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原子發射光譜儀，是根據處于激發態的待測元素原子回到基態時發射的特征譜線對待測元素進行分析的方法。在正常狀態下，原子處于基態，原子在受到熱（火焰）或電（電火花）激發時，由基態躍遷到激發態，返回到基態時，發射出特征光譜（線狀光譜）。原子發射光譜法包括了三個主要的過程，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、由光源提供能量使樣品蒸發、形成氣態原子、并進一步使氣態原子激發而產生光輻射；

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、將光源發出的復合光經單色器分解成按波長順序排列的譜線，形成光譜；

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

3、用檢測器檢測光譜中譜線的波長和強度。

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

由于待測元素原子的能級結構不同，因此發射譜線的特征不同，據此可對樣品進行定性分析；而根據待測元素原子的濃度不同，因此發射強度不同，可實現元素的定量測定。

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.

原子發射光譜是指由于物質內部運動的原子和分子受到外界能量后發生變化而得到的。

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