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Atomic Spectroscopy Poster

Atomic spectroscopy involves the study of electromagnetic radiation absorbed or emitted by atoms. When an electron absorbs energy and transitions to an excited state, it will emit a photon of characteristic energy as it falls back to the ground state. Atomic absorption spectroscopy uses a hollow cathode lamp that emits radiation of a specific metal, and analyzes how much of that radiation is absorbed by solutions of unknown samples and standards of known concentration to determine the concentration of the metal in the sample.

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Mustafa Rezaie
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544 views1 page

Atomic Spectroscopy Poster

Atomic spectroscopy involves the study of electromagnetic radiation absorbed or emitted by atoms. When an electron absorbs energy and transitions to an excited state, it will emit a photon of characteristic energy as it falls back to the ground state. Atomic absorption spectroscopy uses a hollow cathode lamp that emits radiation of a specific metal, and analyzes how much of that radiation is absorbed by solutions of unknown samples and standards of known concentration to determine the concentration of the metal in the sample.

Uploaded by

Mustafa Rezaie
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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ATOMIC SPECTROSCOPY

The study of electromagnetic radiation absorbed or emitted by atoms

Atomic
absorption/emission Preparation and analysis
If an electron absorbs a discrete amount of A cathode lamp made from the metal to be
energy, it can transition to a higher energy level analysed is selected. The lamp emits light of a
(excited state). wavelength characteristic of that metal.
The atom is unstable in this state, so the A set of standard solutions of the metal ion
electron moves back from the excited to the are prepared, as well as a 'blank' of distilled
ground state (in 1 transition or multiple), water.
emitting energy in the form of photon/s. The spectrometer is used to detect
The energy of each emitted photon is equal to absorbance of these solutions (of known
the difference between energy levels the concentration) and a calibration graph is
electron has transitioned between. Because constructed.
the energy levels of atoms of each element are The sample of interest is then analysed using
unique, so too is the energy (and wavelength) AAS to detect absorbance of the metal. The
of the photon emitted. calibration graph can then be used to
determine the concentration of the metal.

Spectrometer components
Hollow cathode lamp:
Made from metal to be analysed,
emits radiation characteristic of
that metal

Atomiser:
Flame that vapourises and
atomises the metal ions in the
sample. In this state they can
absorb radiation.

Monochromator: Detector:
The transmitted radiation (that Detects the amount of radiation absorbed (by comparison of
which is not absorbed) is passed radiation emerging from atomiser and the initial radiation
through the monochromator. The from lamp).
monochromator isolates the
wavelengths of interest. The higher the concentration, the greater the absorbance.

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