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为扣除溶剂或其他背景组分的干扰,测量红外光谱时常常需要获得期望强度的高质量背景单光束谱。通常,实验上获得期望强度的背景谱是极其困难的。为实现这一重要且十分困难的目标,引进了杂化单光束谱的概念。同一溶液但不同厚度的b1和b2的两样品的单光束谱分别为b1和b2,则定义它们的线性组合α=αb1+(1-α)b2为杂化单光束谱,其中α(0≤α≤1)称为组分因子。调整组分因子α数值,就可以精确调控杂化谱的强度。在合适的条件下,杂化谱α与厚度为b2-αb2+αb1的真实样品的光谱高度类似,即b2-αb2+αb1≈α。因此,不用制备厚度为b2-αb2+αb1的样品,其单光束谱可以用α来替代。随着α变化,可以得到不同的α,厚度在b1和b2间的真实样品的单光束谱都可用相应的α来替代。实验结果证实,杂化谱提供了一种简单和易操作的扣除背景干扰的高效方法。
To account for the interference of solvents or other background components, it is often necessary to obtain a high quality background single beam spectrum of the desired intensity when measuring the infrared spectrum. In general, it is extremely difficult to experimentally obtain a background spectrum of the desired intensity. To achieve this important and very difficult goal, the concept of hybrid single beam spectroscopy has been introduced. The single beam spectra of b1 and b2 with the same solution but different thicknesses are respectively b1 and b2, and their linear combinations α = αb1 + (1-α) b2 are hybrid single-beam spectra, Where α (0≤α≤1) is called a component factor. Adjust component factor α values, you can accurately control the hybrid spectrum intensity. Under suitable conditions, the spectrum α is highly similar to the spectrum of a real sample of thickness b2-αb2 + αb1, ie b2-αb2 + αb1≈α. Therefore, instead of preparing a sample of thickness b2-αb2 + αb1, the single beam spectrum can be replaced by α. As α changes, different α can be obtained, and the single beam spectrum of a real sample with thickness b1 and b2 can be replaced by the corresponding α. The experimental results confirm that the hybrid spectrum provides an easy and easy way to deduct background interference.