原子发射光谱仪，是根据处于激发态的待测元素原子回到基态时发射的特征谱线对待测元素进行分析的方法。在正常状态下，原子处于基态，原子在受到热（火焰）或电（电火花）激发时，由基态跃迁到激发态，返回到基态时，发射出特征光谱（线状光谱）。原子发射光谱法包括了三个主要的过程，即：

Atomic emission spectrometry is a method for the analysis of the characteristic spectrum of the emission from the excited state of the atom to be detected in the ground state. Under normal state, the atom is in the ground state, when the atom is excited by the heat (flame) or electric (electric spark), the ground state transitions to the excited state, and returns to the ground state. Atomic emission spectrometry includes three main processes, namely:

1、由光源提供能量使样品蒸发、形成气态原子、并进一步使气态原子激发而产生光辐射；

1, by the light source to provide energy to the evaporation of the sample, the formation of gaseous atoms, and further make the gas atomic excitation and produce light radiation;

2、将光源发出的复合光经单色器分解成按波长顺序排列的谱线，形成光谱；

2, the composite light issued from the monochromator wavelength according to the decomposition order, form a spectrum;

3、用检测器检测光谱中谱线的波长和强度。

3. The wavelength and intensity of the spectral line in the spectrum are detected by the detector.

由于待测元素原子的能级结构不同，因此发射谱线的特征不同，据此可对样品进行定性分析；而根据待测元素原子的浓度不同，因此发射强度不同，可实现元素的定量测定。

The measured energy structure of atoms, so the emission spectra of the different lines, it can carry on the qualitative analysis of samples; and according to the measured concentration of atoms, so the emission intensity is different, can realize the quantitative determination of elements.

原子发射光谱是指由于物质内部运动的原子和分子受到外界能量后发生变化而得到的。

The atomic emission spectrum is obtained by the change of the atomic and molecular energy of the internal motion of the material.