The photodissociation cross section of the molecular ion HeH + was calculated within the Born–Oppenheimer approximation for a parallel, a perpendicular and an isotropic orientation of the molecular axis with respect to the field, considering also different initial vibrational and rotational states. The results were compared to recent data from a free-electron laser experiment performed at the FLASH facility by Pedersen et al (2007 Phys. Rev. Lett. 98 223202). Within the experimental uncertainties theoretical and experimental results are compatible with each other.
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Dumitriu et al. (2009) studied this question.
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