准分子激光轰击Y-Ba-Cu-O高温超导靶的空间分辨光谱研究

Space-resolved spectroscopy studies of excimer laser ablation of Y-Ba-Cu-O superconducting target

采用WP4-光学多道分析仪对准分子激光轰击Y_1Ba_2Cu_3O_x超导靶产生的等离子体辐射进行了空间分辨测量和研究。实验结果表明,在靶面的邻近区(d<0.4mm),等离子体辐射为较强的连续谱,并迭加有Y、Ba原子和Y^+、Ba^+离子基态电子跃迁的自吸收线。Y、Ba、Cu原子和相应的一价离子以及金属氧化物分子激发态的发射谱线仅在距靶面为0.4mm以外的区域出现。光谱的测量结果支持靶面表层发生爆炸、出射分子簇团和固体微粒的激光烧蚀沉积动力学机制解释。

Space-resolved luminescence spectra of excimer laser ablation of high Tc Y-Ba -Cu-O superconducting target was studied with WP4-optioal multichannel analyzer. In the vicinity region of the target surface (d<0.35mm), a wide continuum spectrum with salf-absorption lines due to the electronic transition from the ground states of Y, Ba and Y+, Ba+ was observed. The excited state emission spectrum lines of atoms, ions and moleoulae were detected only at the distance larger than 0.35mm. These experiment results support the dynamic explanation of explosion and ejecting molecular cluster or solid fragments on laser ablation.