Single-hemisphere photoelectron momentum microscope with time-of-flight recording

Publikationstyp:
Zeitschriftenaufsatz
Metadaten:
Autoren
  • G Schoenhense
  • S Babenkov
  • D Vasilyev
  • H-J Elmers
  • K Medjanik
Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000599512900001&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.1063/5.0024074
eISSN
1089-7623
Externe Identifier
  • Clarivate Analytics Document Solution ID: PG1OU
  • PubMed Identifier: 33379996
ISSN
0034-6748
Ausgabe der Veröffentlichung
12
Zeitschrift
REVIEW OF SCIENTIFIC INSTRUMENTS
Artikelnummer
ARTN 123110
Datum der Veröffentlichung
2020
Status
Published
Titel
Single-hemisphere photoelectron momentum microscope with time-of-flight recording
Sub types
  • Article
Ausgabe der Zeitschrift
91

Datenquelle: Web of Science (Lite)

Andere Metadatenquellen:
Autoren
  • G Schönhense
  • S Babenkov
  • D Vasilyev
  • H-J Elmers
  • K Medjanik
DOI
10.1063/5.0024074
eISSN
1089-7623
ISSN
0034-6748
Ausgabe der Veröffentlichung
12
Zeitschrift
Review of Scientific Instruments
Sprache
en
Paginierung
123110 - 123110
Datum der Veröffentlichung
2020
Status
Published
Herausgeber
AIP Publishing
Herausgeber URL
http://dx.doi.org/10.1063/5.0024074
Datum der Datenerfassung
2023
Titel
Single-hemisphere photoelectron momentum microscope with time-of-flight recording
Ausgabe der Zeitschrift
91

Datenquelle: Crossref

Abstract
Photoelectron momentum microscopy is an emerging powerful method for angle-resolved photoelectron spectroscopy (ARPES), especially in combination with imaging spin filters. These instruments record k<sub>x</sub>-k<sub>y</sub> images, typically exceeding a full Brillouin zone. As energy filters, double-hemispherical or time-of-flight (ToF) devices are in use. Here, we present a new approach for momentum mapping of the full half-space, based on a large single hemispherical analyzer (path radius of 225 mm). Excitation by an unfocused He lamp yielded an energy resolution of 7.7 meV. The performance is demonstrated by k-imaging of quantum-well states in Au and Xe multilayers. The α<sup>2</sup>-aberration term (α, entrance angle in the dispersive plane) and the transit-time spread of the electrons in the spherical field are studied in a large pass-energy (6 eV-660 eV) and angular range (α up to ±7°). It is discussed how the method circumvents the preconditions of previous theoretical work on the resolution limitation due to the α<sup>2</sup>-term and the transit-time spread, being detrimental for time-resolved experiments. Thanks to k-resolved detection, both effects can be corrected numerically. We introduce a dispersive-plus-ToF hybrid mode of operation, with an imaging ToF analyzer behind the exit slit of the hemisphere. This instrument captures 3D data arrays I (E<sub>B</sub>, k<sub>x</sub>, k<sub>y</sub>), yielding a gain up to N<sup>2</sup> in recording efficiency (N being the number of resolved time slices). A key application will be ARPES at sources with high pulse rates such as synchrotrons with 500 MHz time structure.
Addresses
  • Johannes Gutenberg-Universität, Institut für Physik, 55128 Mainz, Germany.
Autoren
  • G Schönhense
  • S Babenkov
  • D Vasilyev
  • H-J Elmers
  • K Medjanik
DOI
10.1063/5.0024074
eISSN
1089-7623
Externe Identifier
  • PubMed Identifier: 33379996
Open access
false
ISSN
0034-6748
Ausgabe der Veröffentlichung
12
Zeitschrift
The Review of scientific instruments
Sprache
eng
Medium
Print
Paginierung
123110
Datum der Veröffentlichung
2020
Status
Published
Datum der Datenerfassung
2020
Titel
Single-hemisphere photoelectron momentum microscope with time-of-flight recording.
Sub types
  • Journal Article
Ausgabe der Zeitschrift
91

Datenquelle: Europe PubMed Central

Abstract
Photoelectron momentum microscopy is an emerging powerful method for angle-resolved photoelectron spectroscopy (ARPES), especially in combination with imaging spin filters. These instruments record kx-ky images, typically exceeding a full Brillouin zone. As energy filters, double-hemispherical or time-of-flight (ToF) devices are in use. Here, we present a new approach for momentum mapping of the full half-space, based on a large single hemispherical analyzer (path radius of 225 mm). Excitation by an unfocused He lamp yielded an energy resolution of 7.7 meV. The performance is demonstrated by k-imaging of quantum-well states in Au and Xe multilayers. The α2-aberration term (α, entrance angle in the dispersive plane) and the transit-time spread of the electrons in the spherical field are studied in a large pass-energy (6 eV-660 eV) and angular range (α up to ±7°). It is discussed how the method circumvents the preconditions of previous theoretical work on the resolution limitation due to the α2-term and the transit-time spread, being detrimental for time-resolved experiments. Thanks to k-resolved detection, both effects can be corrected numerically. We introduce a dispersive-plus-ToF hybrid mode of operation, with an imaging ToF analyzer behind the exit slit of the hemisphere. This instrument captures 3D data arrays I (EB, kx, ky), yielding a gain up to N2 in recording efficiency (N being the number of resolved time slices). A key application will be ARPES at sources with high pulse rates such as synchrotrons with 500 MHz time structure.
Autoren
  • G Schönhense
  • S Babenkov
  • D Vasilyev
  • H-J Elmers
  • K Medjanik
Autoren-URL
https://www.ncbi.nlm.nih.gov/pubmed/33379996
DOI
10.1063/5.0024074
eISSN
1089-7623
Ausgabe der Veröffentlichung
12
Zeitschrift
Rev Sci Instrum
Sprache
eng
Country
United States
Paginierung
123110
Datum der Veröffentlichung
2020
Status
Published
Titel
Single-hemisphere photoelectron momentum microscope with time-of-flight recording.
Sub types
  • Journal Article
Ausgabe der Zeitschrift
91

Datenquelle: PubMed

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