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Introduction to Spectroscopy

  • Dr. Suresh S Patil
  • Professor and Head
  • Dept. of Chemistry
  • Padmabhushan Dr Vasanttraodada Patil Mahavidyalaya Tasgaon Dist Sangli.

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University Syllabus

  • Meaning of spectroscopy.
  • Nature of electromagnetic radiation:

Wavelength, frequency, energy, amplitude, wave number and

their relationship.

  • Different units of measurement of wavelength and frequency.
  • Different regions of electromagnetic radiations.
  • Interaction of radiation with matter: absorption, emission, fluorescence and scattering.
  • Types of spectroscopy and advantages of spectroscopic methods.
  • Energy types and energy levels of atoms and molecules.

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Nature of Electromagnetic Radiations

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Wavelength

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Amplitude (a)

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Frequency(√)

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Wave Number

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Energy (E)

E = hν

where h = Plank’s constant

ν = frequency

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Relations Between �Energy, Wavelength, and Frequency

E = hν

where h = Plank’s constant

ν = frequency

We know, c = νλ, ie ν = c/λ

Therefore, E= h c/λ

If h and c are constant E = 1/λ

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Different Regions of �Electromagnetic Radiations

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Visible Region

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Schematic Diagram of� Molecular Excitations

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Nature of Spectrum