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THEORY OF STRAIN BROADENED LINE SHAPES OF SPIN RESONANCE AND OPTICAL ZERO PHONON LINES

STONEHAM, AM; (1966) THEORY OF STRAIN BROADENED LINE SHAPES OF SPIN RESONANCE AND OPTICAL ZERO PHONON LINES. P PHYS SOC LOND , 89 (4) 909 -921. 10.1088/0370-1328/89/4/314. Green open access

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Abstract

A number of spin resonance and zero phonon optical absorption lines are broadened by microscopic strains in the lattice containing the centres observed. In MgO, for example, the electron spin resonance line of Fe2+, the ENDOR line of Co2+ and the zero phonon lines of colour centres all show strain broadening. The strains appear to be due to dislocations and other crystal imperfections. It is shown that these line shapes can be calculated in terms of the statistical distribution of the imperfections and their individual strain fields. The approach can be generalized to cases where other broadening mechanisms are important, such as spin-spin interactions. The method may also be used to obtain information about the statistical distribution of the strain sources from the observed line shape. To illustrate the method the line shape of MgO: Fe2+ is calculated on the simple, if rather unrealistic, assumption of an isotropic homogeneous distribution of dislocations. The results are in fair agreement with experiment.

Type: Article
Title: THEORY OF STRAIN BROADENED LINE SHAPES OF SPIN RESONANCE AND OPTICAL ZERO PHONON LINES
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/0370-1328/89/4/314
Publisher version: http://dx.doi.org/10.1088/0370-1328/89/4/314
Language: English
Additional information: Text made available to UCL Discovery by kind permission of IOP Publishing, 2012
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/144811
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