Resonance of hydrogen and lithium atoms in parallel magnetic and electric fields

We apply the complex absorbing potential method to study the resonances of the ground state of hydrogen atom and the low-lying 2S and 2P (m = 0) states of lithium atoms in parallel magnetic and electric fields. The behavior of resonance parameters for the ground state of hydrogen atoms in parallel magnetic and electric fields are consistent with those obtained by other methods. We then discuss the extension of the present method to study the resonant low-lying states of lithium atoms.