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We present modified $\ell$-states of diatomic molecules by solving the radialand angle-dependent parts of the Schr\"odinger equation for central potentials,such as Morse and Kratzer, plus an exactly solvable angle-dependent potential$V_{\theta}(\theta)/r^2$ within the framework of the Nikiforov-Uvarov (NU)method. We emphasize that the contribution which comes from the solution of theSchr\"odinger equation for the angle-dependent potential modifies the usualangular momentum quantum number $\ell$. We calculate explicitly bound stateenergies of a number of neutral diatomic molecules composed of a first-rowtransition metal and main-group elements for both Morse and Kratzer potentialsplus an angle-dependent potential.

Modified l-states of diatomic molecules subject to central potentials plus an angle-dependent potential