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In this paper, we have calculated the vibrational frequencies of medium-size molecule (5-100 atoms), Tetrachloroethylene (C2Cl4) in fundamental mode by one dimensional unitary Lie algebraic technique. In this method, bonds C-Cl and C-C of the Tetrachloroethylene are replaced with a unitary Lie algebras and Hamiltonian expressed in terms of Casimir and Majorana invariant operators and parameters. This Hamiltonian operator describes stretching vibrations of molecule. The determined vibrational frequencies by this theoretical method are compared with experimental results. The obtained results are consistent with experimental results. keywords: Vibrational spectra, Lie algebraic technique, Tetrachloroethylene.

Vibrational Spectra of C2Cl4 Using Lie Algebraic Technique