激光击穿氧气的等离子体光谱时间演化特性研究(英文)

Spectral Temporal Development of Laser-Induced Oxygen Plasmas

在300～900 nm范围内,对激光击穿氧气的等离子体光谱进行了探测,研究了其时间演化特性.发现在等离子体形成的初期,辐射的主要成分是在很强的连续谱背景下混合着O2,O2^＋和O^＋激发的线状谱.在等离子体形成后的5μs,只剩下氧原子谱,其最长寿命可达30μs.实验结果表明：光谱中的不同成份按照不同的时间特性衰减.

The spectra of the laser-induced oxygen plasmas are detected in the range of 300～900 nm. The spectral temporal behavior is investigated. At initial stage of plasma forming, the dominating radiation is a strong continuous background mixed with some lines of excited O2, O2^＋ and O^＋. After 5μs of plasma initiation, only the atomic oxygen spectra remain. The longest lifetime of O could reach 30μs. The experimental results show that different components of the spectra attenuate according to disparate mode along with temporal development. The track of energy transfer is discussed.