Rydberg electron binding energy spectra of CHD. (a) Projection of the nonbackground-subtracted spectrum onto the binding energy coordinate at pump-probe delays of more than 800 fs before the time zero. (b) Projection of the nonbackground-subtracted spectrum onto the binding energy coordinate at pump-probe delays over 13.6 ps after the time zero. (c) Difference photoelectron spectra. The spectra used to obtain the difference spectrum were slightly smoothed and are normalized to the maximum peak intensity.