Accession Number : AD0262088

Title :   ZERO FIELD SPLITTINGS OF DIFFERENT IRON COMPLEXES

Corporate Author : UNIVERSITY COLL OF NORTH STAFFORDSHIRE KEELE (ENGLAND)

Report Date : 31 JUL 1961

Pagination or Media Count : 1

Abstract : The experimental and theoretical requirements for an analysis of crystal field splittings are indicated. The experimental technique requires a microwave spectrometer which is capable of a large frequency sweep. Theoretical calculations when compared to the results of direct zero field absorption have shown that extrapolation methods give a discrepancy larger than that estimated from experimental error. The frequency dependence of microwave components has led to the development of a coaxial system to work over the whole of the X band frequency range. The sensitivity of the equipment in terms of the spins detectable is lower than that of a fixed frequency spectrometer employing a high Q cavity. A frequency mo ulation system was constructed to give high sensitivity to the electronic detection equipment. A low frequency system was also arranged to enable the signal to be displayed on a video system. Frequency sweeps of 2 and 2.5 gc were achieved and the resonance condition continuously satisfied for a sample of D.P.P.H., over these ranges. A swept dc magnetic field was used to split the states of this sample. (Author)

Descriptors :   *COMPLEX COMPOUNDS, *IRON COMPOUNDS, *MASERS, *MICROWAVE SPECTROSCOPY, *PARAMAGNETIC MATERIALS, *SPECTROPHOTOMETERS, BERYLLIUM COMPOUNDS, CAVITY RESONATORS, CRYSTAL DETECTORS, CRYSTAL LATTICES, ELECTRODES, ELECTRON TRANSITIONS, FREQUENCY MODULATION, GALLIUM, GARNET, HELIXES, IONS, MAGNETIC FIELDS, MICROWAVE AMPLIFIERS, MICROWAVE NETWORKS, MODULATION, RESONANCE ABSORPTION, SAPPHIRE, X BAND, YTTRIUM

Distribution Statement : APPROVED FOR PUBLIC RELEASE