A new discharge nozzle for spectroscopic studies in supersonic jets
A new discharge nozzle for spectroscopic studies in supersonic jets
复制标题
DOI：
10.1039/ft9969203023
复制
发表时间：
1996-09
期刊：
影响因子：
--
通讯作者：
A. Bezant;D. Turner;Guy Dormer;A. Ellis
中科院分区：
文献类型：
--
作者：
A. Bezant;D. Turner;Guy Dormer;A. Ellis
我们描述了一种新的喷嘴，用于脉冲超音速射流中反应物质的光谱研究。这种喷嘴被设计成一种廉价的替代激光烧蚀方法来生产含有金属的物质。它使用放电，通过在阴极上溅射Ar离子来产生金属原子。然后，这些金属原子可以与适当的试剂混合，在膨胀到真空中之前产生含有金属的物种。当使用含碳试剂时，为了避免快速碳沉积到金属源电极上，反应前驱体必须远离金属溅射区。因此，开发了一种双通道喷嘴，其中两个脉冲气源在膨胀之前在公共点混合。这一点已经通过制备一些光谱特征良好的含金属物种进行了测试。结果表明，这种喷嘴是一种可行的替代激光烧蚀产生含金属物质的方法。利用激光诱导荧光获得的光谱数据表明，该喷嘴具有良好的脉冲间稳定性，在需要电极补充之前可以将信号幅度保持在>；80h。
We describe a new nozzle for spectroscopic studies of reactive species in pulsed supersonic jets. This nozzle was designed as a cheap alternative to laser ablation methods for producing metal-containing species. It employs an electrical discharge to produce metal atoms by argon ion sputtering at the cathode. These metal atoms can then be mixed with appropriate reagents to produce metal-containing species before expansion into vacuum. To avoid rapid carbon deposition onto the metal source electrode when carbon-containing reagents are used, the reactive precursor must be kept away from the metal-sputtering region. Consequently, a dual channel nozzle has been developed in which two pulsed gas sources are mixed at a common point prior to expansion. This has been tested by preparing a number of spectroscopically well characterised metal-containing species. The results show that this nozzle is a viable alternative to laser ablation for producing metal-containing species. The spectroscopic data, obtained using laser-induced fluorescence, demonstrate that the nozzle has good pulse-to-pulse stability and can maintain signal amplitude for > 80 h before electrode replenishment is required.