Control over the Dissociation of Highly Excited Oxygen in Attosecond XUV Pump- IR Probe experiments

We present results on the phase and amplitude control over the photodissociation yield of O$_{\mathrm{2}}^{\mathrm{+}}$ in a pump-probe experiment. Using an attosecond pulse train, we create excited state wavepackets along both the B and c state pathways of O$_{\mathrm{2}}^{\mathrm{+}}$. We use a two-IR pulse probe to steer the wavepacket. By tuning the excitation spectrum and phase between the two IR pulses, we find we can modulate the dissociated O$^{\mathrm{+}}$ yield with the frequency of IR intensity modulation and control the phase difference between the two dissociation pathways.