K.J. Betsch [1,2], Nora G. Johnson[1,3], B. Bergues [1], M. Kubel [1], O. Herrwerth[1], A. Senftleben[4], I. Ben-Itzhak[3], G.G. Paulus[5,6], R. Moshammer[4], J. Ullrich[4,7], M.F. Kling [1,2], and R.R. Jones[2]
[1] Max-Planck-Institut für Quantenoptik, Garching 85748, Germany
[2] University of Virginia, Charlottesville, VA 22904, USA
[3] J.R. MacDonald Laboratory, Department of Physics, Kansas State University, Manhattan, KS 66506,USA
[4] Max-Planck-Institut für Kernphysik, Heidelberg, 69117, Germany
[5] Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, Jena, 07743, Germany
[6] Helmholtz Institut Jena, Max-Wien-Platz 1, 07743 Jena, Germany
[7] Physikalisch-Technische Bundesanstalt, Braunschweig 38116, Germany
Abstract:We explore the dissociative ionization and fragmentation of CO with carrier-envelope phase (CEP) tagged few-cycle laser pulses. We observe the CEP-dependence of the directional emission of C^p+ and O^q+ fragments from transient CO^(p+q)+ ions, where p+q <= 3 and q <= 1. At I_0 = 3.5×10^14 W/cm^2, a 180 degree phase difference between the C^+ and O^+ fragments from the (p=1,q=0) and (p=0,q=1) channels reflects the orientation-dependence of the CO ionization. At I_0 = 1.2 × 10^15 W'cm^2, we find a ~35 degree phase shift between the C^2+ fragments from the (p=2,q=0) and (p=2,q=1) channels, in contrast to the 180 degree shift previously observed between the C^2+ fragment channels at I_0 = 6 × 10^14 W/cm^2 (Y. Liu et al. Phys. Rev. Lett. 106, 073004 (2011)).
Status: Published Physical Review A 86, 063403 (2012).
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