Non-adiabatic Strong Field Ionization of Atomic Hydrogen

Abstract

We present experimental data on the non-adiabatic strong field ionization of atomic hydrogen using elliptically polarized femtosecond laser pulses at a central wavelength of 390 nm. Our measured results are in very good agreement with a numerical solution of the time-dependent Schrödinger equation (TDSE). Experiment and TDSE show four above-threshold ionization (ATI) peaks in the electron's energy spectrum. The most probable emission angle (also known as 'attoclock-offset angle' or 'streaking angle') is found to increase with energy, a trend that is opposite to standard predictions based on Coulomb interaction with the ion. We show that this increase of deflection-angle can be explained by a model that includes non-adiabatic corrections of the initial momentum distribution at the tunnel exit and non-adiabatic corrections of the tunnel exit position itself.

8 pages, 5 figures

References in corpus (5)

• Strong Field Approximation for Systems with Coulomb Interaction
• Tunneling dynamics in multiphoton ionization and attoclock calibration
• Attoclock revisited on electron tunnelling time
• The cross-over from tunnelling to multiphoton ionization of atoms
• Decoding electron tunnelling delay time by embracing wave-particle duality