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Carrier envelope phase (CEP) stabilized pulses of intense 800 nm light of 5fs duration are used to probe the dissociation dynamics of dications ofisotopically-substituted water, HOD. HOD$^{2+}$ dissociates into either H$^+$ +OD$^+$ or D$^+$ + OH$^+$. The branching ratio for these two channels isCEP-dependent; the OD$^+$/OH$^+$ ratio (relative to that measured withCEP-unstabilized pulses) varies from 150% to over 300% at different CEP values,opening prospects of isotope-dependent control over molecular bond breakage.The kinetic energy released as HOD$^{2+}$ Coulomb explodes is alsoCEP-dependent. Formidable theoretical challenges are identified for properinsights into the overall dynamics which involve non-adiabatic field ionizationfrom HOD to HOD$^+$ and, thence, to HOD$^{2+}$ via electron rescattering.

Bond-selective fragmentation of water molecules with intense, ultrafast, carrier envelope phase stabilized laser pulses