A Molecular Study on Laser Ablation Dynamics of Organic Solids

通过测量激光烧蚀后的时间分辨发光光谱，研究了π电子固体和氧化物超导材料的激光烧蚀动力学。聚（N-乙烯基咔唑）和掺杂的聚（甲基丙烯酸甲酯）薄膜揭示了从准分子和三重态到等离子体条件的时间演化。虽然某些氧化物超导体的烧蚀动力学非常复杂，但我们获得了一些关于碎裂原子和离子的电子态的信息。辐照后，等离子体中的原子和离子立即处于电子基态，然后它们处于各种激发态。类似的研究也进行了激光退火，这被认为是激光烧蚀的前驱过程。从分子和电子的角度揭示了形态变化与光过程的关系。

Laser ablation dynamics of pi-electronic solids and oxide superconducting materials has been studied by measuring time-resolved luminescence spectra just upon laser ablation. Poly(N-vinylcarbazole) and doped poly(methyl methacrylate) films reveals time evolutions from excimer and triplet states to plasma condition. Although ablation dynamics of some oxide superconductors is very complex, we obtained some information on the electronic states of fragmented atoms and ions. Immediate after irradiation, atoms and ions in the plasma are in the electronic ground state, then they are in the various excited states. Similar studies are also conducted for laser annealing which is considered to be a precursor process of laser ablation. A relation between morphological change and photoprocess was revealed from molecular and electronic view points.