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Comparison of the main characteristics, strengths, and drawbacks of the different techniques. Note that one- or two-photon processes probe vibrational excitations with different symmetries. In this respect, Raman spectroscopy is complementary to IAS and THz-TDS.
| Technique | Optical Process | Vibrational Mode | Real-Time Capability | Harmful | Water Absorption |
|---|---|---|---|---|---|
| Raman | two-photon | single-bond | YES | YES | LOW |
| IAS | one-photon | single-bond | YES | LOW | MEDIUM |
| THz-TDS | one-photon | Collective | YES | NO | STRONG |
