| 摘要 |
<p>An ion source for generating ions of a gas or vapour, especially for thinning solid state samples, comprising a housing (28), means for introducing (31) said gas or vapour into said housing (28), an anode (3) positioned within said housing (28), said anode (3) having a rotationally symmetrical cavity (21) being open at both sides along the axis (30) of the source, first and second electrooptical mirror means (1, 2; 5, 4) disposed along said axis (30) and defining therebetween a space within which said anode (3) is positioned, said first and second electrooptical mirror means (1, 2; 5, 4) creating an electrostatic field so as to cause electrons to oscillate between them, wherein at least one of said first and second electrooptical mirror means (1, 2; 5, 4) being apertured for exit therethrough of a fraction of ions generated in said space. The ion source further comprises means for generating electrons (12) disposed at one of said sides of said cavity (21) and positioned outside said space, and means for causing said generated electrons to move into said cavity (21).</p> |
