Question

What is the significance of selection rule in spectroscopy?

Answer 1

Rotational spectroscopy is concerned with the measurement of the energies of transitions between quantized rotational states of molecules in the gas phase. The spectra of polar molecules can be measured in absorption or emission by microwave spectroscopy or by far infrared spectroscopy. The rotational spectra of non-polar molecules cannot be observed by those methods, but can be observed and measured by Raman spectroscopy. Rotational spectroscopy is sometimes referred to as pure rotational spectroscopy to distinguish it from rotational-vibrational spectroscopy where changes in rotational energy occur together with changes in vibrational energy, and also from ro-vibronic spectroscopy where rotational, vibrational and electronic energy changes occur simultaneously

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Answer 2

Spectroscopy

The dispersion of light into component colours is referred to as spectroscopy. Simply put, it determines how much light is absorbed by a chemical substance and how much light passes through it at what intensity.

According to analytical science, each element or compound has a distinct characteristic spectrum. Each compound absorbs and disperses light at different wavelengths.

Application of Spectroscopy

• Spectroscopy is primarily used to investigate the structure of molecules and atoms. Spectroscopy will examine atoms' and molecules' structure and electron configurations using a long wavelength.
• Spectroscopy can also determine the chemical composition of unknown materials. The emission spectrum of spectroscopy will aid in focusing on a few parts per million of a trace element in a cloth.
• The study of spectral emission lines will aid astronomers in studying distant galaxies, which will assist in analysing the universe in all directions. Astronomers will also observe the Doppler shift of spectral lines. A Doppler shift occurs when the radiation source, such as a star or nebula, moves relative to an observer.

Significance of selection rule in Spectroscopy.

Rotational spectroscopy measures the energies of transitions between quantised rotational states of molecules in the gas phase. Microwave or far-infrared spectroscopy can measure the spectra of polar molecules in absorption or emission. The rotational spectra of non-polar molecules cannot be observed or measured using those methods, but Raman spectroscopy can. Rotational spectroscopy is sometimes referred to as pure rotational spectroscopy to distinguish it from rotational-vibrational spectroscopy, in which changes in rotational energy coincide with changes in vibrational energy, and also from ro-vibronic spectroscopy, in which changes in rotational, vibrational, and electronic energy coincide.

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