气体分子对某些波长和波段的红外光能有选择的吸收,将吸收的光能转变为分子的振动动能和转动动能,使分子从较低的能级跃迁至较高的能级.气体的这种性质表现在2～25μm中红外区吸收光谱图上.图1为红外光谱仪上实测的CO 4.65μm、CO_2 4.26μm两个特征谱 Gas molecules are selectively absorbed by certain wavelengths and wavelengths of infrared light, converting the absorbed light energy into molecular vibrational kinetic energy and rotational kinetic energy, allowing the molecule to transition from a lower energy level to a higher energy level. This property is reflected in the 2 ~ 25μm mid-infrared absorption spectrum.Figure 1 for the infrared spectroscopy measured CO 4.65μm, CO_2 4.26μm two characteristic spectrum