A new Raman technique of superior spectral resolution

Raman-active vibrational modes are coherently excited by the
transient stimulated Raman process. A subsequent delayed probe of
relatively long duration interacts with the freely relaxing
vibrations. Raman spectra are generated with higher resolution and
more accurate peak positions than in conventional Raman
spectroscopy. In liquid cyclohexane four new Raman lines were
readily detected in the frequency range 2870–2920 cm−1.