Reflection Grating Spectrometer
A reflection grating spectrometer works in a very similar way as an optical
prism does, by spreading out the incoming light according to the wavelength
of the photon. In fact, in the case of XMM, the reflection gratings are
nothing more than mirrors with tiny grooves on them. The mirrors are covered
with a gold layer, and there are 600 grooves per millimeter: so thin that
one single human hair would cover 15 of them! Once dispersed out into
a spectrum, the X-rays are focused on the two RGS cameras. These cameras
share the telescope focusing plane with the EPIC cameras.
More images of the RGS
If you have any questions concerning XMM-Newton send e-mail to firstname.lastname@example.org.