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本文报导在高纯Hg蒸气石英放电管中首次观测到峰值位于226.2nm左右属于Hg2准分子GO^+u→XO^+g束缚→自由跃迁的漫射带辐射,实验测量了漫射带强度随放电电流、气体温度和密度的变化关系,获得漫射带最大信号输出的工作参量。 相似文献
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用Ar~+激光器514.5nm激光线激发NaK分子,在590—710nm范围获得d~3∏→a~3∑~+跃迁三重态荧光谱。实验结果表明:D~1∏态与d~3∏态间相互微扰以及D~1∏态到d~3∏态的碰撞诱导转移是引起d~3∏→a~3∑~+跃迁增强的最主要原因。 相似文献
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激光诱导荧光检测技术 总被引:4,自引:1,他引:3
激光诱导荧光(LIE)检测作为目前灵敏度最高的检测技术之一,在生物、化学、医学等领域应用广泛,其本身的技术发展也十分迅速.综述了近年来LIF检测系统、荧光探针、荧光分析技术和应用领域的进展,重点介绍了LIF激光光源、光纤光路LIF系统、多通道LIF系统以及LIF成像的最新进展和应用前景. 相似文献
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本文测量了紫外激光(308nm)激发诱导正常组织和胃癌组织315nm-600nm波段的自体荧光,发现胃癌组织在此荧光光谱不同于正常组织的荧光光谱。根据两者4的区别,可以把胃癌组织从正常组织中区分出来,这为诊断胃癌提供了一个新的思路。 相似文献
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From the recent experimentally observed conduction band offset and previously reported band gaps,one may deduce that the valence band offset between rutile SnO2 and TiO2 is around 1 eV,with TiO2 having a higher valence band maximum.This implication sharply contradicts the fact that the two compounds have the same rutile structure and the Γ3^+ VBM state is mostly an oxygen p state with a small amount of cation d character,thus one would expect that SnO2 and TiO2 should have small valence band offset.If the valence band offset between SnO2 and TiO2 is indeed small,one may question the correctness of the previously reported band gaps of SnO2 and TiO2.In this paper,using first-principles calculations with different levels of computational methods and functionals within the density functional theory,we reinvestigate the long-standing band gap problem for SnO2.Our analysis suggests that the fundamental band gap of SnO2 should be similar to that of TiO2,i.e.,around 3.0 eV.This value is significantly smaller than the previously reported value of about 3.6 eV,which can be attributed as the optical band gap of this material.Similar to what has been found in In2O3,the discrepancy between the fundamental and optical gaps of SnO2 can be ascribed to the inversion symmetry of its crystal structure and the resultant dipole-forbidden transitions between its band edges.Our results are consistent with most of the optical and electrical measurements of the band gaps and band offset between SnO2 and TiO2,thus provide new understanding of the band structure and optical properties of SnO2.Experimental tests of our predictions are called for. 相似文献
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应用激光诱发荧光诊断不同物质导致的白鼠肝纤维化 总被引:1,自引:0,他引:1
本文应用激光诱导荧光的方法,对不同物质诱发白鼠的肝纤维化的肝组织进行了荧光光谱分析,发现经过注射不同物质的白鼠的肝组织与正常白鼠的肝组织的荧光光谱有明显不同,这一结果对于研究肝纤维化的起因和对肝纤维化进行早期诊断有重要参考价值。 相似文献
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通过分析52Cr原子光刻对激光系统的技术要求,详细介绍了一种基于原子束激光感生荧光(LIF)光 谱技术的稳频方法。 相似文献
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Tugba Selcen Navruz Muzeyyen Saritas 《Progress in Photovoltaics: Research and Applications》2014,22(5):593-602
In this study, the optimum material parameters capable of providing high efficiencies close to the detailed balance limit are determined for intermediate band solar cells. A diffusion model, including the overlap effect between absorption coefficients, is used during the calculations for the first time. It is obtained that to achieve high efficiencies close to the detailed balance limit; the effective density of state value, NCV, should be higher than 1017 cm−3 and the carrier mobility should be larger than 200 cm2/Vs, where the light concentration should not be higher than nearly 1000 sun. Besides, it is found out that the optimum intermediate band level and the base width depend on the mobility and effective density of state values. So they need to be optimized according to the material parameters. The effect of overlap between absorption coefficients on the performance of intermediate band solar cells is also investigated. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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