Journal Article

PUBDB-2018-01720

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Velocity-Map Imaging for Emittance Characterization of Multiphoton Electron Emission from a Gold Surface

Ye, H.CFEL*Extern*DESY* ; Trippel, S. (Corresponding author)CFEL*DESY* ; Di Fraia, M.CFEL*DESY* ; Fallahi, A.CFEL*DESY* ; Mücke, O. D.CFEL*DESY* ; Kärtner, F. X.CFEL*Extern*DESY* ; Küpper, J.CFEL*DESY*

2018
American Physical Society College Park, Md. [u.a.]

This record in other databases:      

Please use a persistent id in citations: doi:10.1103/PhysRevApplied.9.044018  doi:10.3204/PUBDB-2018-01720

Abstract: A velocity-map-imaging spectrometer is demonstrated to characterize the normalized emittance (root-mean-square, rms) of photoemitted electron bunches. Both the two-dimensional spatial distribution and the projected velocity distribution images of photoemitted electrons are recorded by the detection system and analyzed to obtain the normalized emittance (rms). With the presented distribution function of the electron photoemission angles, a mathematical method is implemented to reconstruct the three-dimensional velocity distribution. As a first example, multiphoton emission from a planar Au surface is studied via irradiation at a glancing angle by intense 45-fs laser pulses at a central wavelength of 800 nm. The reconstructed energy distribution agrees very well with the Berglund-Spicer theory of photoemission. The normalized emittance (rms) of the intrinsic electron bunch is characterized to be 128 and 14 nm rad in the X and Y directions, respectively. The demonstrated imaging spectrometer has the ability to characterize the normalized emittance (rms) in a few minutes with a fine energy resolution of 0.2 meV in the image center and will, thereby, foster the further development of x-ray free-electron-laser injectors and ultrafast electron diffraction, and it opens up opportunities for studying correlated electron emission from surfaces and vacuum nanoelectronic devices.

---

Contributing Institute(s):

1. FS-CFEL-2 (CFEL-UFOX)
2. Ultrafast Lasers & X-rays Division (FS-CFEL-2)
3. CFEL-CMI (FS-CFEL-CMI)
4. Uni Hamburg / Experimentalphysik (UNI/EXP)
5. beauftragt von UNI (UNI/CUI)

Research Program(s):

1. 6211 - Extreme States of Matter: From Cold Ions to Hot Plasmas (POF3-621) (POF3-621)
2. CUI - Hamburger Zentrum für ultraschnelle Beobachtung (194651731) (194651731)
3. DFG project 281310551 - SOLSTICE - Festkörper in starken terahertz und infrarotenTräger-Einhüllende phasenstabilen Wellenformen (281310551) (281310551)
4. ACHIP - Laser Accelerators on a Chip (ACHIP_2015-10-01) (ACHIP_2015-10-01)
5. AXSIS - Frontiers in Attosecond X-ray Science: Imaging and Spectroscopy (609920) (609920)
6. COMOTION - Controlling the Motion of Complex Molecules and Particles (614507) (614507)

Experiment(s):

1. Experiments at CFEL

Appears in the scientific report 2018

---

Database coverage:
; ; ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

---