【求助】火焰原子发射法与火焰原子吸收法有什么不同?

一个是发射光谱，一个是吸收光谱。

哈哈 正解

详细点可以吗?

我手里正好有点从PE AA400说明书中摘录的直接发给你：
Emission vs. Absorption

All modern Perkin-Elmer atomic absorption instruments are capable of
measuring both atomic absorption and atomic emission. It is important
for the operator to understand the processes that occur in each echnique.
Every element has a specific number of electrons associated with its
nucleus. The normal and most stable orbital configuration of an atom is
known as the "ground state." If energy is applied to an atom, the energy
will be absorbed and an outer electron will be promoted to a less stable
configuration known as the "excited state." Since this state is unstable,
the atom will immediately return to the "ground state," releasing light
energy.



Atomic Emission

In atomic emission, the processes of excitation and decay shown in
Figure 1 are both involved.
Figure 1. Excitation and Decay



The sample is subjected to a high-energy thermal environment in order
to produce excited-state atoms. This environment can be provided by a
flame or, more recently, a plasma. However, since the excited state is
unstable, the atoms spontaneously return to the "ground state" and emit
light. The emission spectrum of an element consists of a collection of
emission wavelengths called emission lines because of the discrete nature of the emitted wavelengths. The intensity at an emission line will increase as the number of excited atoms of the element increases.

Atomic Absorption
The process of atomic absorption is illustrated in Figure 2.




The "ground state" atom absorbs light energy of a specific wavelength
as it enters the "excited state." As the number of atoms in the light path
increases, the amount of light absorbed also increases. By measuring
the amount of light absorbed, a quantitative determination of the
amount of analyte can be made. The use of special light sources and
careful selection of wavelengths allow the specific determination of
individual elements.


Atomic Emission vs. Atomic Absorption


There are some basic differences between atomic emission and atomic
absorption. Using atomic emission, the flame serves a dual purpose: it
converts the sample aerosol into an atomic vapor and then thermally
elevates the atoms to an excited state. When these atoms return to the
ground state, they emit light which is detected by the instrument. The
intensity of light emitted is related to the concentration of the element
of interest in solution.
In atomic absorption, the only function of the flame is to convert the
sample aerosol into atomic vapor which can then absorb light from the
primary light source (hollow cathode lamp or electrodeless discharge
lamp).
Emission vs. Absorption

All modern Perkin-Elmer atomic absorption instruments are capable of
measuring both atomic absorption and atomic emission. It is important
for the operator to understand the processes that occur in each echnique.
Every element has a specific number of electrons associated with its
nucleus. The normal and most stable orbital configuration of an atom is
known as the "ground state." If energy is applied to an atom, the energy
will be absorbed and an outer electron will be promoted to a less stable
configuration known as the "excited state." Since this state is unstable,
the atom will immediately return to the "ground state," releasing light
energy.



Atomic Emission

In atomic emission, the processes of excitation and decay shown in
Figure 1 are both involved.
Figure 1. Excitation and Decay



The sample is subjected to a high-energy thermal environment in order
to produce excited-state atoms. This environment can be provided by a
flame or, more recently, a plasma. However, since the excited state is
unstable, the atoms spontaneously return to the "ground state" and emit
light. The emission spectrum of an element consists of a collection of
emission wavelengths called emission lines because of the discrete nature of the emitted wavelengths. The intensity at an emission line will increase as the number of excited atoms of the element increases.

Atomic Absorption
The process of atomic absorption is illustrated in Figure 2.




The "ground state" atom absorbs light energy of a specific wavelength
as it enters the "excited state." As the number of atoms in the light path
increases, the amount of light absorbed also increases. By measuring
the amount of light absorbed, a quantitative determination of the
amount of analyte can be made. The use of special light sources and
careful selection of wavelengths allow the specific determination of
individual elements.


Atomic Emission vs. Atomic Absorption


There are some basic differences between atomic emission and atomic
absorption. Using atomic emission, the flame serves a dual purpose: it
converts the sample aerosol into an atomic vapor and then thermally
elevates the atoms to an excited state. When these atoms return to the
ground state, they emit light which is detected by the instrument. The
intensity of light emitted is related to the concentration of the element
of interest in solution.
In atomic absorption, the only function of the flame is to convert the
sample aerosol into atomic vapor which can then absorb light from the
primary light source (hollow cathode lamp or electrodeless discharge
lamp).

楼上真是热心，全是打出来的，没用扫描，结果图却不能提供。
版主应该给楼上加分，为了他乐于助人的精神！
他还是今天注册的新用户。