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利用脉宽为25ns的脉冲Nd:YAG532nm的激光,在10~(10)—10~(11)W/cm2的强度下,用飞行时间质谱对丙酮团簇的激光电离过程进行了研究.观察到了较强的O~(q+)(q=2—4)和C~(q+)(q=1—4)高价离子信号,这些高价离子C~(4+),C~(3+),C~(2+),O~(4+),O~(3+),O~(2+)的最大概然平动能分别为240eV,70eV,30eV,90eV,80eV,40eV.高价离子的强度和平动能随激光强度的增大而增大.我们提出一个多光子电离引发,逆韧致吸收加热-电子碰撞电离模型来解释高价离子的产生.
The laser ionization of acetone clusters was studied by time-of-flight mass spectrometry using a pulsed Nd: YAG 532nm laser with a pulse width of 25ns at 10 ~ (10) -10 ~ (11) W / cm2. (4 +), C ~ (3 +), C (+) and C (q +) The maximum kinetic energy of ~ (2 +), O ~ (4 +), O ~ (3 +) and O ~ (2+) are 240eV, 70eV, 30eV, 90eV, 80eV and 40eV respectively. The kinetic energy of peace increases with the increase of laser intensity.We propose a multi-photon ionization-induced, inverse Johnson-induced absorption-heating-electron impact ionization model to explain the generation of high-valent ions.