements. This value may be measured by other magnetometry techniques such as SQUID, however EPR measurements provide more accurate data in most cases.

For an S = 1 spin system, the value of D is the energy separation between the lowest-lying triplet and singlet states in the absence of an applied field. Therefore, when D is sufficently large triplets may absorp microwave radiation. One example of this is the microwave spectrum of oxygen.

**External Links**A description of the origins of this effect may be found at: [

*http://www.ncsu.edu/chemistry/das/zero-field_splitting.pdf*] (Notice, Kramers doublets cannot be split by ZFS, only magnetic field (i.e. Zeeman effects) can do that! I would recommend reading regular scientific journals for complete and adequate description of ZFS.

*Wikimedia Foundation.
2010.*

### Look at other dictionaries:

**zero-field splitting**— belaukis suskilimas statusas T sritis fizika atitikmenys: angl. zero field splitting vok. feldlose Aufspaltung, f rus. расщепление в отсутствие поля, n pranc. séparation de champs nuls, f … Fizikos terminų žodynas**Splitting of prime ideals in Galois extensions**— In mathematics, the interplay between the Galois group G of a Galois extension L of a number field K, and the way the prime ideals P of the ring of integers OK factorise as products of prime ideals of OL, provides one of the richest parts of… … Wikipedia**Field (mathematics)**— This article is about fields in algebra. For fields in geometry, see Vector field. For other uses, see Field (disambiguation). In abstract algebra, a field is a commutative ring whose nonzero elements form a group under multiplication. As such it … Wikipedia**Field extension**— In abstract algebra, field extensions are the main object of study in field theory. The general idea is to start with a base field and construct in some manner a larger field which contains the base field and satisfies additional properties. For… … Wikipedia**Glossary of field theory**— Field theory is the branch of mathematics in which fields are studied. This is a glossary of some terms of the subject. (See field theory (physics) for the unrelated field theories in physics.) Definition of a field A field is a commutative ring… … Wikipedia**Finite field**— In abstract algebra, a finite field or Galois field (so named in honor of Évariste Galois) is a field that contains only finitely many elements. Finite fields are important in number theory, algebraic geometry, Galois theory, cryptography, and… … Wikipedia**Heegaard splitting**— In the mathematical field of geometric topology, a Heegaard splitting is a decomposition of a compact oriented 3 manifold that results from dividing it into two handlebodies. The importance of Heegaard splittings has grown in recent years as more … Wikipedia**Division by zero**— This article is about the mathematical concept. For other uses, see Division by zero (disambiguation). The function y = 1/x. As x approaches 0 from the right, y approaches infinity. As x approaches 0 from the left, y approaches negative … Wikipedia**Parity of zero**— Zero objects, divided into two equal groups Zero is an even number. In other words, its parity the quality of an integer being even or odd is even. Zero fits the definition of even number : it is an integer multiple of 2, namely 0 × 2. As a… … Wikipedia**Quadratic field**— In algebraic number theory, a quadratic field is an algebraic number field K of degree two over Q. It is easy to show that the map d ↦ Q(√d) is a bijection from the set of all square free integers d ≠ 0, 1 to the set of… … Wikipedia