The Hamiltonian with a linear potential, represented as z x, leads to Airy function solutions when considering a particle in a 1-D infinite potential well, resulting in numerical eigenvalues. This behavior is confirmed by simulations, such as those conducted with Mathematica, that illustrate the effects of a stationary electric field on an electron in confinement. In cases where the potential well has finite walls, obtaining a numerical solution becomes significantly more complex. The derivation of these concepts can be found in David Miller's Quantum book. Understanding the spectrum of such Hamiltonians is crucial for quantum mechanics applications.