A simple photoionization scheme for characterizing electron and ion spectrometers

Wituschek, Andreas; Vangerow, J. von; Grzesiak, Jonas; Stienkemeier, F.; Mudrich, M.

doi:10.1063/1.4960401

Cited by 13 publications

(4 citation statements)

References 22 publications

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“…Over this short measurement time, the data quality is not affected by long-term drifts of the laser system. Finally, the 3D PMD is energy-calibrated using the procedure described in [93]. Throughout the paper, we show energy-calibrated PMDs.…”

Section: Methodsmentioning

confidence: 99%

Three-dimensional photoelectron holography with trichromatic polarization-tailored laser pulses

Köhnke

Eickhoff

Bayer

et al. 2022

J. Phys. B: At. Mol. Opt. Phys.

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We present a three-dimensional (3D) photoelectron wave packet holography scheme based on polarization-tailored trichromatic femtosecond laser pulses for the determination of quantum phases in atomic multiphoton ionization (MPI). Experimentally, we combine supercontinuum polarization pulse shaping with photoelectron tomography for the reconstruction of the 3D photoelectron momentum distribution (PMD). To demonstrate the 3D photoelectron holography scheme, we superimpose a sculptured wave packet encoding a relative continuum phase with a reference wave packet. In particular, we create a sculptured angular momentum superposition wave packet by (2+1) resonance-enhanced MPI of potassium atoms using a counter-rotating circularly polarized bichromatic pulse sequence. The sculptured wave packet, consisting of states with different orbital angular momentum quantum numbers, interferes with the reference wave packet generated by direct 3-photon ionization with a circularly polarized pulse of the third color. Depending on the circularity of the reference pulse, interference of both wave packets gives rise to 3D photoelectron holograms with c 2 or c 4 rotational symmetry in the laser polarization plane, i.e., in the azimuthal direction. In the polar direction, the azimuthal interference pattern undergoes a phase-shift revealing the relative quantum phase between the p- and f-type continuum partial waves in the sculptured wave packet. We determine the relative continuum phase by fitting the parameters of an analytical model of the hologram to the measured 3D PMD and confirm the result by direct extraction of the continuum phase difference from the polar-angle-dependent azimuthal phase-shift of the photoelectron angular distribution.

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Section: Methodsmentioning

confidence: 99%

Three-dimensional photoelectron holography with trichromatic polarization-tailored laser pulses

Köhnke

Eickhoff

Bayer

et al. 2022

J. Phys. B: At. Mol. Opt. Phys.

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“…The patterns that arise appear as expanded horizontal stripes with a suppressed velocity spread. Exploiting the resulting spatial information facilitated the spatially resolved mass spectrometric (MS) imaging of analytes on surfaces and molecular dynamics studies. ,− In particular, the latter showed the spatial height and width of formed atomic and molecular ions and the overall SMI of the AB/MB profiles. ,, In addition, molecular ion visualization helped the temporal and spatial overlap of two laser beams in a noncollinear arrangement, characterizing the 1D, 2D, and 3D imaging modes, and mapping the initial source distribution of electron emission from a surface . Moreover, we demonstrated that SMI assists in aligning and overlapping multiple laser beams for monitoring ionization-loss stimulated Raman spectra and in pump–probe experiments in general.…”

Section: Introductionmentioning

confidence: 90%

Kinetic Energy-Broadened Spatial Map Imaging for Recovering Dynamical Information

2022

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The highly successful velocity map imaging (VMI) technique plays a central role in revealing light−matter interactions. Here we demonstrate the related but distinct kinetic energy-broadened spatial map imaging (KESMI) option for recovering KE and angular recoil information on photophysical processes using a VMI system operating in different outof-focus modes. The characteristic single or double stripes and related steps in the vertical intensity profiles of KESMIs of photoelectrons (PEs) from Ar ionization allow breakthrough developments of a potent global model that enables an understanding and analysis of these patterns. These signatures reflect the relationship between the observed features and predicted convolved discrete KEs and angular distributions. The derivation of the velocity distribution of the PEs ensuing from the ionization of a single H 2 O quantum state based on the measured and simulated KESMI provides another rigorous test demonstrating and realizing the feasibility of this new approach, which holds future promise on its own or combined with VMI.

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“…A lens with 175 mm focal length was mounted on a translation stage to focus the light into the center of the interaction region. By shifting the focus position in the interaction region horizontally and vertically, we calibrated the positions on the detector and the ion time-offlight, respectively 50 . Furthermore, a gratingstabilized diode laser is at our disposal to implement a simple scheme for photoionization of potassium atoms for precise calibration measurements 50 .…”

Section: Spectrometer and Vmi Potentialsmentioning

confidence: 99%

A new endstation for extreme-ultraviolet spectroscopy of free clusters and nanodroplets

Bastian,

Asmussen,

Ltaief

et al. 2022

Preprint

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We present a new endstation for the AMOLine of the ASTRID2 synchrotron at Aarhus University, which combines a cluster and nanodroplet beam source with a velocity map imaging and time-of-flight spectrometer for coincidence imaging spectroscopy. Extreme-ultraviolet spectroscopy of free nanoparticles is a powerful tool for studying the photophysics and photochemistry of resonantly excited or ionized nanometersized condensed-phase systems. Here we demonstrate this capability by performing photoelectron-photoion coincidence (PEPICO) experiments with pure and doped superfluid helium nanodroplets. Different doping options and beam sources provide a versatile platform to generate various van der Waals clusters as well as He nanodroplets. We present a detailed characterization of the new setup and present examples of its use for measuring high-resolution yield spectra of charged particles, time-of-flight ion mass spectra, anion-cation coincidence spectra, multi-coincidence electron spectra and angular distributions. A particular focus of the research with this new endstation is on intermolecular charge and energy-transfer processes in heterogeneous nanosystems induced by valence-shell excitation and ionization.

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A simple photoionization scheme for characterizing electron and ion spectrometers

Cited by 13 publications

References 22 publications

Three-dimensional photoelectron holography with trichromatic polarization-tailored laser pulses

Three-dimensional photoelectron holography with trichromatic polarization-tailored laser pulses

Kinetic Energy-Broadened Spatial Map Imaging for Recovering Dynamical Information

A new endstation for extreme-ultraviolet spectroscopy of free clusters and nanodroplets

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