Towards The Resolution Limit Of Pfi-zeke Photoelectron Spectroscopy

Herburger, Holger

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https://hdl.handle.net/2142/116853 Copy

Description

Title

Towards The Resolution Limit Of Pfi-zeke Photoelectron Spectroscopy

Author(s)

Herburger, Holger

Contributor(s)

• Merkt, Frédéric
• Hollenstein, Urs
• Wirth, Vincent

Issue Date

2022-06-22

Keyword(s)

Instrument/Technique Demonstration

Abstract

The spectral resolution in Pulsed-Field Ionization Zero-Kinetic Energy (PFI-ZEKE) photoelectron spectroscopy is related to the state selectivity in the ionization process of the Rydberg states. The selectivity is determined by the applied electric field pulse sequence. Hollenstein \textit{et al.}\footnote{U.\,Hollenstein, R.\,Seiler, H.\,Schmutz, M.\,Andrist, and F.\,Merkt, {\em J. Chem. Phys.} {\bf 115}, 5461--5469 (2001).} used discrete electric field pulses with increasing field strength in combination with a preceding field pulse of opposite polarity. By using such field pulse sequences with the smallest possible field step size (i.e., approximately 9\,mV/cm), a spectral resolution of 0.06\,cm$^{-1}$ could be achieved. To improve the resolution further Harper \textit{et al.}\footnote{Oliver\,J.\,Harper, Ning\,L.\,Chen, S\'everine\,Boy\'e-P\'eronne, and B\'erenger\,Gans, {\em Phys. Chem. Chem. Phys.} {\bf 24}, 2777--2784 (2022).} recently suggested replacing the sequence of field steps by a linearly increasing field, as used earlier by Reiser \textit{et al.}\footnote{ G.\,Reiser, W.\,Habenicht, K.\,M\"uller-Dethlefs, and E.\,W.\,Schlag, {\em Chem. Phys. Lett.} {\bf 152}, 119–123 (1988).}, in combination with a prepulse of opposite polarity and obtained promising results on the PFI-ZEKE photoelectron spectrum of NO and CO$_2$. Using a home-built narrow-bandwidth long-pulse laser system (pulse lengths up to 50\,ns) in combination with a field pulse ramp$^{b, c}$, we explore the resolution limit of this approach. To avoid overlap of spectral lines, we chose an atomic system, Ar, as test system and recorded PFI-ZEKE photoelectron spectra of transitions from the metastable states (3p)$^5$(4s)$[3/2]_2$ $\left(^3\text{P}_2\right)$ and (3p)$^5$(4s)$'[1/2]_0$ $\left(^3\text{P}_0\right)$ to the (3p)$^5$ $^2$P$_{3/2, 1/2}$ states of Ar$^+$. This system also offers the advantage of a precisely known ionization energy\footnote{V.\,L.\,Sukhorukov, I.\,D.\,Petrov, M.\,Sch\"afer, F.\,Merkt, M.-W.\,Ruf, and H.\,Hotop, {\em J. Phys. B: At. Mol. Opt. Phys.} {\bf 45}, 092001 (2012) and references therein.} with which the ionization energy determined with the new method can be compared.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Handle URL

https://hdl.handle.net/2142/116853

DOI

https://doi.org/10.15278/isms.2022.WJ05

Copyright and License Information

Copyright 2022 held by the authors

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