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为了提高微量KBr压片红外光谱的灵敏度,普遍采用缩小锭片直径的方法,以便使微量样品尽可能多地落在经聚焦后的光束辐照范围内。因此,目前KBr锭片直径最小已达0.5厘米。这样势必导致光能量的过大损失,影响光谱质量。为了克服这一困难,我们改进了通用的均匀KBr压片方法,采用夹心式非均匀KBr压片技术,在KBr锭片直径为4毫米的条件下,把微克量级的样品集中在锭片中心约0.5×4毫米~2的区域内,使之与光源的成象截面的几何大小相匹配,这样,提高了光谱质量和灵敏度,获得了1—5微克样品的红外光谱。
In order to improve the sensitivity of infrared KBr microcomputers, it is common to reduce the diameter of the tablet to minimize the amount of trace sample falling within the focused beam. Therefore, the current KBr tablet diameter has reached a minimum of 0.5 cm. This will inevitably lead to excessive loss of light energy, affecting the quality of the spectrum. In order to overcome this difficulty we have improved the versatile uniform KBr tabletting method using a sandwich of non-uniform KBr tablet technology to concentrate microgram-sized samples in the center of the tablet at a KBr tablet diameter of 4 mm About 0.5 × 4 mm ~ 2 in the area, which is matched with the geometric size of the imaging section of the light source, thus improving the spectral quality and sensitivity and obtaining the infrared spectrum of 1-5 microgram samples.