About the book
Scattering of light by molecules can be elastic, Rayleigh scattering, or inelastic, Raman scattering. In the elastic scattering, the photon’s energy, and the state of the molecule after the scattering events are unchanged. Hence, Rayleigh scattered light does not contain much information on the structure of molecular states. In inelastic scattering, the frequency of monochromatic light changes upon interaction with the vibrational states, or modes, of a molecule. The effect was postulated theoretically by Smekal et al. in 1923 but was ﬁrst discovered experimentally by C.V. Raman in 1928 in an experiment using the sun as a light source.
Raman spectroscopy is a powerful tool and has been around for more than 80 years. With the advancement in the laser sources, better and compact spectrometers, detectors and optics have broadened the field of its application. Raman spectroscopy found its application in various fields like chemistry, medicine, material science, forensics, astronomy, nanotechnology, and biology. With the discovery of surface-enhanced Raman scattering in 1973 by Martin Fleischmann, the interest of the research community in Raman spectroscopy as an analytical method has been reinvigorated. Various special Raman techniques such as surface-enhanced Raman spectroscopy (SERS), tip-enhanced Raman spectroscopy (TERS), surface-enhanced resonance Raman spectroscopy (SERRS) and non-linear Raman spectroscopy have been developed and continuously studied.
There are many books on the introduction and applications of Raman scattering in the past, but the subject itself is so fast-paced and continuously developing that one must remain updated about the latest development in the field. This book aims to familiarize the reader to basics of Raman scattering phenomenon, Raman spectroscopy instrumentation as well as to introduce the latest development in the special techniques in Raman spectroscopy and its applications in various fields.