Soft x-ray transmission of thin film diamond: Applications to detectors and high pressure gas cells

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Abstract
Thin film diamond windows are emerging as a high technology answer for a variety of soft x-ray window applications for detectors and high pressure gas cells. This innovation provides a soft x-ray window with no measurable diffusion of gas between the high pressure (≳1 atm) and vacuum sides of the thin film diamond. Applications are discussed for soft x-ray fluorescence detectors as well as a high pressure in situ catalytic reactor for soft x-ray materials characterization at a synchrotron radiation source. We have measured the soft x-ray absolute transmission function of a thin film (0.3 to 0.5 μm) diamond window for the energy range between 275 and 750 eV using a gold photodiode at the National Synchrotron Light Source. The photodiode will be illustrated and the quantitative measurement technique fully outlined. X-ray transmission is found to be superior to other window technologies such as polymers or thin film beryllium and because of the inate high strength and thermal conductivity of diamond it has become the material of choice.

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