Betsch, K. J.Johnson, Nora G.Bergues, B.Kübel, M.Herrwerth, O.Senftleben, A.Ben-Itzhak, I.Paulus, G. G.Moshammer, R.Ullrich, J.Kling, M. F.Jones, R. R.2023-12-072023-12-072012-12-05https://hdl.handle.net/2097/43884We explore the dissociative ionization of CO with carrier-envelope-phase (CEP) tagged few-cycle laser pulses. We observe the CEP dependence of the directional emission of Cp+ and Oq+ fragments from transient CO(p+q)+ ions, where p+q≤3 and q≤1. At I0=3.5×1014 W/cm2, a 180∘ 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 I0=1.2×1015 W/cm2, we find a ∼35∘ phase shift between the C2+ fragments from the (p=2, q=0) and (p=2,q=1) channels, in contrast to the 180∘ shift previously observed between the C2+ fragment channels at I0=6×1014 W/cm2 [Phys. Rev. Lett. 106, 073004 (2011)].© American Physical Society (APS). This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).http://rightsstatements.org/vocab/InC/1.0/https://web.archive.org/web/20181120135245/https://journals.aps.org/copyrightFAQ.htmlText