The Role of Mass in the Carrier-Envelope Phase Effect for $\rm H_2^+$ Dissociation

The field-aligned model in the Born-Oppenheimer representation is adopted to study carrier-envelope phase (CEP) effects in the dissociation of $\rm H_2^+$ and its isotope $\rm D_2^+$ in an intense laser field. We find that $\rm D_2^+$ shows larger CEP effects under the same laser conditions. Specifically, the CEP effects appear as differences in each dissociation channel $\rm{p+H}$ and $\rm{H+p}$, i.e. p going up or down, respectively, relative to the laser polarization direction.We will present results for a range of laser intensities, and we will also present an interpretation based on the recently developed theory in Ref. [1]. [1] V.Roudnev and B.D.Esry, Phys. Rev. Lett. 99, 220406 (2007)