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1.
利用微波放电Cl2/He等离子体作为Cl源,对反应NCl(a1Δ) + I(2P3/2)→NCl(X3Σ) + I(2P1/2)进行了实验研究,得到了较大的I(2P1/2)自发辐射荧光信号,检测到NCl(a1Δ,b1Σ)自发辐射荧光光谱在存在少量I(2P1/2)下发生的显著变化,其中NCl(a1Δ)自发辐射荧光信号降低,同时由于I(2P1/2)的作用,NCl(b1Σ)自发辐射荧光信号大幅度增加。在考察各反应气体流量对I(2P1/2)自发辐射荧光信号的影响时发现,在本次实验条件下,各种气体的最佳流量:He为1~4mmol/s, I2为0.01~0.03mmol/s, Cl2为1.0mmol/s左右,而HN3流量略大于Cl2流量时信号升高幅度开始变缓,约为Cl2流量的两倍时信号不再有显著的变化。 相似文献
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对利用微波放电直接解离Cl2生成Cl, Cl与HN3反应生成NCl(a1Δ )和NCl(b1∑)的过程进行了实验研究。得到了较强的NCl(a1Δ 和NCl(b1∑)自发辐射光谱,考察了Cl2流量和He/Cl2配比对NCl(a1Δ 和NCl(b1∑)生成的影响。发现对于一定的He流量,Cl2流量对NCl(a1Δ 和NCl(b1∑)生成的影响存在一最佳范围,而最佳He/Cl2配比不是一定值,而是随He流量升高而变大,在实验所考察的He流量范围(5~40 L/min)内,最佳He/Cl
2配比在30∶1~100∶1之间。 相似文献
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通过考察各种放电状态及气流条件下发生器内外物种的自发辐射谱,发现光谱峰值强度与对应物种浓度成正比。分析了主要的等离子体动力学过程,了解了单重态氧及其它物种的浓度变化规律。考察了α放电和γ放电两种不同的放电方式。发现在α放电状态下,体系中有较少氧原子等淬灭性粒子,更有利于O2(1Δ)产生。加入He,有效地降低了气体体系的离子化阈能和约化场强,约化场强最小时,产生的O2(1Δ)浓度最大,相较于纯氧放电,O2(1Δ)浓度提高一倍以上。考察了腔外各物种浓度的变化,O2(1Δ)离开放电腔后浓度稳定,沿距离减少较慢,有益于出光。优化了本系统的放电极间距,极间距太大或太小,都不利于单重态氧的产生。 相似文献
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介绍了一种新的产生单重态氧(O2(1△g)的气固化学反应体系,即在固定床式反应器中采用固体过氧化钠粉末与氯气(Na2O2/Cl2)进行反应的气固化学反应体系。实验分别通过用对近红外敏感的光谱仪和锗探头监测了反应产生的(O2(1△g)的发射光谱和1 270 nm的光信号,同时通过数据采集系统监测了反应池固体反应层和测试池中气体的温度的变化曲线。实验测得了(O2(1△g)在1 270 nm附近的特征发射光谱,此光谱表明该体系是一个很好的产生(O2(1△g)的体系,同时,实验现象表明该反应是强放热反应。 相似文献
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The development of Chemical Oxygen-Iodine Lasers is based on the generation of singlet delta oxygen. To improve the overall efficiency of these lasers, it is necessary to increase the generator production and yield of singlet delta oxygen at low and high pressure, respectively, for subsonic and supersonic lasers. Furthermore, the water vapor content must be as low as possible. A generator model, based on gas-liquid reaction and liquid-vapor equilibrium theories associated with thermophysical evaluations is presented. From model predictions, operating conditions have been drawn to attain the following experimental results in a bubble-column: by increasing the superficial gas velocity, the production of singlet delta oxygen is largely improved at low pressure; by mixing chlorine with an inert gas before injection in the reactor, this yield is maintained constant up to higher pressure. A theoretical analysis of these experimental results and their consequences for both subsonic and supersonic lasers are presented.This work was performed with the support of the Direction des Recherches, Etudes et Techniques. 相似文献
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对氧碘化学激光器的单重态氧发生器(SOG)进行了改进,采用横向射流方式,并对该横向射流式单重态氧发生器的性能进行了检测。实验中过氧化氢碱溶液温度控制在-16℃左右,氯气流量为530mmol/s,He与氯气的流量比为3;采用PS法测量单重态氧分子的产率,吸收法测量氯气的利用率和相对水含量。得出如下结论:在不使用冷阱和分离器的情况下,最高单重态氧分子产率达到58%, 氯气利用率在80%以上,相对水含量小于等于0.5;气体达到最大流量时,发生器仍然能稳定地工作。 相似文献
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V. Jirásek J. Schmiedberger M. ?ensky J. Kodymová 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2012,66(4):89
The dissociation of molecular iodine in 40 MHz-RF discharge was studied experimentally. This generation of atomic iodine is
aimed at use in oxygen-iodine lasers. The discharge was ignited in a mixture of I2 + buffer gas fast-flowing through the cylindrical chamber and the discharge products were injected into a supersonic flow
of nitrogen. The atomic iodine number density was measured in a low-pressure cavity after mixing with nitrogen and the dissociation
fraction was calculated related to the input I2 flow rate. The dissociation fraction of 46.2% was achieved at 0.22 mmol/s of I2 and 7 mmol/s of Ar and RF power of 500 W. Argon and helium were used as a buffer gas; discharge stability and dissociation
efficiency were better with argon. At the I2 flow rate corresponding to the operation of a 1 kW chemical oxygen-iodine laser, the dissociation fraction was about 20%.
The dissociation efficiency (the fraction of absorbed energy used for the dissociation) significantly decreased with increasing
in the specific energy. At a reasonable I2 flow rate (0.32 mmol/s), the maximum achieved efficiency was 8.5% and the corresponding energy cost was 8.9 eV per dissociating
of one I2 molecule. The input energy of more than 3 kJ per 1 mmol of I2 is needed for dissociating at least 50% of I2. The obtained dependencies on the gas flow rates infer a good chance for scaling-up of the tested RF discharge generator
for the intended application. 相似文献
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大气压氩直流微放电光谱研究 总被引:1,自引:1,他引:0
微空心阴极放电或微放电是一种能够实现高气压下放电的有效方法。利用不锈钢空心针作阴极,不锈钢网作阳极,进行了大气压氩直流微放电实验研究。测量了大气压氩微放电光谱,发现氩气的发 射谱线主要集中在690~860 nm范围,且全部为氩原子4p—4s的跃迁。实验研究了不同放电电流、气体压强、气体流量与谱线强度之间的关系,发现谱线强度随放电电流、气体流量增加均增加,而谱线强 度随压强变化呈现不同特征:谱线强度随压强的增加先增加后降低,在13.3 kPa时强度最大。此外,选用跃迁波长为763.51和772.42 nm的两条光谱线,利用发射谱线强度比值法测量了氩气微放电等离子 体的电子激发温度。结果显示,其电子激发温度处于2 000~2 800 K之间,且随放电电流的增加而增加,随气体压强和气体流量的增加而降低。 相似文献
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We present the results of theoretical and experimental studies demonstrating the possibility of developing an oxygen-iodine laser (OIL) with direct optical pumping of molecular oxygen involving inter-molecular interaction with charge transfer from donor molecule (buffer gas) to acceptor molecule (oxygen). This interaction lifts degeneracy of the lower energy states of molecular oxygen and increases its absorption cross section in the visible spectral region and the UV Herzberg band, where high quantum yield of singlet oxygen is achieved (QY ~ 1 and QY ~ 2, respectively) at the same time. A pulse-periodic optical pump sources with pulse energy of ~50 kJ, pulse duration of ~25 μs, and repetition rate of ~10 Hz, which are synchronized with the mechanism of singlet oxygen generation, are developed. This allows implementation of a pulse-periodic oxygen-iodine laser with an efficiency of ~25%, optical efficiency of ~40%, and parameter L/T ~ 1/1.5, where T is the thermal energy released in the laser active medium upon generation of energy L. It is demonstrated that, under direct solar pumping of molecular oxygen, the efficiency parameter of the OIL can reach L/T ~ 1/0.8 in a wide range of scaling factors. 相似文献
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通过采用Cl2流量250mmol/s列管射流式氧发生器的COIL出光实验,得到了激光输出功率随碘副气流相对于氧主气流混合穿透深度的变化规律。实验结果表明,穿透深度对激光功率影响较大,存在最佳穿透深度,约为3.16mm,计算的最佳穿透深度与实验得到的最佳穿透深度基本一致。通过逐步改变供碘系统的碘气流流量,测量激光的输出功率,在实验上证实并找到了COIL的最佳碘流量值,约为4.5mmol/s,这一结果比以往文献所登载的最佳碘流量值要确切。 相似文献
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A new regime of chemical oxygen-iodine laser (COIL), high-pressure subsonic mode operation, was demonstrated using a jet-type
singlet oxygen generator (SOG). The laser output power of 342 W with chemical efficiency of 20.9% was obtained at the Cl2 flow rate of 18 mmol/s and the operating pressure of 6.4 Torr in the laser cavity. The specific energy was 3.1 J/l which
was four times higher than our supersonic device, and was comparable to the highest value for the supersonic regime. The experimental
results were in good agreement with the numerical simulation results.
Received: 26 February 1999 / Revised version: 13 July 1999 / Published online: 30 November 1999 相似文献
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R. K. Tyagi R. Rajesh Gaurav Singhal Mainuddin A. L. Dawar M. Endo 《Optics & Laser Technology》2003,35(5):395-399
Supersonic Chemical Oxy-iodine Laser has been developed using a Singlet Oxygen Generator (SOG) with a novel approach. Generated singlet oxygen is taken out of the SOG at an angle of 40° to avoid the problem of carry over of droplets, which is one of the major drawbacks of horizontal system. The system has been operated up to 22 mmol/s chlorine flow rates. Chlorine utilization and singlet oxygen observed have been more than 90% and 60%, respectively. The observed maximum output power was 350 W, thus yielding a chemical efficiency of 17.5%. 相似文献