In an RLC circuit ω0 is the resonant frequency, ωd is the natural frequency and α the neper frequency. The neper frequency for parallel and series circuits are given by
1
α = 1/2RL and α = R/2LC respectively
2
α = LC/2R and α = 2L/RC respectively
3
α = 1/2RL and α = L/RC respectively
4
α = 1/2RC and α = R/2L respectively