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Coherent control of internal conversion (IC) between the first ($S_1$) andsecond ($S_2$) singlet excited electronic states in pyrazine, where the $S_2$state is populated from the ground singlet electronic state $S_0$ by weak fieldexcitation, is examined. Control is implemented by shaping the laser whichexcites $S_2$. Excitation and IC are considered simultaneously, using therecently introduced resonance-based control approach. Highly successful controlis achieved by optimizing both the amplitude and phase profiles of the laserspectrum. The dependence of control on the properties of resonances in $S_2$ isdemonstrated.

Coherent Quantum Control of $S_2 \leftrightarrow S_1$ Internal Conversion in Pyrazine via $S_0 \to S_2/S_1$ Weak Field Excitation