Introduction to Absorption line spectra
Absorption line spectra is a spectroscopic technique which measures the absorption of radiation as a function of frequency or wavelength. The sample absorbs energy in the form of photons from the radiating field. The intensity of the absorption spectra varies as a function of frequency. This spectroscopic technique is employed as an analytical tool for the determination of presence of a particular substance in a sample and, in many cases, to quantify the amount of the substance present. Looking out for more help on Chemical Name of Aspirin in chemistry by visiting listed websites.
Basic theory of absorption line spectra
By the nature of quantum mechanical change induced in the molecule absorption lines are classified. When rotational state of a molecule is changed then rotational lines occur which are found in microwave spectral region. When vibrational state of a molecule is changed then vibrational lines occur which are found in infrared region. When electronic state of a molecule is changed then electronic lines occur which are found in visible and ultra violet region.
Relation between absorption line spectra Emission spectra and continuous spectrum
In the emission spectra, substance releases energy in the form of electromagnetic radiation. Emission can occur at any given frequency at which absorption can occur, and this allows the absorption lines to be determined from an emission spectrum. The absorption spectral lines can be calculated from the emission spectrum using appropriate theoretical models and additional information about the quantum mechanical states of the system.
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Applications of absorption line spectra
Analytical chemistry:
Because of its specificity and quantitative nature absorption line spectra is useful in chemical analysis.
Ex: Absorption line spectra is used to identify the presence of pollutants in the air, distinguishing the pollutant from the nitrogen, oxygen, water and the other expected constituents.
Remote sensing:
The source of radiation in remote measurements is often an environmental source, such as sunlight or the thermal radiation from a warm object, and this makes it necessary to distinguish spectral absorption from changes in the source spectrum.
Astronomy:
In this case, astronomical spectra contain both absorption and emission spectral information. The objects and samples of interest are so distant from earth that electromagnetic radiation is the only means available to measure them. Absorption spectral lines are particularly important for understanding interstellar clouds and it is also employed in the study of extrasolar planets.
Absorption line spectra is a spectroscopic technique which measures the absorption of radiation as a function of frequency or wavelength. The sample absorbs energy in the form of photons from the radiating field. The intensity of the absorption spectra varies as a function of frequency. This spectroscopic technique is employed as an analytical tool for the determination of presence of a particular substance in a sample and, in many cases, to quantify the amount of the substance present. Looking out for more help on Chemical Name of Aspirin in chemistry by visiting listed websites.
Basic theory of absorption line spectra
By the nature of quantum mechanical change induced in the molecule absorption lines are classified. When rotational state of a molecule is changed then rotational lines occur which are found in microwave spectral region. When vibrational state of a molecule is changed then vibrational lines occur which are found in infrared region. When electronic state of a molecule is changed then electronic lines occur which are found in visible and ultra violet region.
Relation between absorption line spectra Emission spectra and continuous spectrum
In the emission spectra, substance releases energy in the form of electromagnetic radiation. Emission can occur at any given frequency at which absorption can occur, and this allows the absorption lines to be determined from an emission spectrum. The absorption spectral lines can be calculated from the emission spectrum using appropriate theoretical models and additional information about the quantum mechanical states of the system.
Is this topic Radioactive Decay Equation hard for you? Watch out for my coming posts.
Applications of absorption line spectra
Analytical chemistry:
Because of its specificity and quantitative nature absorption line spectra is useful in chemical analysis.
Ex: Absorption line spectra is used to identify the presence of pollutants in the air, distinguishing the pollutant from the nitrogen, oxygen, water and the other expected constituents.
Remote sensing:
The source of radiation in remote measurements is often an environmental source, such as sunlight or the thermal radiation from a warm object, and this makes it necessary to distinguish spectral absorption from changes in the source spectrum.
Astronomy:
In this case, astronomical spectra contain both absorption and emission spectral information. The objects and samples of interest are so distant from earth that electromagnetic radiation is the only means available to measure them. Absorption spectral lines are particularly important for understanding interstellar clouds and it is also employed in the study of extrasolar planets.
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