掺CH4 Ar基体中粒子的延迟爆发及自由基-自由基相互作用
Delayed burst of particles from Ar matrices doped with CH4 and radical-radical interaction
摘要：
用发射光谱方法研究了在1%~ 10%浓度范围内，电子辐照激发下，颗粒从掺甲烷的Ar基体中的延迟爆炸脱附。对含CH_4的Ar基体阴极射线发光（CL）谱的记录表明，辐射诱导甲烷转化的产物为H、CH和C。用不同的辐照和加热模式进行了三个系列的实验：（i）在低温下连续辐照，积累辐解产物，（ii）加热预辐照膜，测量弛豫发射，特别是热激外逸电子发射（TSEE），和（iii）在束下外部加热预辐照膜。这些对选定波长下所谓的非稳态发光（NsL）和非稳态脱附（NsD）的测量与TSEE登记相结合，提供了有关感兴趣的带电和中性物质反应的信息。考虑到CH自由基可以被认为是CH 3物质的特征[27]，我们获得了关于H原子和CH 3自由基在刺激颗粒从掺杂甲烷的Ar基质中爆炸性延迟解吸中的作用的信息。在低温下，所有甲烷掺杂的Ar基质在静态辐照过程中，都出现了两个长周期自振荡和有限周期的短周期自振荡。讨论了导致粒子产额自振荡的过程。
英文摘要：
The delayed explosive desorption of particles from Ar matrices doped with methane stimulated by an electron irradiation was studied in the extended concentration range from 1% to 10% using emission spectroscopy methods. Registration of the cathodoluminescence (CL) spectra of CH4-containig Ar matrices revealed following products of radiation-induced methane transformation: H, CH and C. Three series of experiments were performed with different irradiation and heating modes: (i) continuous irradiation at low temperature with accumulation of radiolysis products, (ii) heating of the pre-irradiated films with measurements of relaxation emissions, specifically thermally stimulated exoelectron emission (TSEE) and (iii) external heating of the pre-irradiated films under beam. These measurments of the, so called, nonstationary luminescenve (NsL) at the selected wavelenghs and nonstationary desorption (NsD) in combination with TSEE registration provided an information on reactions of charged and neutral species of interest. Taking into account that the CH radical can be considered as a signature of the CH3 species [27] we obtained the information on a role of H atoms and CH3 radicals in stimulation of explosive delayed desorption of particles from Ar matrices doped with methane. Two bursts of long-period self-oscillations together with short-period ones with a limited number of periods were observeed during stationary irradiation of all methane-doped Ar matrices at low temperatures. Processes leading to the self-oscillations of particle yield are discussed.
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