High-Resolution Experiments on Strong-Field Ionization of Atoms and Molecules: Test of Tunneling Theory, the Role of Doubly Excited States, and Channel-Selective Electron Spectra
In this thesis, the ionization of atoms and small molecules in strong laser fields is experimentally studied using a reaction microscope. The population of autoionizing doubly excited states in the laser fields is proven and a possible connection to the well-known dielectronic recombination processes is discussed.
The fundamental process of tunnel ionization in strong laser fields is subject of investigation in a pump-probe experiment with ultrashort laser pulses. A coherent superposition of electronic states in singly charged argon ions is created within the first, and subsequently tunnel-ionized with the second pulse. This gives access to state-selective information about the tunneling process and allows to test common models. Moreover, the ionization of krypton and argon at different wavelengths is studied, from the multiphoton to the tunneling regime. The wavelength-dependent investigations are furthermore extended to molecular hydrogen. In addition to ionization, this system might undergo different dissociative processes. Channel-selective electron momentum distributions are presented and compared to each other.
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6 Population of Doubly Excited States in Strong Laser Pulses
7 ChannelSelective Electron Spectra for H2 at Different Wavelengths
8 Conclusion and Outlook
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High-Resolution Experiments on Strong-Field Ionization of Atoms and ...
No preview available - 2016
amplifier angular angular momentum Ar++ argon Attosecond autoionization calculated chirped mirrors Coulomb explosion detected detector different wavelengths dissociation channel double ionization doubly excited dynamics electric field electron momentum distributions electronic core experiment experimental femtosecond flight Floquet frequency gas jet Gaussian intense laser fields interaction Ionization of Atoms ionization potential ionization process kinetic energy krypton laser intensity Lett longitudinal momentum measurements momenta momentum components momentum distributions obtained multiphoton noble gas nonlinear observed optical optical parametric amplifier orbitals parameters particles peaks phase photoionization photon Phys polarization pulse duration quantum number radiation recollision REMI resonator respective Rydberg Rydberg atom Sect single ionization singly charged SOWP spatial spectra spectrum spin-orbit Springer strong laser fields Strong-Field Ionization structures text for details Ti:sapphire trajectories tunnel ionization tunneling process tunneling regime typical ultrashort ultrashort pulses University of Heidelberg visible wave functions wavelengths width