Chemistry Reference
In-Depth Information
Fig. 2.1 a Room temperature Mössbauer spectrum of Fe
2
O
3
. b Schematic representation of the
nuclear sub states of the ground and the 14.4 keV excited states of
57
Fe bound in metallic iron
(left), Fe
2
O
3
(middle) and stainless steel (right)[
5
]
2.2 Hyperfine Interactions and Mössbauer Parameters
Three kinds of hyperfine interactions may be observed in a Mössbauer spectrum:
Electric monopole interaction between protons of the nucleus and electrons
(mainly s-electrons) penetrating the nuclear field. The observable Mössbauer param-
eter is the ''isomer shift d''. Isomer shift values give information on the oxidation state,
spin state, and bonding properties such as covalency and electronegativity.
