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Li, H.; Tong, X. M.; Schirmel, N.; Urbasch, G.; Betsch, K. J.; Zherebtsov, S.; Süßmann, F.; Kessel, A.; Trushin, S. A.; Paulus, G. G.; Weitzel, K.-M. and Kling, M. F. (2016): Intensity dependence of the dissociative ionization of DCl in few-cycle laser fields. In: Journal of Physics B-Atomic Molecular and Optical Physics, Vol. 49, No. 1, 15601

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We have studied the dissociative ionization of DCl in 4 fs laser fields at 720 nm central wavelength using intensities in the range (1.3-3.1) x 10(14) W cm(-2). By employing the phase-tagged velocity-map imaging technique, information about the angular distribution of deuterium ions as a function of their kinetic energy and the carrier-envelope phase is obtained. On the basis of the experimental data and semi-classical simulations, three regions are distinguished for the resulting D+ ions with different kinetic energies. The one with the lowest kinetic energy, around 5-7 eV, is from dissociation involving the X-state of DCl+, populated through direct ionization with the laser field. The second region, around 7-11 eV, originates from rescattering induced dissociative ionization. Above 2 x 10(14) W cm(-2) D+ ions with kinetic energies exceeding 15 eV are obtained, which we ascribe to double ionization induced by rescattered electrons.

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