The experiment shows, when the background gas pressure is less than 400 Pa,a bright emission small sphere exists before the target surface, and the diameter of the sphere is much larger than the size of the laser ablated point.
英
美
- 實(shí)驗發(fā)現 ,當背景氣壓為 40 0Pa以下時(shí) ,在靶面上存在一個(gè)明亮的發(fā)光球體 ,球體直徑遠大于激光燒蝕斑的大小 ,此球體向四周輻射等離子體光譜 ,只是在垂直靶面的方向輻射相對較強。
