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Many modulation techniques have been widely applied to improve the quality of conventional spectra. Here a pressure-modulated EXAFS method is proposed to detect the small changes of local structure induced by the modulation of high pressure. In the experiment a dynamic diamond anvil cell was used to put a periodic load on the sample and lock-in amplifier to measure the modulated EXAFS signals. We have applied this technique to ZnSe and revealed a sensitivity to atomic displacement of 0.1 pm that is about ten times better than that of traditional EXAFS. 相似文献
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在微生物检测和食品安全控制中需要对低浓度的三磷酸腺苷(ATP)做出快速准确的测定,基于ATP光学反应原理,设计了一种微量光学反应池,结合萤火虫素-萤火虫素酶发光技术,构建了一种用于现场检测的高灵敏度ATP光学传感器系统.传感器响应波长为550 nm,ATP生物发光反应适宜pH为7.8,在优化实验条件下,发光强度和ATP浓度在对数坐标下呈线性相关,检出限可达1×10-16 mol/L ATP,检测样品仅需30 μL,测量时间60 s.这种检测方法具有响应范围宽,测试简便,快速可靠等特点,适用于ATP现场快速检测,具有很好的应用前景. 相似文献
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