In order to prevent {TAIL ~ 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 the sample should be a fully reflecting surface, rather than a transparent lens 
In order to prevent { TAIL ~ 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 the sample should be a fully reflecting surface , rather than a transparent lens
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH