@article{MAKHILLRJAS202116510300, title = {Series Solutions of Mathematical Problems of Quantum Mechanics}, journal = {Research Journal of Applied Sciences}, volume = {16}, number = {5}, pages = {204-211}, year = {2021}, issn = {1815-932x}, doi = {rjasci.2021.204.211}, url = {https://makhillpublications.co/view-article.php?issn=1815-932x&doi=rjasci.2021.204.211}, author = {JP.C.,B.I.,J.O. and}, keywords = {Quantum mechanics,eigenvalues,eigenvectors,harmonic oscillator,operators}, abstract = {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.} }