Angle-Resolved High-Order Above-Threshold Ionization of a Molecule: Sensitive Tool for Molecular Characterization

Abstract

The strong-field approximation for ionization of diatomic molecules by an intense laser field is generalized to include rescattering of the ionized electron off the various centers of its molecular parent ion. The resulting spectrum and its interference structure strongly depend on the symmetry of the ground state molecular orbital. For N2, if the laser polarization is perpendicular to the molecular axis, we observe a distinct minimum in the emission spectrum, which survives focal averaging and allows determination of, e.g., the internuclear separation. In contrast, for O2, rescattering is absent in the same situation.

Angular distributions of atomic photoelectrons produced in the uv and xuv regimes

“…The present results are of relevance for single atoms and molecules (see e.g. [35]). They also apply to atom ensembles because, as we have shown, the total PAD of electrons ionized from all p-states is independent of the orientation of the atoms relative to the laser field.…”

Inducing elliptically polarized high-order harmonics from aligned molecules with linearly polarized femtosecond pulses

“…The resulting harmonics are referred to as exchange harmonics [8]. A similar idea was explored in an earlier paper [19], and its above-threshold ionization analog is well known in the literature [20][21][22].…”

Field modulation of Rydberg-state populations of NO studied by femtosecond time-resolved photoelectron imaging

“…Interesting phenomena have been reported in past decades in an intense femtosecond laser field, including abovethreshold ionization [4,5], the ac Stark shift [6,7], harmonic generation [5,8], coherent phenomena [9,10], and laser-induced continuum structure [11]. Recently, chemical reaction control has become a hot topic in femtochemistry [6,7,[12][13][14][15].…”