Patent Number: 
Section: claims

1. Process for generation of a fog composed of droplets of a liquid, comprising: the nozzle opening up into an area in which the pressure is equal to or less than 10 xe2x88x922  Pa and thus generates a fog of liquid droplets with sizes of an order of 10 xcexcm to 30 xcexcm at an area at an exit from the nozzle, an average fog density being greater than or equal to 10 20  molecules/cm 3 , the fog being strongly confined on a center line of the nozzle. pressurizing the liquid at a pressure of an order of 5xc3x9710 5  Pa to 10 7  Pa; and  injecting the liquid thus pressurized into a nozzle with a diameter of between 20 xcexcm and 1 mm, 2. Process according to  claim 1 , wherein the nozzle is heated. claim 1 3. Process according to  claim 1 , further comprising focusing a laser beam on the fog, the laser beam configured to interact with the fog to generate light in an extreme ultraviolet range. claim 1 4. Process according to  claim 3 , wherein the laser beam is focused on the fog at a distance of an order of 1 mm to 10 mm from the nozzle. claim 3 5. Process to  claim 3 , wherein the light generated in the extreme ultraviolet range is used for insolation of a substrate on which a photoresist layer is deposited. claim 3 6. Device for generating a fog composed of droplets of a liquid, the device comprising: to thus generate a fog of liquid droplets in the vacuum chamber at an exit from the nozzle, with sizes of an order of 10 xcexcm to 30 xcexcm, an average fog density being greater than or equal to 10 20  molecules/cm 3 , the fog being strongly confined on a center line of the nozzle. a reservoir configured to contain the liquid;  means for pressurizing the liquid contained in the reservoir, by subjecting the liquid to a pressure of an order of 5xc3x9710 5  Pa to 10 7  Pa;  a nozzle having a diameter between 20 xcexcm and 1 mm and connected to the reservoir;  a vacuum chamber containing the nozzle; and  pumping means for setting up a pressure less than or equal to about 10 xe2x88x922  Pa in the vacuum chamber, 7. Device according to  claim 6 , further comprising means for heating the nozzle. claim 6 8. Device according to  claim 6 , wherein the means for pressurizing includes means for injecting a pressurized gas into the reservoir. claim 6 9. Device according to  claim 6 , wherein the nozzle includes a pulsing means for producing the fog in pulsed form. claim 6 10. Device according to  claim 6 , wherein the liquid is water. claim 6 11. Light source in an extreme ultraviolet range, comprising: the device according to  claim 6 ,  claim 6 means for generating a laser beam configured to interact with the fog generated using the device; and  means for focusing the laser beam on the fog. 12. Lithography apparatus for semiconducting substrates, comprising: wherein the light source in this apparatus is according to  claim 11 . claim 11 means for supporting a semiconducting substrate on which a photoresist layer is deposited that will be insulated according to a determined pattern;  a mask comprising the determined pattern in enlarged form;  a light source in an extreme ultraviolet range;  optical means for transmitting light to the mask, the mask supplying an image of the pattern in enlarged form; and  optical means for reducing the image and projecting the reduced image on the photoresist layer,