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Variable‐included‐angle varied‐line‐spacing plane‐grating monochromators (VIA‐VPGM) have been applied to many beamlines because of the self‐focusing and aberration‐correction function of the varied‐line‐spacing grating. Unfortunately, to optimize the variable‐line‐spacing coefficient of the grating, the fixed‐focus constant (Cff) has to be fixed first in the VIA‐VPGM. In this way, some of the advantages...
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