射流式单重态氧发生器研究

单重态氧O2(a1△g)是迄今唯一能用纯化学反应高效产生的具有长寿命的亚稳激发态分子.为了考察提出的用两个O2(1△)能量汇集反应生成氧第二单重激发态O2(b1∑+g)以实现近可见短波长化学激光方案的现实性,设计和实验了一个氯流量为3～10 mmol/s的射流式单重态氧发生器(JSOG).考察了三种具有不同孔径和孔数目的喷头、氯气流量和脱水冷阱温度等对JSOG出口的O2(1△)浓度、O2(1△)分压、氯利用率及水蒸气含量的影响.发现用聚氯乙烯管作冷阱时,最佳冷阱介质温度为-140～-150℃,对此提出了O2(1△)表面脱活与脱水互相竞争的解释.在最佳条件下,可将O2(1△)气中水分压降低至4 Pa,这一结果是首次报导.

Investigation of the Performance for a Jet Singlet Oxygen Generator

So far, metastable Singlet oxygen is the only electronic excited state molecule that can be efficiently produced simply by a chemical reaction. To examine the proposal for a chemical laser of near-visible range by using the higher excited state oxygen O2 (b1Σ) which is generated through two O2 (1△) energy pooling, we de signed and studied a jet singlet oxygen generator with chlorine gas flow rate of 3-10 mmole/s. The O2(1△) concentratron, Cl, utilization rate and water content are measured using different injectors at different chlorine flow rate, cold trap temperature. We find that the optimum cold medium temperature is -140℃ to -150℃ when the trap is made of PVC. This result is explained by the competition between O2(1△) quenching and H2O freeze on wall of the trap. In optimum conditions, the water vapor pressure in the gas output can be reduced to as low as 4 Pa, which is reported for the first time.