Sandor, NagyPham, Hong Nam2025-06-172025-06-172025-05-12https://hdl.handle.net/2437/393039In this work, we apply Rayleigh-Schrodinger perturbation theory to calculate the spectral function of a quantum particle characterized by an anharmonic oscillator and coupled to a heat bath built by a system of coupled quantized harmonic oscillators20enquantum mechanicPhysicsHozzáférhető a 2022 decemberi felsőoktatási törvénymódosítás értelmében.