1 Attoclock elicits physics of laser-induced tunnel ionization Adrian N. Pfeiffer 1* , Claudio Cirelli 1 , Mathias Smolarski 1 , Darko Dimitrovski 2$ , Mahmoud Abu-samha 2 , Lars Bojer Madsen 2 , Ursula Keller 1 1 Physics Department, ETH Zurich, 8093 Zurich, Switzerland 2 Lundbeck Foundation Theoretical Center for Quantum System Research, Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark * Email: apfeiff@phys.ethz.ch; Telephone: +41 44 6332172; Fax: +41 44 633 1059 $ Email: darkod@phys.au.dk; Telephone: +45 89423668; Fax: +45 8612 0740