IR spectroscopy PPT | PDF For Free Download: IR spectroscopy or infrared spectroscopy is also called as vibrational spectroscopy. It implicates an interaction of infrared radiation with matter. Absorption spectroscopy techniques are covered in it and are used to recognize chemicals and study chemicals. An infrared spectrometer is a tool with which the infrared spectroscopy can be done, an infrared spectrometer is also called as a spectrophotometer and is availed to generate an infrared spectrum.

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IR spectroscopy PPT | PDF For Free Download

The infrared spectrum is fundamentally a graph which has thefrequency on a horizontal axis or else wavelength on the horizontal axis and infrared light absorbance on vertical axis. Reciprocal centimeters or wave numbers are the units of frequency availed in IR spectra. The microns or micrometers are units used to represent IR wavelength. A usual equipment of laboratory which avails this method is a Fourier transform infrared spectrometer and also called as FTIR spectrometer. The diagrammatic representation of IR spectrometer is as below:

Block diagram of FTIR spect

In the electromagnetic spectrum, the portion of infrared is divided into the below regions and they are as follows:

  • Near-infrared region
  • Mid-infrared region
  • Far-infrared region

They are named so because of their relation with visible spectrum. The classifications of all these regions are based on the properties of electromagnetic or relative molecular.

  1. Near-infrared region: The near-infrared region has the frequency of 3.8 * 10^14 – 1.2 * 10^14 Hz, wave numbers of 12800 – 4000 cm^-1 and wavelength of 0.8 – 2.5 µm. It can excite harmonic vibrations and overtone vibrations.
  2. Mid-infrared region: The mid-infrared region has the frequency of 3.8 * 10^14 – 1.2 * 10^14 Hz, wave numbers of 4000 – 200 cm^-1 and wavelength of 2.5 – 50 µm and are availed for studying the structure of associated rotational vibration and also the fundamental vibrations.
  3. Far-infrared region: The region of far-infrared has the frequency of 3.8 * 10^14 – 1.2 * 10^14 Hz, wave numbers of 200 – 10 cm^-1 and wavelength of 50-100µm and are availed for rotational spectroscopy.
  4. Most used region: This region has the frequency of 3.8 * 10^14 – 1.2 * 10^14 Hz, wave numbers of 4000 – 670 cm^-1 and wavelength of 2.5 – 15 µm.

Among many spectroscopic techniques, IR spectroscopy is a widely availed method because the groups which absorb in IR region engross within a particular region of wavelength. The peaks of absorption in an ultraviolet region and visible region are less sharp when compared with the absorption peaks of this region.

Distinct functional groups absorb distinct IR radiation frequency and because of this, determining the functional groups becomes very sensitive in infrared spectroscopy. In the organic compounds and in inorganic compounds, IR spectroscopy plays a vital role in identifying distinct substances and also in the structure analysis of the substances. It is also availed in the mixtures of similar compounds which are complex for the qualitative analysis and also for the quantitative analysis.

Theory of IR spectroscopy:

Infrared spectroscopy takes an unfair advantage of the truth that molecules suck up frequencies and this nature of absorbing is a characteristic of the molecule’s structure. This taking up of the frequencies happens at a resonant frequency, a resonant frequency is a frequency where vibrational frequency matches absorbed radiation.

Infrared energy modes:

Infrared active modes are the stretching vibrational modes, bending vibrational modes and these motions produce the absorptions. The occurrence of asymmetric stretching vibrations is high at the higher frequencies than the occurrence of symmetric stretching vibrations. Similarly, at high frequencies stretching vibrations occur than the bending vibrations.

Influence factors of IR:

The influence factors of IR are as follows:

  • Isotope effects
  • Solvent effects

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Advantages of IR:

The advantages of IR as below:

  • High scan speed
  • High resolution
  • High sensitivity
  • Wide range of applications
  • Large amount of information
  • Non-destructive

Disadvantages of IR:

The disadvantages of IR are as below:

  • Sample constraint
  • Spectrum complication
  • Quantification

Content of the PPT and PDF for IR spectroscopy

  • What is Infrared Spectroscopy?
  • IR Spectroscopic Process
  • Uses and Application
  • Advantages
  • Disadvantages
  • Conclusion
  • Reference

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