Accession Number : AD0624444

Title :   COVALENCY PARAMETERS AND THE G FACTOR FOR NI(2+): KMGF3,

Corporate Author : CALIFORNIA UNIV LOS ANGELES DEPT OF PHYSICS

Personal Author(s) : Huang,Nai Li ; simanek,E.

Report Date : 1965

Pagination or Media Count : 13

Abstract : The covalency parameter, a, in the excited state of Ni(2+): KMgF3(d(8), t(2)(5)eg(3)) is determined from the experimental EPR values for the g shift, b and c in the ground level (d(8), t(2)(6)eg(2)). The procedure involves evaluation of small terms in the orbital reduction factor which have hitherto been neglected and which can contribute significantly in more covalently bonded salts. The value of a = 0.32 obtained by this method is remarkably close to the EPR value for b = 0.31, and indirectly supports the argument for cancellation of the spin densities in the sigma and pi orbitals of the fluorine ions in manganese salts. It is suggested that the large pi-bonding arises from the anion crystal field splitting which is important when the promotion energy for the electron transfer is sufficiently small. The contribution to the g factor coming from an electron transfer process is formulated for Ni(2+): KMgF3 but is to be small for this case. (Author)

Descriptors :   (*CHEMICAL BONDS, MOLECULAR ORBITALS), (*MAGNETOOPTICS, MOLECULAR ORBITALS), POTASSIUM, MAGNESIUM COMPOUNDS, FLUORIDES, NICKEL, MOLECULAR STRUCTURE, VALENCE, EXCITATION, PARAMAGNETIC RESONANCE

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE