| 摘要 |
<p>A source for producing a spray of drops and ions of a liquid material under the action of an electric field, comprises an emitting point 4 in the shape of a cone with a rounded tip, the vertex angle of which is between thirty and forty degrees and which projects beyond a base structure by a distance of between some one and three millimetres, means for supplying a liquid material to be sprayed to the emitting point and a field generating electrode 6 whereby there may be applied to the emitting point an electric field sufficient to disrupt the liquid material at the emitting point and provide a spray of liquid drops and ions, the emitting point being made of a material which is wetted by the liquid material and has a low solubility in the liquid material. The liquid material is a molten metal, and examples of metals and suitable materials are given. <IMAGE></p> |
