摘要
研制了一套等效噪声吸收可达3×10^-9 cm^-1的连续波光腔衰荡光谱装置。用该装置对介质阻挡放电等离子体中的OH自由基和水进行了原位定量测量，考察了OH自由基数密度随气压和放电电压以及放电频率的变化情浣。实验结果表明，在（2．13～22．0）×10^3Pa范围内，随着气压增加，OH自由基数密度在气压较低时增加；而在较高气压时由于H2O的解离吸附作用使得体系中电子密度减小，OH自由基数密度随之减小。随放电电压和放电频率增加介质阻挡放电等离子体中电子密度和电子能量增加而导致OH数密度增加。
An apparatus of continuous wave cavity ring-down spectroscopy （cw-CRDS） has been constructed with the noise （RMS） equivalent absorption 3×10^-9 cm^-1. In situ quantitative measurements of-OH radicals in dielectric barrier discharge （DBD） plasmas at low pressure using cw-CRDS are described. The influence of discharge voltage and pressure on number density of OH has been investigated. Results show that the OH production increases at low pressure with increasing discharge pressure; however, the number density of OH decreases due to electron attachment of H2O at higher pressure. The number density of OH radical increases with increasing discharge voltage and discharge frequency because of the increase of electron density and electron energy.
出处
《核聚变与等离子体物理》
CAS
CSCD
北大核心
2008年第2期167-171,共5页
Nuclear Fusion and Plasma Physics
基金
国家自然科学基金(10475015)资助课题
关键词
光腔衰荡光谱
红外光谱
OH
介质阻挡放电
Cavity ring-down spectroscopy
Infrared spectroscopy
OH
Dielectric barrier discharge
