First realisation and characterization of caesiated samples

Cesium deposition on molybdenum samples (foils with a 15 mm side square useful area) for monolayer or multilayer analysis requires manipulation of samples in a controlled atmosphere and an evaporator installation which can protect oven and sample from air venting, during sample transfer. The prototype of the NIO1 oven (developed at INFN - LNL) is particularly suitable for this task since is has a closing valve, capable of withstanding over 500 K (either open or closed, with regulation performed with oven turned off). Additional equipment for a miniaturized deposition chamber (just requiring a cold DN16KF pumping port) is described. Anyway making films of few layers requires careful scheduling of oven thermal cycle. For that purpose, a more elaborate deposition chamber, with shutter and film deposition monitor (based on piezoelectric resonating crystals, as usual in accurate measurement ) is planned. In perspective the potential operational advantages of evaporators filled with solid pellets (porous mixtures of cesium chromate and getter Zr alloys) should be noted, both as general purpose accessory of ion sources and for the specific task of sample preparation; in return, Mo sample preparation may offer a validation and comparisons of traditional and pellet - based Cs evaporators.