已普遍用作原子吸收光谱分析光源的空心阴极灯,是一种特殊形式的辉光放电管。灯内充有压强为几乇的惰性气体氖。如果灯内气体中杂有氢、氧、氮等非惰性气体,由于它们的电离电位比氖低,在放电时较易生成正离子,这些正离子的溅射能量和激发其他原子的能量都比氖离子低,只要有少量存在就能使阴极元素的原子线发射减弱直至消失。杂质气体主要 Hollow cathode lamps, commonly used as sources of atomic absorption spectroscopy, are a special form of glow discharge tube. Lamp is filled with a few torr pressure of inert gas neon. If the lamp gas mixed with hydrogen, oxygen, nitrogen and other non-inert gases, because of their ionization potential is lower than neon, discharge is easier to generate positive ions, the positive ions sputtering energy and stimulate the other atoms than the energy than Low neon ions, as long as there is a small amount of the atomic element can make the emission of atomic lines weakened until disappear. Impurity gas main