a source of ions for an analyzer includes a reservoir for containing a liquid and a channel having a first end opening into the reservoir . a nozzle element adjacent a second end of the channel includes a plurality of tips for producing individual droplets from the liquid . the plurality of tips reduces the likelihood that individual droplets will coalesce , increases the overall flow of material or analyte to the mass spectrometer and provides a level of redundancy in the delivery of liquid for producing droplets . the tips also may produce a higher current output and greater signal from the system , as well . with micro - miniaturization , the individual droplets are relatively small , thereby increasing the likelihood that ions would be ejected from the droplet surfaces under the influence of an electric field . multiple nozzle elements can be used to more selectively deliver fluid droplets to the analyzer , or to increase the overall flow rate of droplets from the reservoir . the tips may have a volcano or truncated cone shape for the desired fluid delivery , electrostatic effects and manufacture ability .