Infrared spectroscopy is extremely versatile with regards to the physical state and type of sample, and possible ways of sample preparation

The relative intensity of the characteristic peak of a funcitonal group is independent of how many bonds of that type are present

For routine spectrospy analysis only the mid-IR range is used

The presence of a few individual peaks can be enough to identify one substance

The vubration of bons must result in a change in dipole moment for an absorption peak to appear in the IR region

For the positive identification of a substance with IR, the pattern of several peaks has to match with those of a reference spectrum

The number of photons that undergo Raman scattering is very small ( 1 in 10^7)

Other spectroscopies require a polychromatic source, since all the wavelengths in the desired range must be present

The number of photons that are emitted after Raman excitation is very small

Laser have very specific wavelengths, narrower than the bandwidth achievable with a monochromator

The absorption cross-section is very small because the bonds have to be polarizable for the raman signal

The possibility of using two different excitation wavelengths presents advantage

Identify some inorganic compounds

Make routine measurements of the elemental composition of a sample

determine what functional goups are present in an organic molecule

Obtein exactly the same information as FTIR for any organic molecule

Identify organic compouns or biomolecules in aqueous solitions

Analyze samples inside opaque containers

UV photon absorption can result in dissociation of some molecules

UV lasers are more expensive

UV wavelengths can produce fluorescence

The wavelength of a UV laser is too far from the range of infrared wavelength that correspond to the observed Raman shifts

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