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We studied dependence of dissociative ionization in H2 on carrier-envelopephase (CEP) of few-cycle (6fs) near-infrared (NIR) laser pulses. For low-energychannels, we present the first experimental observation of CEP dependence fortotal dissociation yield and the highest dwgree of asymmetry reported to date(40%). The observed modulations in both asymmetry and total yield could beunderstood in terms of interference between different n-photon dissociationpathways - n and (n+1) photon channels for asymmetry, n and (n+2) photonchannels for yield - as suggested by the general theory of CEP effects (Roudnevand Esry, Phys. Rev. Lett. 99, 220406 (2007), [1]). The yield modulation isfound to be Pi-periodic in CEP, with its phase strongly dependent on fragmentkinetic energy (and reversing its sign within the studied energy range),indicating that the dissociation does not simply follow the CEP dependence ofmaximum electric field, as a naive intuition might suggest. We also find that apositively chirped pulse can lead to a higher dissociation probability than atransform limited pulse.

Carrier-Envelope-Phase Dependent Dissociation of Hydrogen