激光诱导铜产生等离子体羽辉的颜色特性

为了研究等离子体羽的辐射特性,建立了激光诱导辐射模型。通过时空分辨光谱测量技术,测定了激光烧蚀铜诱导产生等离子体羽辉在氧气环境下的发射光谱及其发射强度随时间与空间的分布;利用快速照相法,拍摄了等离子体羽的照片。结果表明:等离子体羽光谱主要由Cu的原子谱线、一价离子谱线组成;其不同区域的颜色不同,且随环境气压而变化。认为等离子体羽的不同区域诱导发光机理不同,中心区域以连续辐射为主;中间区域以原子谱线和一价离子谱线为主;外围区域以原子谱线为主。连续辐射主要来自近靶处高能电子运动而产生的韧致辐射以及电子和一价离子的复合;一价离子谱线主要来自近靶处高能电子与一价离子碰撞传能;原子谱线主要来自电子与原子的碰撞传能以及近靶处电子与一价离子的复合。

Colour properties of plasma plume produced by pulsed laser ablating metal Cu

In order to study plasma plume radiation properties,a radiation model of plasma plume was established. Based on time and spatial-resolved measurements the plasma plume emission spectrum in oxygen by pulsed laser ablating copper was analyzed, and the photographs of plasma plume were given. The experimental results show that plasma emission spectra are primarily composed of atomic spectrum and univalent ion spectrum. The plasma plume has different colours in different regions,the region colour is changed with ambient gas pressure. The core region spectra are primarily composed of bremsstrahlung radiations, and the middle region spectra are primarily composed of atomic spectrum and univalent ion spectrum, while the outskirt region spectra are primarily composed of atomic spectra. The continuous background radiation comes from the bremsstrahlung radiation ejected from the electron moving near target and recombination of the electron and univalent ion near target, and the primary mechanism of atomic radiation is electron collision energy transfer and recombination of electron and univalent ion near target, while the primary mechanism of univalent ions radiation is electron collision energy transfer.