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- W2034140163 abstract "We have investigated the branching ratios and angular distributions of photofragments resulting from the two-frequency multiphoton dissociation of ${mathrm{HD}}^{+}$ from initial bound level ${v}_{i}{=0,J}_{i}=0$ induced by linearly polarized parallel laser fields of equal intensity of $1{mathrm{T}mathrm{W}/mathrm{c}mathrm{m}}^{2}.$ Both the laser frequencies ${ensuremath{omega}}_{1}$ and ${ensuremath{omega}}_{2}$ are below the dissociation threshold with ${ensuremath{omega}}_{1}<{ensuremath{omega}}_{2}.$ We have used the time-independent close-coupling method. Molecular rotation has been taken into account with $J=0--9$ in each of the two electronic states GS and ES. The photon absorption channels ${(n}_{1}{,n}_{2})$ with ${n}_{1}{,n}_{2}=0--3$ have been included when ${n}_{1}$ and ${n}_{2}$ are the numbers of photons of frequencies ${ensuremath{omega}}_{1}$ and ${ensuremath{omega}}_{2}$ absorbed. We have neglected absorption channels when (net) four or more photons are involved. This necessitates the use of 120 channels. All radiative couplings including those due to the intrinsic dipole moments of ${mathrm{HD}}^{+}$ have been considered in a truncated length gauge form of interaction. In the presence of intermediate photon vibrational resonance with the GS (1,0) channel, dissociation takes place mainly through the ES (1,1) channel. But the channel ES (1,2) dominates for frequency ${ensuremath{omega}}_{2}$ not satisfying the resonance condition. For linear polarization, preferential photofragment ejection along the field polarization direction (i.e., $ensuremath{theta}=0ifmmode^circelsetextdegreefi{}$ or $180ifmmode^circelsetextdegreefi{})$ takes place. On resonance, the angular distribution shows prominent rings that are peaks on the photofragment distribution away from $ensuremath{theta}=0ifmmode^circelsetextdegreefi{}.$ We have presented the photofragment angular distributions of ${mathrm{HD}}^{+}$ for different (open) photon channels within the framework of dressed state picture, vibrational trapping and the bond softening, adiabatic path, and the nonadiabatic transition mechanisms." @default.
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- W2034140163 date "2003-07-02" @default.
- W2034140163 modified "2023-09-23" @default.
- W2034140163 title "Branching and angular distribution of photofragments in two-frequency intense-field multiphoton dissociation ofHD+" @default.
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- W2034140163 doi "https://doi.org/10.1103/physreva.68.013401" @default.
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