We study how weak broadband noise affects 30.36 GHz 10%-"ionization" thresholds F(10%) (that produce "ionization" probability P ion = 10%) of rto = 54, . . . ,72 H atoms. Calculations confirm that increased noise lowers F(10%) for most «o's, raises some, but affects others little. We show noise to be a useful spectroscopic tool for uncovering novel quantal phenomena such as scarred states, which we link semiclassically to approximately adiabatic evolution near the separatrix of a nonlinear resonance island. Our results apply generally to the quantal behavior of classical mixed phase space systems.
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