title: Some proposed improvements in the scanning ion microprobe.
abstract: Three improvements, which we have investigated, promise to lead to a scanning ion microprobe with a space resolution of about 15 nm. The improvements are: (1) use of a field-evaporation (EHD) ion source with liquid gallium to give a brightness exceeding 10(10) A m-2 sr-1 at 21 KeV, (2) a high efficiency (10%) collecting system for secondary ions, and (3) enhancement of the secondary-ion yield by cesium deposition. With this instrument, tracing with stable isotopes would offer a number of advantages over autoradiography.
mesh_terms: D001128:Argon; D002586:Cesium; D005708:Gallium; D007477:Ions; D007554:Isotopes; D013058:Mass Spectrometry / Q000295:instrumentation*
chemical_list: D007477:Ions; D007554:Isotopes; D002586:Cesium; D001128:Argon; D005708:Gallium