Structural properties femtosecond time scale

Development of this kind of knowledge about excited states is likely to be slow, however moreover, the equipment is highly specialized and its use is more likely to be in the hands of spectroscopically oriented chemical physicists than in those of coordination chemists. For this reason, however, we can expect increasing collaboration between laboratories having different and complementary capabilities. There is another point to be made about laser spectroscopy. It is now possible to do state-to-state photochemistry on a long femtosecond time scale, that is, to pinpoint the vibrational level of the excited state and that of the immediately produced product state. At this point I believe that we have left the realm of chemistry and entered that of physics and spectroscopy for their own sake. What seems important to me, as a physical chemist, is to know the structure and electronic properties of thexi states rather than those of spectroscopic states. Notice that there are two distinct usages of the word "state" that of a thermodynamic state or ensemble, i.e. of a thexi state, and that of a particular molecular wave-mechanical or spectroscopic state. 

Beyond imaging, the combination of CRS microscopy with spectroscopic techniques has been used to obtain the full wealth of the chemical and the physical structure information of submicron-sized samples. In the frequency domain, multiplex CRS microspectroscopy allows the chemical identification of molecules on the basis of their characteristic Raman spectra and the extraction of their physical properties, e.g., their thermodynamic state. In the time domain, time-resolved CRS microscopy allows the recording of the localized Raman free induction decay occurring on the femtosecond and picosecond time scales. CRS correlation spectroscopy can probe three-dimensional diffusion dynamics with chemical selectivity. 

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