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采用二维成像光谱仪系统,研究了铜(样品)和不同氪、氩或氦气压下激光诱导等离子体气体的发射强度空间分布。发射区的形状和强度完全取决于等离子体气体的种类和气压。这些等离子体气体的发射区基本上集中在样品表面附近,而铜样品的发射区则朝周围的气体扩展。氩或氪气压越高,铜线的发射强度越强;而对于氦等离子体,气压越大,铜线的发射强度越弱。上述效应可以通过氪、氩和氦在碰撞激发剖面图上的差别来解释。
A two-dimensional imaging spectrometer system was used to study the spatial distribution of laser-induced plasma gas emission intensity for copper (sample) and krypton, argon or helium pressures. The shape and intensity of the emitter depends entirely on the type of plasma gas and the pressure. The emission area of these plasma gases is essentially centered around the sample surface, while the emission area of the copper sample expands toward the surrounding gas. The higher the argon or krypton pressure, the stronger the emission intensity of the copper wire; and for the helium plasma, the greater the pressure, the weaker the emission intensity of the copper wire. The above effects can be explained by the differences in collisional excitation profiles of krypton, argon and helium.