X-ray emission analysis of a plasma source using an yttrium and a mylar target for the generation of 2.48Â nm wavelength microbeam

► The X-ray beam is generated from a plasma produced focusing a Nd-Yag/glass laser beam on mylar or yttrium target. ► At the wavelength of 2.48 nm, a monochromatic soft X-rays beam was collected by multilayer spherical mirrors. ► In the Water Window region, Yttrium represents a good X-ray emitter.