Characteristics of coherent forward scattering spectrometry in Faraday configuration measured with a diode laser on the 842.5 nm Ar I and 844.6 nm O I lines
Characteristics of coherent forward scattering spectrometry in Faraday configuration measured with a diode laser on the 842.5 nm Ar I and 844.6 nm O I lines
复制标题
使用二极管激光器在 842.5 nm Ar I 和 844.6 nm O I 线上测量的法拉第配置相干前向散射光谱测定的特征
DOI：
10.1016/j.sab.2016.09.015
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Hideyuki Matsuta
中科院分区：
文献类型：
--
作者：
Hideyuki Matsuta
本文研制了一种具有法拉第结构永磁体的相干前向散射（CFS）光谱仪。钕环形磁体（Nd-Fe-B）被用来施加一个外部磁场的射频（RF）辉光放电。研究了单磁体和双磁体对CFS传输强度的影响。得到的Ar I 842.46 nm线上CFS信号强度解析曲线随氩气分压的3.34±0.17次幂上升，大于理论预期的二次斜率。此外，844.6 nm原子氧谱线（33P-33S）作为一个从短寿命低能级（寿命= 1.74 ns）弱吸收跃迁的例子进行了研究。尽管存在能级反转和较短的低能级，但仍能检测到oi 844.6 nm的吸收跃迁，并成功记录了惰性气体o2rf辉光放电的分析曲线。氖气的分压为1.65±0.24次，氩气为1.95±0.05次，氦气为2.15±0.23次，CFS信号强度随之升高。估计值接近理论期望的二次相关性。
In this study, a coherent forward scattering (CFS) spectrometer with permanent magnets in the Faraday configuration was developed. Neodymium ring magnets (Nd–Fe–B) were used to apply an external magnetic field to a radio frequency (RF) glow discharge. The effect of using a single or double magnet configuration on the transmitted CFS intensity was investigated. The resulting analytical curve of the CFS signal intensity on the Ar I 842.46 nm line rises with the 3.34 ± 0.17-th power of the argon partial pressure, which is larger than the theoretically expected quadratic slope. In addition, an 844.6 nm atomic oxygen line (33P–33S) is investigated as an example of a weak absorption transition from the short-lived lower level (lifetime = 1.74 ns). Despite the population inversion and the short-lived lower level, the absorption transition of O I 844.6 nm could be detected, and analytical curves in noble gas–O2RF glow discharges were recorded successfully. The CFS signal intensities rose with the 1.65 ± 0.24-th power of the partial pressure of O2in neon, with the 1.95 ± 0.05-th power in argon, and with the 2.15 ± 0.23-th power in helium. The estimated values are close to the theoretically expected quadratic dependence.