H. Li,
X. M. Tong,
N. Schirmel,
G. Urbasch,
K. J. Betsch,
S. Zherebtsov,
F. Süssmann,
A. Kessel,
S. A. Trushin,
G.G. Paulus,
K.-M. Weitzel,
and M. F. Kling
Intensity dependence of the dissociative ionization of DCl in few-cycle laser fields
J. Phys. B, 49 :015601 (November 2016)
Intensity dependence of the dissociative ionization of DCl in few-cycle laser fields
J. Phys. B, 49 :015601 (November 2016)
Abstract:
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) × 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 × 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.