飞秒laser烧蚀产生的硅团簇：非热发射和气相凝聚
Silicon clusters produced by femtosecond laser ablation: Non-thermal emission and gas-phase condensation
摘要：
利用飞秒激光在真空中烧蚀体硅产生了中性硅团簇Si_n（n = 7）及其阳离子Si_n+（n = 10），并利用飞行时间质谱对其进行了研究。在烧蚀羽流中可以清楚地分辨出两种不同速度和丰度分布的Si_n ~+团簇。讨论了团簇形成的可能机制（库仑爆炸、气相凝聚、相爆炸）。
英文摘要：
Neutral silicon clusters Si_n (up to n = 7) and their cations Si_n+ (up to n = 10) have been produced by femtosecond laser ablation of bulk silicon in vacuum and investigated using time-of-flight mass spectrometry. Two populations of the Si_n+ clusters with different velocity and abundance distributions in the ablation plume have been clearly distinguished. Possible mechanisms of cluster formation (Coulomb explosion, gas-phase condensation, phase explosion) are discussed.
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