Ionization and excitation of the excited hydrogen atom in strong circularly polarized laser fields
(2014) Physical review. A, Atomic, molecular, and optical physics — Vol. 90, n° 6 (2014)
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- In the recent work of Herath et al. [T. Herath, L. Yan, S. K. Lee, and W. Li, Phys. Rev. Lett. 109, 043004 (2012)PRLTAO0031-900710.1103/PhysRevLett.109.043004] the first experimental observation of a dependence of strong-field ionization rate on the sign of the magnetic quantum number m [of the initial bound state (n,l,m)] was reported. The experiment with nearly circularly polarized light could not distinguish which sign of m favors faster ionization. We perform ab initio calculations for the hydrogen atom initially in one of the four bound substates with the principal quantum number n=2, and irradiated by a short circularly polarized laser pulse of 800nm. In the intensity range of 1012-1013W/cm2 excited bound states play a very important role, but also up to some 1015W/cm2 they cannot be neglected in a full description of the laser-atom interaction. We explore the region that with increasing intensity switches from multiphoton to over-the-barrier ionization and we find, unlike in tunneling-type theories, that the ratio of ionization rates for electrons initially counter-rotating and corotating (with respect to the laser field) may be higher or lower than 1.
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Bauer, J. H., Warda, K., Piraux, B., O’Mahony, P. F., & Mota-Furtado, F. (2014). Ionization and excitation of the excited hydrogen atom in strong circularly polarized laser fields. Physical review. A, Atomic, molecular, and optical physics, 90(6). https://doi.org/10.1103/PhysRevA.90.063402 (Original work published 2014)