Magnetic circular dichroism spectroscopy and magnetization studies of iron atoms isolated in xenon matrices

摘要

Absorption and magnetic circular dichroism (MCD) spectra of iron atoms isolated in xenon matrices have been measured and their magnetization properties studied. The high signal intensity and optical quality of the matrices has allowed the assignment of many more transitions than hitherto. The magnetization measurements reveal considerable guest host interaction, though there is little evidence of this in the spectra. Detailed analysis of the magnetization data shows that they can be interpreted quite well in terms of an essentially axial crystal field splitting of the5D4ground state which places the two Verbar;MJVerbar;=4 levels about 100 cmminus;1below the Verbar;MJVerbar;=3. By extending the theoretical treatment to include a small mixing of the two Verbar;MJVerbar;=4 levels it is possible to improve the fit of the higher temperature data. These results demonstrate the value of MCD measurements, particularly where a system is electron paramagnetic resonance (EPR) silent.