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The total and partial photodissociation cross sections of the molecular ion ${\text{HeH}}^{+}$ are computed by time-dependent methods for fragmentation into the excited shells $n=1,2,3$ up to a photon energy of 40 eV. ${^{1}\ensuremath{\Sigma}}^{+}$ and $^{1}\ensuremath{\Pi}$ states are considered for parallel and perpendicular transitions for different initial rotational or vibrational excitations. Nonadiabatic radial and rotational couplings are taken into account. The results from coupled-channel equations are compared with the Born-Oppenheimer approximation. A time-dependent calculation with a femtosecond laser pulse is carried out to simulate a recent crossed beam photodissociation imaging experiment with vacuum ultraviolet free-electron laser [H. B. Pedersen et al., Phys. Rev. Lett. 98, 223202 (2007)]. The dominance of photodissociation perpendicular to the photon polarization is confirmed.

physical review a

Photodissociation of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mtext>HeH</mml:mtext></mml:mrow><mml:mo>+</mml:mo></mml:msup></mml:mrow></mml:math>ion into excited fragments<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mi>n</mml:mi><mml:mo>=</mml:mo><mml:mn>2</mml:mn><mml:mo>,</mml:mo><mml:mn>3</mml:mn></mml:mrow><mml:mo>)</mml:mo></mml:mrow></mml:mrow></mml:math>by time-dependent methods

Photodissociation of theHeH+ion into excited fragments(n=2,3)by time-dependent methods