The present invention relates to the S-isomers of anesthetic compounds, the methods of treatment therewith, the compounds being useful for inducing local anesthesia, analgesia and sleep. It is well known that a multiple anode detector capable of detecting different fractions of the incoming particles may be used to increase the dynamic range of a TOFMS system. The thyristor structure is further configured so that a power density of the radiation needed for turning on the thyristor structure is lower than a power density of the radiation needed for a change of data of the circuit used for storing or processing data.