Abstract: A radiation sensor for use with a lithographic apparatus is disclosed, the radiation sensor comprising a radiation-sensitive material which converts incident radiation of wavelength ?1 into secondary radiation; and sensing means capable of detecting the secondary radiation emerging from said layer.

Abstract: Disclosed is a hydrogen storage material comprising a magnesium hydride. Said magnesium is stabilized in the fluorite structure. Preferably, the magnesium is at least partly substituted by an element such that the magnesium hydride is stabilized in the fluorite structure. In an advantageous embodiment, the hydrogen storage material also comprises a catalytically active material. Furthermore, an electrochemically active material, as well as an electrochemical cell comprising the above hydrogen storage material are disclosed.

Abstract: A low-pressure mercury vapor discharge lamp is provided with a light-transmitting discharge vessel (10), enclosing, in a gastight manner, a discharge space (11) provided with a filling of mercury and a rare gas. The discharge vessel (10) comprises means (41A) for maintaining a discharge in the discharge space (11). At least a portion of an inner wall of the discharge vessel (10) is provided with a translucent layer (16), which according to the invention has a thickness in the range from 1 to 50 (m and comprises an alkaline earth borate. Starting materials for the translucent layer (16) are nano-particles of calcium strontium, and/or barium borate, enabling the production of such thick translucent layers. Preferably, the discharge vessel (10) is made from a sodium-rich or a soda lime glass with a glass composition comprising the following essential constituents: 60 to 80% SiO2 and 10 to 20% Na2O by weight.