Construction of a high-resolution photoelectron spectrometer
Abstract: This work demonstrates, theoretically and experimentally, a major improvement to the energy resolution of magnetic bottle time of flight photoelectron spectroscopy on free anions in the UV energy range.
MBTOF-PES, or MBPES, is a widely established method for studying free atomic, molecular and cluster ions. The main advantage of MBPES is its high collection efficiency, making it ideally suited to the investigation of size-selected clusters, many of which can not be produced in high intensities. However, UV-MBPES usually provides comparably imprecise measurements. A resolution (defined as the full width at half maximum of a spectral peak) of 2% of the photoelectron energy is considered state of the art.
In MBPES, electrons, detached from ions by a laser pulse and emitted in different directions, are redirected towards a detector by a magnetic field. This redirection causes differences in flight time, thus reducing the resolution of the energy measurement.
The main feature of the new method is a time-variable electric field, which slightly decelerates the electrons after a part of their flight path. The field decreases over time, so electrons encountering the field later are decelerated less. It is shown that this allows electrons to be time-focused to first order in the detector plane, greatly reducing the TOF error caused by the redirection and other effects.
It is further shown that a considerable part of the remaining TOF error can be compensated by exploiting the direction-dependent final velocity of the electrons in the magnetic field. Second-order time focusing with respect to the emission angle of the electrons can thus be achieved, further improving the energy resolution of the instrument.
As part of this work, a new magnetic bottle time of flight spectrometer was designed, built and put into operation, as the first experimental realization of the proposed methods of first and second order TOF focusing. The new instrument was tested recording photoelectron spectra of negative platinum ions at a photon energy of 4.66 eV (266 nm). In the measured electron energy range of 0.23 eV to 2.5 eV. absolute FWHM resolutions are between 4.4 meV and 7.6 meV. For all measured energies above 0.85 eV, the resulting relative resolution is better than 0.5%, reaching 0.3% at 2.5 eV
- Standort
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Deutsche Nationalbibliothek Frankfurt am Main
- Umfang
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Online-Ressource
- Sprache
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Englisch
- Anmerkungen
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Universität Freiburg, Dissertation, 2022
- Schlagwort
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Spectrometer
- Ereignis
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Veröffentlichung
- (wo)
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Freiburg
- (wer)
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Universität
- (wann)
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2022
- Urheber
- Beteiligte Personen und Organisationen
- DOI
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10.6094/UNIFR/226532
- URN
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urn:nbn:de:bsz:25-freidok-2265327
- Rechteinformation
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Letzte Aktualisierung
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25.03.2025, 13:42 MEZ
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Deutsche Nationalbibliothek. Bei Fragen zum Objekt wenden Sie sich bitte an den Datenpartner.
Beteiligte
Entstanden
- 2022
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