 Hello and welcome to this course of CD spectroscopy and MOSBUS spectroscopy for chemist. My name is Arnabdutta and I am an associate professor in the department of chemistry IIT Bombay. Over here when you look into the nature we find that symmetry is one essential element and when you look into the symmetry we found that one of the other aspect comes out very carefully and that is chirality. This chirality is very important to the nature. If you look into all the natural ingredients like carbohydrate, protein or nucleic acid all of them are chiral and over here chirality becomes one of the important molecular recognition factor by which they detect the conditions, chemicals and even the products. So their functionality very much dependent on chirality. So that is why we want to know how the chiral molecules behave. Additionally, when you look into the different drug molecules we found that drug molecules are also chiral in nature in most of the times and if we use one enantiomer than the other one can be very much good medicine other can be the evil twin, a toxin. So that is why we want to know very well what is the absolute structure of each of the enantiomer of the drug molecule we are using and that is why CD spectroscopy or circular dichroism spectroscopy come into the picture. Circular dichroism spectroscopy give us a very good molecular picture of the chirality of a molecule. In this particular course we are going to look into the fundamental and applications of CD spectroscopy. In the second segment we are going to look into Mossberg spectroscopy. Circular spectroscopy can be performed only a handful of nuclei and among them iron is one of them. If we look into the iron it is one of the most essential element present in the earth which is playing a huge role in biology. They are the active site of multiple metalloenzymes additionally they have also found application in industrial scale. So that is why knowing the functionality of iron is very much important to us and for that we need to know what is the oxidation state of the iron, what is the coordination geometry, what is the spin state and Mossberg spectroscopy is one of the spectroscopy which give you all the information at one place. Mossberg spectroscopy is a very unique spectroscopy where we change the nuclear spin state and over here we will learn the fundamental of Mossberg spectroscopy in addition to the various applications of it. So we hope that you will surely enjoy this particular course on CD spectroscopy and Mossberg spectroscopy. Now we look forward to welcome you all for this particular course. Thank you.