火焰发射光谱和原子吸收光谱之间的差异

Thekey differencebetween flame emission spectroscopy and atomic absorption spectroscopy is thatduring flame emission spectroscopy, certainwavelengthsare emitted from atoms, whereas during atomic absorption spectroscopy, certain wavelengths are absorbed by atoms.

An electromagnetic wave consists of electric andmagnetic fieldsoscillating perpendicular to each other. Thus, the full range of electromagnetic radiation wavelengths is what we call the electromagnetic spectrum. In spectroscopy experiments, we use电磁辐射特定波长以分析样品。原子吸收光谱和发射光谱是两种光谱化学方法，可用于使用光态的光辐射或光原子的光辐射或光原子的光辐射或光原子的定量测定。

内容

1.Overview and Key Difference
2.什么是火焰发射光谱
3.原子吸收光谱法是什么
4.并排比较 - 火焰发射光谱与原子吸收光谱以表格形式
5.概括

什么是火焰发射光谱？

Flame emission spectroscopy is a spectro-analytical procedure useful in determining the chemical elements in a sample quantitatively. This is also namedatomic emission spectroscopybecause it depends on the emission of electromagnetic ration from atoms. This technique is named as such because it uses a flame as the light source.

Atoms can be excited to a higher energy level if the required amount of energy is provided externally. The lifetime of an excited state is generally short. Therefore, these excited species have to release the absorbed energy and come back to the ground state. We call this relaxation.

The release of energy may take place as electromagnetic radiation, heat or as both types. The plot of released energy versus wavelength gives an emission spectrum. Moreover, each element has a unique emission spectrum as they have a unique absorption spectrum. Therefore, we can characterize radiation from a source by emission. Line spectra occur when the radiating species are individual atomic particles that are well separated in a gas.

原子吸收光谱法是什么?

原子吸收光谱是一种用于定量样品中化学元件的光谱分析方法。该过程取决于游离金属离子的光吸收。

Electrons are in certain energy levels of an atom. We call these energy levels atomic orbitals. These energy levels are quantized rather than being continuous. The electrons in the atomic orbitals can move from one energy level to another by either absorbing or releasing the energy they have. However, the energy the electron absorbs or emits should be equal to the energy difference between the two energy levels (between which the electron is going to move).

Since each and every chemical element has a unique number of electrons at its ground state, an atom will absorb or release energy in a pattern unique to its elemental identity. Therefore, they will absorb/emit photons in a correspondingly unique pattern. Then we can determine the elemental composition of a sample by measuring the changes in light wavelength and light intensity.

光线通过原子样品后，如果我们记录下来，我们可以称其为原子谱。它显示了一种原子的特征。因此，我们可以将其用于识别或确认特定物种的身份。这种频谱将具有许多非常狭窄的吸收系。

What is the Difference Between Flame Emission Spectroscopy and Atomic Absorption Spectroscopy?

Flame emission spectroscopy and atomic absorption spectroscopy are spectro-analytical procedures useful in determining the chemical elements in a sample quantitatively. The key difference between flame emission spectroscopy and atomic absorption spectroscopy is that during flame emission spectroscopy, certain wavelengths are emitted from atoms, whereas during atomic absorption spectroscopy, certain wavelengths are absorbed by atoms.

Below is a summary of the difference between flame emission spectroscopy and atomic absorption spectroscopy in tabular form.

摘要 - 火焰发射光谱与原子吸收光谱

Flame emission spectroscopy and atomic absorption spectroscopy are spectro-analytical procedures useful in determining the chemical elements in a sample quantitatively. The key difference between flame emission spectroscopy and atomic absorption spectroscopy is that during flame emission spectroscopy, certain wavelengths are emitted from atoms, whereas during atomic absorption spectroscopy, certain wavelengths are absorbed by atoms.

Reference:

1. “FLAME EMISSION SPECTROSCOPY.”幻灯片,Available here.

Image Courtesy:

1. “ICPAES PerkinElmer 2” By Superchilum – Own work(CC BY-SA 3.0)viaCommons Wikimedia
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