Abstract:
Study of interaction of light with matter is a subject of molecular spectroscopy. Theories
developed by Maxwell, Young and other scientists in the nineteenth century established
that light could be thought as an electromagnetic wave propagating in a medium. Interaction
of such wave with molecules can provide rich information about their structure
as well as physical and chemical properties. The energy of a fixed molecule can be
divided into three parts: electronic, vibrational and rotational. Vibrational spectroscopy
probes the vibrational energy levels of a molecule. With the advent of modern optical
instrumentation, it has become an indispensable characterization technique in natural
science today. Infra-red (IR) and Raman are two main techniques in vibrational spectroscopy.
Although both techniques probe the vibrational energy level of a molecule,
physical mechanism involved in these processes is different as will be described later.
Of these two techniques, mainly Raman spectroscopy is employed in this work.
