“…12 The technique has been generalized to various kinds of spectroscopies and has been applied to the study of intramolecular interaction, rheo-optical study of polymers, molecular dynamic of liquid crystals in electric fields, reaction kinetics, etc. [13][14][15][16][17][18][19] The generalized approach consists of a spectroscopic probe on the system under study while some kind of perturbation occurs. The perturbation of the system can be of different natures, such as mechanical, electrical, thermal, chemical, etc.…”