Influence of weak electric fields on Rydberg electron wavepacket dynamics in the radial coordinate

The spin–orbit autoionisation dynamics of Rydberg electron wavepackets in Ar are investigated in weak electric fields, where ε≤−13.8 and ε is the scaled energy in atomic units. The electric field modifies both the interference pattern and revival time of the recurrence spectrum. By writing the energies of the eigenstates included in the superposition as a Taylorʹs expansion, a quantitative description of the changes in classical orbit period and revival time are obtained.