Abstract
We present molecular photoionization processes by intense attosecond ultraviolet laser pulses from numerical solutions of time-dependent Schrödinger equations. Simulations preformed on a single electron diatomic show minima in molecular photoelectron energy spectra resulting from two center interference effects which depend strongly on molecular alignment. We attribute such sensitivity to the spatial orientation asymmetry of the photoionization process from the two nuclei. A similar influence on photoelectron kinetic energies is also presented.
Highlights
Real time observation of molecular structure and dynamics by photoelectron spectroscopy has attracted considerable attention lately[1–3] with the rapid developments of ultrashort ultrafast laser pulses.[4,5] In the past electron interference patterns in molecular photoelectron energy spectra (MPES) have been widely studied for imaging of molecular structure.[6–9] The interference of electron waves emitted coherently from the two atoms in a diatomic molecule was first predicted by Cohen and Fano[10] and Kaplan and Markin[11] more than forty years ago in perturbative single photon ionization
We focus on the effects of molecular alignment on the two-center electron interference in single electron photoionization with linearly polarized attosecond UV laser pulses
Single photon ionization processes are simulated in the ultrashort attosecond laser pulses with frequencies x > Ip
Summary
Real time observation of molecular structure and dynamics by photoelectron spectroscopy has attracted considerable attention lately[1–3] with the rapid developments of ultrashort ultrafast laser pulses.[4,5] In the past electron interference patterns in molecular photoelectron energy spectra (MPES) have been widely studied for imaging of molecular structure.[6–9] The interference of electron waves emitted coherently from the two atoms in a diatomic molecule was first predicted by Cohen and Fano[10] and Kaplan and Markin[11] more than forty years ago in perturbative single photon ionization. The wavefunctions are described by a linear combination of the orbitals of the two separated atoms, which results in a molecular Young’s double-slit experiment Such interference model has been extended to nonperturbative photoionization with few-cycle intense laser pulses.[12,13]. A novel destructive interference in high-order angular MATI spectra of a diatomic molecule involving four geometric orbits has been found experimentally and confirmed theoretically based on molecular strong field approximation (MSFA) simulations for the suppressed ionization of the O2 molecule.[20]. Such electron destructive interference with minima in MATI has been investigated in circularly polarized infrared (IR) laser pulses.[21]. Measuring photoelectron angular distributions of oriented molecules O2, N2, and CO2, allow to study electron-ion scattering dynamics[24] from laser induced electron diffraction (LIED).[6,12]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
