McKenna, J.Sayler, A. M.Gaire, B.Kling, Nora G.Esry, Brett D.Carnes, K. D.Ben-Itzhak, Itzik2013-01-162013-01-162013-01-16http://hdl.handle.net/2097/15211We reveal surprisingly high kinetic energy release in the intense-field fragmentation of D[subscript 3][superscript +] to D[superscript +] + D[superscript +] + D with 10[superscript 16]Wcm[superscript −2], 790 nm, 40 fs (and 7 fs) laser pulses. This feature strongly mimics the behaviour of the D[superscript +] + D[superscript +] + D[superscript +] channel. From the experimental evidence, we conclude that the origin of the feature is due to frustrated tunnelling ionization, the first observation of this mechanism in a polyatomic system. Furthermore, we unravel evidence of frustrated tunnelling ionization in dissociation, both two-body breakup to D + D[subscript 2][superscript +] and D[superscript +] + D[subscript 2], and three-body breakup to D[superscript +] + D + D.en-USAttribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0)D[subscript 3][superscript +]Frustrated tunnelling ionizationD3+Article (publisher version)