SXSPM Research | Highlights

Detection of photoejected electrons in the far field

When a sample surface is illuminated by monochromatic synchrotron x-rays, electrons will be ejected into the vacuum. Additionally, electrons can be elevated to unoccupied states close to Fermi energy. Thus, a probe that is tunneling over a sample surface during x-ray illumination will see a complex mix of contributions to the tip current ISXSTM. In order to better understand the underlying processes we have quantitatively studied the bias dependent photoelectron collection in the far field, where quantum mechanical tunneling does not contribute. It was found that a small bias between tip and sample allows an accurate and effective control of background currents as well as the desired signal obtained at absorption edges.

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APS

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