cesium-vapor Penning source

cesium-vapor Penning source

[′sē·zē·əm ¦vā·pər ′pen·iŋ ‚sȯrs]
(electronics)
A conventional Penning source modified for negative-ion generation through the introduction or a third, sputter cathode, made from or containing the element of interest, which is the source of negative ions, and through the introduction of cesium vapor into the arc chamber.