An ECR ion-beam source for use in an ion implanter has a sealed plasma chamber in which plasma is excited by microwave radiation of 2. The transition duct has an inner liner and an impingement sleeve positioned radially outward with a passageway formed therebetween. Therefore, the status in terms of whether access is free for each available content item relative to each user is tracked using a tracking database. Next, a conductive layer is filled in the trench. The best fitting function is selected from the generated functions and used to determine the time at which the particular resource pool will become depleted. The lithium-material comprises an intermetallic lithiumtransition metal pnictide phase, wherein the transition metal present in said lithiumtransition metal pnictide phase is a metal of one of the columns IVa and Va of the periodic table of the elements.