A Review on the Quantum Mechanical Calculation of Rotational Constants for Interstellar Organic Molecules

Abstract

Interstellar medium consists of gas and dust, even no part of galaxy is completely empty and interstellar dust is most crucial constituent of our Galaxy. ISM has extremely low density, 90% of it contains gas mainly atomic or molecular hydrogen, 9% is helium, and the remaining 1% consists of heavier elements. The spectroscopic observations both in absorption and emission in ISM, along with laboratory studies of sample materials, have increased interest in the study of organic molecules in ISM. Dust grains in ISM absorb and emit energy in the microwave and far-IR part of the spectrum. Here we are presenting the comparison between computed and observed rotational constant for interstellar organic molecules like CN, CO, HCN, OCS and so many other identified interstellar molecules.