• Motiur Rahman Ansari

In this paper, the absorption and dispersion of light have been explained using the hypothesis that the molecules of ponderable bodies contain small bodies that are set in vibration by the periodic forces existing in a beam of light or radiant heat. In the Quantum theory, however, the actual mechanism of the dynamical system does not come into the picture except its transition frequencies. Hence the theory is of quite general application to resonant systems. In the first part, we deal with the problem classically and make a transition to the quantum theory by replacing the strength of the oscillator with the quantum mechanical expression for it. In the second part, we shall deal with quantum mechanical theory and point out the significant differences between the two theories and also have derived an expression in another formula like Van Vleck-Weisskopf formulae and so on.

: Polyatomic molecule, Quantum mechanical theory.

"POLYATOMIC MOLECULE IN GASEOUS ASSEMBLY WITH VIEW TO QUANTUM MECHANICAL WAY ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.3, Issue 2, page no.79-83, February-2016, Available :http://www.jetir.org/papers/JETIR1701712.pdf

"POLYATOMIC MOLECULE IN GASEOUS ASSEMBLY WITH VIEW TO QUANTUM MECHANICAL WAY ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.3, Issue 2, page no. pp79-83, February-2016, Available at : http://www.jetir.org/papers/JETIR1701712.pdf