METHODS AND APPARATUS FOR DETERMINING THE POSITION OF A SPOT OF RADIATION AND INSPECTION APPARATUS
A beam (542, 556) of soft x-ray (SXR) radiation is generated by focusing infrared (IR) radiation (540) at a source location so as to generate the SXR radiation (542) by higher harmonic generation in a gas cell (532). An illumination optical system (512) focuses the SXR radiation into a spot (S) of r...
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