Comment on: Uncommonly accurate energies for the general quartic oscillator, Int. J. Quantum Chem., e26554 (2020), by P.Okun and K.Burke

Abstract

It is shown that for the one-dimensional quantum quartic anharmonic oscillator the numerical results obtained by Okun-Burke in Ref.2 are easily reproduced and can be significantly improved in Lagrange Mesh Method (based on non-uniform lattice).

arXiv comment8 pages, 3 Tables; several footnotes added, typos corrected, Ref.7 updated, Acknowledgements added

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• Anharmonic oscillator: a solution
• Solving the One-Dimensional Time-Independent Schrödinger Equation with High Accuracy: The LagrangeMesh Mathematica Package
• Power-like potentials: from the Bohr-Sommerfeld energies to exact ones
• Highly accurate potential energy curves for the hydrogen molecule ion
• Study of the Quartic Anharmonic Oscillator Using the System's Wave Function Expansion in the Oscillator Basis
• From quartic anharmonic oscillator to double well potential