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We have studied the intrinsic disorder structure of a amorphous silicon surface layer formed by ultra high dose ion-implantation using Raman Spectroscopy and Ellipsometric Spectroscopy. The Raman spectrum shows that the blunt peak at about 480cm-1 becomes wider with the increase of dose while the peak 520cm-1 disappeared completely. We think after long range order has disappeared in the surface layer because of the high dose implantation, further higher dose implatation will cause the change of the short range order, which results mainly from the angle distortion of tetrahedral. With the increase of dose the angle distortion △θ, derived from the measurement of Raman HMW (half maximum width), is growing larger until it reaches the maximum △θmax. The shape of ε2(λ) spectrum and the optical energy gap have a close relationship with the angle distortion. The peak E2 at 4.25eV of the ε2(λ) spectrum disappeared whereas the peak E1 at 3.4eV related to bond direction of tetrahedral remain unchanged to some extent but becomes wider with the increase of dose just as the 480cm-1 Raman peak. A still higher dose of implantation will give rise to self-annealing phenomenon. Using the concept of "disorder saturation state", we have explained the experimental results successfully from the energy point of view. 相似文献
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建立了液萃取、气相色谱质谱(GC/MS)、全扫描(scan)定性、选择离子(SIM)监测标准曲线法定量分析水中硝基苯有机化合物的分析方法。通过实验得出回收率在80%-105%,RSD≤4%,方法检出限≤0.001mg/L。 相似文献
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生活充满情调的,时尚男女们在装饰完新家,给自己打造好安乐窝后发现,自己宽敞明亮、富有品位的客厅里,似乎还缺少了一些个性化的气息和元素。时尚有理,流行无罪,追求个性是时尚男女们的天职,在高清电视方兴未艾之时,高清投影机已经走进了他们的视野。[编者按] 相似文献
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针对在高寒地区修建隧道容易产生冻害的问题,通过对隔热层不同敷设方式的分析研究,以及离壁式保温衬套结构的室内试验,提出了高寒隧道隔热层防冻法的敷设结构形式,为高寒地区隧道施工提供了一种新的抗冻措施。 相似文献