Spectroscopic Technique for Estimating Dissociation Energies of Diatomic Molecules

The dissociation energy of a diatomic molecule is the energy required to break the bond between its two atoms in the ground state. Spectroscopic techniques can be used to estimate the dissociation energies of diatomic molecules. The correct option for the spectroscopic technique used is "IR" or Infrared spectroscopy.

Infrared Spectroscopy

Infrared spectroscopy involves the absorption of infrared radiation by a molecule. The molecule absorbs specific frequencies of infrared radiation that correspond to the vibrational frequencies of the bonds between its atoms. The absorption of infrared radiation results in the excitation of the molecule to a higher vibrational energy level.

Estimation of Dissociation Energy

The dissociation energy of a diatomic molecule can be estimated by analyzing the IR spectra of the molecule. The dissociation energy is related to the vibrational frequency of the bond between the two atoms in the molecule. As the bond becomes weaker, the vibrational frequency decreases.

The dissociation energy can be estimated using the following equation:

D0 = hνe + De

where D0 is the dissociation energy, h is Planck's constant, νe is the vibrational frequency of the bond in the molecule, and De is the vibrational energy of the molecule in its dissociated state.

By analyzing the IR spectra of a diatomic molecule, the vibrational frequency of the bond can be determined. This vibrational frequency can be used in the above equation to estimate the dissociation energy of the molecule.

Conclusion

Infrared spectroscopy is a powerful analytical technique that can be used to estimate the dissociation energies of diatomic molecules. The vibrational frequency of the bond between the two atoms in the molecule can be determined from the IR spectra, which can be used to estimate the dissociation energy of the molecule.