Abstract
We have measured light emission from the transition metal iron, the results indicating that light emission from this transition metal is due to the radiative transitions of tunnel carriers. The isochromat spectra taken at negative sample bias voltages show characteristic features that agree with the theoretically calculated density-of-states and photoemission results. Moreover, the peaks of isochromat spectra are shifted with the photon energies. This method should be useful for probing the spin-polarized d-states of ferromagnetic transition metals by measuring the intensity and circular polarization of emitted light induced with a scanning tunneling microscope.
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