In order to prevent spurious radiation from reaching the detector in {HEAD ~ the reflectance mode}, any optical element which shapes or directs the radiation path on its way from the beam dividing mirror to {TAIL ~ the sample} should be a fully reflecting surface, rather than a transparent lens 
In order to prevent spurious radiation from reaching the detector in { HEAD ~ the reflectance mode } , any optical element which shapes or directs the radiation path on its way from the beam dividing mirror to { TAIL ~ the sample } should be a fully reflecting surface , rather than a transparent lens
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