TY - JOUR T1 - Series Solutions of Mathematical Problems of Quantum Mechanics AU - Mbagwu, JP.C. AU - Madububa, B.I. AU - Ozuomba, J.O. AU - Udoye, M.C. JO - Research Journal of Applied Sciences VL - 16 IS - 5 SP - 204 EP - 211 PY - 2021 DA - 2001/08/19 SN - 1815-932x DO - rjasci.2021.204.211 UR - https://makhillpublications.co/view-article.php?doi=rjasci.2021.204.211 KW - Quantum mechanics KW -eigenvalues KW -eigenvectors KW -harmonic oscillator KW -operators AB - Quantum mechanics has played a major role in photonics, quantum electronics, and microelectronics. A series method is a powerful tool for solving quantum mechanical problems. In this study, we obtained the approximate solutions of operators using Harmonic Oscillator in a linear combination of the energy eigenstates. Also, the commutator of monomials of operators obeying constant commutation relations is expressed in terms of anti-commutators. We obtained the angular momentum operators in an eigenfunction with the use of matrices. Finally, we determined some exact solutions of eigenvalues and eigenvectors in a matrix representation of the operator to some set of orthonormal basis vectors. ER -