Suppression of the vacuum space-charge effect in fs-photoemission by a retarding electrostatic front lens
- Publikationstyp:
- Zeitschriftenaufsatz
- Metadaten:
-
- Autoren
- G Schoenhense
- D Kutnyakhov
- F Pressacco
- M Heber
- N Wind
- SY Agustsson
- S Babenkov
- D Vasilyev
- O Fedchenko
- S Chernov
- L Rettig
- B Schonhense
- L Wenthaus
- G Brenner
- S Dziarzhytski
- S Palutke
- SK Mahatha
- N Schirmel
- H Redlin
- B Manschwetus
- I Hartl
- Yu Matveyev
- A Gloskovskii
- C Schlueter
- V Shokeen
- H Duerr
- TK Allison
- M Beye
- K Rossnagel
- HJ Elmers
- K Medjanik
- Autoren-URL
- https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000691996900003&DestLinkType=FullRecord&DestApp=WOS_CPL
- DOI
- 10.1063/5.0046567
- eISSN
- 1089-7623
- Externe Identifier
- Clarivate Analytics Document Solution ID: UK5GB
- PubMed Identifier: 34243258
- ISSN
- 0034-6748
- Ausgabe der Veröffentlichung
- 5
- Zeitschrift
- REVIEW OF SCIENTIFIC INSTRUMENTS
- Artikelnummer
- ARTN 053703
- Datum der Veröffentlichung
- 2021
- Status
- Published
- Titel
- Suppression of the vacuum space-charge effect in fs-photoemission by a retarding electrostatic front lens
- Sub types
- Article
- Ausgabe der Zeitschrift
- 92
Datenquelle: Web of Science (Lite)
- Andere Metadatenquellen:
-
- Abstract
- <jats:p>The performance of time-resolved photoemission experiments at fs-pulsed photon sources is ultimately limited by the e–e Coulomb interaction, downgrading energy and momentum resolution. Here, we present an approach to effectively suppress space-charge artifacts in momentum microscopes and photoemission microscopes. A retarding electrostatic field generated by a special objective lens repels slow electrons, retaining the k-image of the fast photoelectrons. The suppression of space-charge effects scales with the ratio of the photoelectron velocities of fast and slow electrons. Fields in the range from −20 to −1100 V/mm for Ekin = 100 eV to 4 keV direct secondaries and pump-induced slow electrons back to the sample surface. Ray tracing simulations reveal that this happens within the first 40 to 3 μm above the sample surface for Ekin = 100 eV to 4 keV. An optimized front-lens design allows switching between the conventional accelerating and the new retarding mode. Time-resolved experiments at Ekin = 107 eV using fs extreme ultraviolet probe pulses from the free-electron laser FLASH reveal that the width of the Fermi edge increases by just 30 meV at an incident pump fluence of 22 mJ/cm2 (retarding field −21 V/mm). For an accelerating field of +2 kV/mm and a pump fluence of only 5 mJ/cm2, it increases by 0.5 eV (pump wavelength 1030 nm). At the given conditions, the suppression mode permits increasing the slow-electron yield by three to four orders of magnitude. The feasibility of the method at high energies is demonstrated without a pump beam at Ekin = 3830 eV using hard x rays from the storage ring PETRA III. The approach opens up a previously inaccessible regime of pump fluences for photoemission experiments.</jats:p>
- Autoren
- G Schönhense
- D Kutnyakhov
- F Pressacco
- M Heber
- N Wind
- SY Agustsson
- S Babenkov
- D Vasilyev
- O Fedchenko
- S Chernov
- L Rettig
- B Schönhense
- L Wenthaus
- G Brenner
- S Dziarzhytski
- S Palutke
- SK Mahatha
- N Schirmel
- H Redlin
- B Manschwetus
- I Hartl
- Yu Matveyev
- A Gloskovskii
- C Schlueter
- V Shokeen
- H Duerr
- TK Allison
- M Beye
- K Rossnagel
- HJ Elmers
- K Medjanik
- DOI
- 10.1063/5.0046567
- eISSN
- 1089-7623
- ISSN
- 0034-6748
- Ausgabe der Veröffentlichung
- 5
- Zeitschrift
- Review of Scientific Instruments
- Sprache
- en
- Online publication date
- 2021
- Datum der Veröffentlichung
- 2021
- Status
- Published
- Herausgeber
- AIP Publishing
- Herausgeber URL
- http://dx.doi.org/10.1063/5.0046567
- Datum der Datenerfassung
- 2023
- Titel
- Suppression of the vacuum space-charge effect in fs-photoemission by a retarding electrostatic front lens
- Ausgabe der Zeitschrift
- 92
Datenquelle: Crossref
- Abstract
- The performance of time-resolved photoemission experiments at fs-pulsed photon sources is ultimately limited by the e-e Coulomb interaction, downgrading energy and momentum resolution. Here, we present an approach to effectively suppress space-charge artifacts in momentum microscopes and photoemission microscopes. A retarding electrostatic field generated by a special objective lens repels slow electrons, retaining the k-image of the fast photoelectrons. The suppression of space-charge effects scales with the ratio of the photoelectron velocities of fast and slow electrons. Fields in the range from -20 to -1100 V/mm for E<sub>kin</sub> = 100 eV to 4 keV direct secondaries and pump-induced slow electrons back to the sample surface. Ray tracing simulations reveal that this happens within the first 40 to 3 μm above the sample surface for E<sub>kin</sub> = 100 eV to 4 keV. An optimized front-lens design allows switching between the conventional accelerating and the new retarding mode. Time-resolved experiments at E<sub>kin</sub> = 107 eV using fs extreme ultraviolet probe pulses from the free-electron laser FLASH reveal that the width of the Fermi edge increases by just 30 meV at an incident pump fluence of 22 mJ/cm<sup>2</sup> (retarding field -21 V/mm). For an accelerating field of +2 kV/mm and a pump fluence of only 5 mJ/cm<sup>2</sup>, it increases by 0.5 eV (pump wavelength 1030 nm). At the given conditions, the suppression mode permits increasing the slow-electron yield by three to four orders of magnitude. The feasibility of the method at high energies is demonstrated without a pump beam at E<sub>kin</sub> = 3830 eV using hard x rays from the storage ring PETRA III. The approach opens up a previously inaccessible regime of pump fluences for photoemission experiments.
- Addresses
- Johannes Gutenberg-Universität, Institut für Physik, D-55099 Mainz, Germany.
- Autoren
- G Schönhense
- D Kutnyakhov
- F Pressacco
- M Heber
- N Wind
- SY Agustsson
- S Babenkov
- D Vasilyev
- O Fedchenko
- S Chernov
- L Rettig
- B Schönhense
- L Wenthaus
- G Brenner
- S Dziarzhytski
- S Palutke
- SK Mahatha
- N Schirmel
- H Redlin
- B Manschwetus
- I Hartl
- Yu Matveyev
- A Gloskovskii
- C Schlueter
- V Shokeen
- H Duerr
- TK Allison
- M Beye
- K Rossnagel
- HJ Elmers
- K Medjanik
- DOI
- 10.1063/5.0046567
- eISSN
- 1089-7623
- Externe Identifier
- PubMed Identifier: 34243258
- Funding acknowledgements
- DoE Basic Energy Science: DE-SC0016017
- Deutsche Forschungsgemeinschaft: SFB 925-170620586
- Bundesministerium für Bildung und Forschung: 05K19UM1
- Deutsche Forschungsgemeinschaft: Emmy Noether grant RE3977-1
- Bundesministerium für Bildung und Forschung: 05K19UM2
- Deutsche Forschungsgemeinschaft: TRR173 268565370
- Open access
- false
- ISSN
- 0034-6748
- Ausgabe der Veröffentlichung
- 5
- Zeitschrift
- The Review of scientific instruments
- Sprache
- eng
- Medium
- Paginierung
- 053703
- Datum der Veröffentlichung
- 2021
- Status
- Published
- Datum der Datenerfassung
- 2021
- Titel
- Suppression of the vacuum space-charge effect in fs-photoemission by a retarding electrostatic front lens.
- Sub types
- Journal Article
- Ausgabe der Zeitschrift
- 92
Datenquelle: Europe PubMed Central
- Abstract
- The performance of time-resolved photoemission experiments at fs-pulsed photon sources is ultimately limited by the e-e Coulomb interaction, downgrading energy and momentum resolution. Here, we present an approach to effectively suppress space-charge artifacts in momentum microscopes and photoemission microscopes. A retarding electrostatic field generated by a special objective lens repels slow electrons, retaining the k-image of the fast photoelectrons. The suppression of space-charge effects scales with the ratio of the photoelectron velocities of fast and slow electrons. Fields in the range from -20 to -1100 V/mm for Ekin = 100 eV to 4 keV direct secondaries and pump-induced slow electrons back to the sample surface. Ray tracing simulations reveal that this happens within the first 40 to 3 μm above the sample surface for Ekin = 100 eV to 4 keV. An optimized front-lens design allows switching between the conventional accelerating and the new retarding mode. Time-resolved experiments at Ekin = 107 eV using fs extreme ultraviolet probe pulses from the free-electron laser FLASH reveal that the width of the Fermi edge increases by just 30 meV at an incident pump fluence of 22 mJ/cm2 (retarding field -21 V/mm). For an accelerating field of +2 kV/mm and a pump fluence of only 5 mJ/cm2, it increases by 0.5 eV (pump wavelength 1030 nm). At the given conditions, the suppression mode permits increasing the slow-electron yield by three to four orders of magnitude. The feasibility of the method at high energies is demonstrated without a pump beam at Ekin = 3830 eV using hard x rays from the storage ring PETRA III. The approach opens up a previously inaccessible regime of pump fluences for photoemission experiments.
- Autoren
- G Schönhense
- D Kutnyakhov
- F Pressacco
- M Heber
- N Wind
- SY Agustsson
- S Babenkov
- D Vasilyev
- O Fedchenko
- S Chernov
- L Rettig
- B Schönhense
- L Wenthaus
- G Brenner
- S Dziarzhytski
- S Palutke
- SK Mahatha
- N Schirmel
- H Redlin
- B Manschwetus
- I Hartl
- Yu Matveyev
- A Gloskovskii
- C Schlueter
- V Shokeen
- H Duerr
- TK Allison
- M Beye
- K Rossnagel
- HJ Elmers
- K Medjanik
- Autoren-URL
- https://www.ncbi.nlm.nih.gov/pubmed/34243258
- DOI
- 10.1063/5.0046567
- eISSN
- 1089-7623
- Ausgabe der Veröffentlichung
- 5
- Zeitschrift
- Rev Sci Instrum
- Sprache
- eng
- Country
- United States
- Paginierung
- 053703
- Datum der Veröffentlichung
- 2021
- Status
- Published
- Titel
- Suppression of the vacuum space-charge effect in fs-photoemission by a retarding electrostatic front lens.
- Sub types
- Journal Article
- Ausgabe der Zeitschrift
- 92
Datenquelle: PubMed
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