Water window
Script error: No such module "Distinguish". The water window is a region of the electromagnetic spectrum in which water is transparentScript error: No such module "Unsubst". to soft x-rays. The window extends from the K-absorption edge of carbon at 282 eV (68 PHz, 4.40 nm wavelength) to the K-edge of oxygen at 533 eV (129 PHz, 2.33 nm wavelength). Water is transparent to these X-rays, but carbon and its organic compounds are absorbing. These wavelengths could be used in an x-ray microscope for viewing living specimens.[1][2] This is technically challenging because few if any viable lens materials are available above extreme ultraviolet.
See also
References
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