scholarly journals Velocity-Map Imaging for Emittance Characterization of Multiphoton Electron Emission from a Gold Surface

2018 ◽  
Vol 9 (4) ◽  
Author(s):  
Hong Ye ◽  
Sebastian Trippel ◽  
Michele Di Fraia ◽  
Arya Fallahi ◽  
Oliver D. Mücke ◽  
...  
Keyword(s):  
Electron Emission ◽  
Gold Surface ◽  
Velocity Map Imaging

Spectral and cyclic voltammetric characterization of self-assembled monolayers on gold of pyrene end-labeled oligonucleotide duplexes

1999 ◽  
Vol 77 (5-6) ◽  
pp. 1077-1084 ◽  
Author(s):  
R Scott Reese ◽  
Marye Anne Fox
Keyword(s):  
Gold Surface ◽  
Self Assembled Monolayers ◽  
Self Assembled Monolayer ◽  
Surface Emission ◽  
Assembled Monolayers ◽  
Oligonucleotide Duplex ◽  
Self Assembled ◽  
Duplex Formation

Self-assembled monolayers of sulfur-terminated oligonucleotide duplexes were formed on flat gold surfaces, either by exposure of a self-assembled monolayer bearing one oligonucleotide strand to the complementary strand or by preformation of a oligonucleotide duplex that was then deposited on a fresh gold surface. Virtually identical spectral behavior was observed whether the duplex was produced before deposition or by in situ complementary association. With a duplex bearing an appropriate pyrene end-label, the resulting thin film was photoresponsive. Surface emission measurements show no evidence for pyrene aggregation on the modified surfaces. The polarity of the photocurrent, reflecting photoinduced electron transfer initiated by photoexcitation of pyrene, is opposite that expected from the oligonucleotide-mediated reduction of the appended pyrene excited state.Key words: oligonucleotide, self-assembled monolayer, duplex formation, photoelectrochemistry, surface emission.

An instrument combining an electrospray ionization source and a velocity-map imaging spectrometer for studying delayed electron emission of polyanions

2016 ◽  
Vol 87 (3) ◽  
pp. 033103 ◽  
Author(s):  
Bruno Concina ◽  
Evangelos Papalazarou ◽  
Marc Barbaire ◽  
Christian Clavier ◽  
Jacques Maurelli ◽  
...  
Keyword(s):  
Electrospray Ionization ◽  
Electron Emission ◽  
Velocity Map Imaging ◽  
Ionization Source ◽  
Imaging Spectrometer

scholarly journals High Photocurrent Density and Continuous Electron Emission Characterization of a Multi-Alkali Antimonide Photocathode

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 1991
Author(s):  
Jun Dai ◽  
Yikun Ding ◽  
Cunjun Ruan ◽  
Xiangyan Xu ◽  
Hulin Liu
Keyword(s):  
Electric Fields ◽  
Current Density ◽  
Electron Emission ◽  
Continuous Wave ◽  
High Current Density ◽  
Optical Power ◽  
Photocurrent Density ◽  
Maximum Current ◽  
Section Electron

High photocurrent density cathodes that enable small cross-section electron beams are required for high-power terahertz vacuum devices. Multi-alkali antimonide photocathodes may be well suited for generating sub-mm electron beam sources. This paper involves the repeatability, stability, uniformity, and linearity experiments of the multi-alkali antimonide photocathodes electron emission operations under a continuous-wave 450 nm laser with a bias voltage of 5000 V. The effect of heat, electric contact, and cathode surface roughness to emission characterizations is analyzed. The methods to maintain the high-current-density emission and avoid the fatigue of the photocathode are verified. The emission can be repeated with increased optical power. The stable photocurrent density of near 1 A/cm2 and maximum current density of near 1.43 A/cm2 is recorded. The continuous photocurrent density is significantly improved compared to the current density reported in traditional applications. It is found that the current curves measuring at different areas of the photocathode differ greatly after the laser power of 800 mW. The increase in current for some areas may be attributed to the conductive current caused by built-in electric fields between the emission rough area and its adjacent areas.

Characterization of InAs/AlSb tunneling double barrier heterostructure by ballistic electron emission microscope with InAs as base electrode

2003 ◽  
Vol 0 (3) ◽  
pp. 986-991 ◽  
Author(s):  
J. Vaniš ◽  
D. H. Chow ◽  
J. Pangrác ◽  
F. Šroubek ◽  
T. C. McGill ◽  
...  
Keyword(s):  
Electron Emission ◽  
Double Barrier ◽  
Ballistic Electron ◽  
Base Electrode

Self-Assembled Hexasaccharides:  Surface Characterization of Thiol-Terminated Sugars Adsorbed on a Gold Surface

Langmuir ◽  
1996 ◽  
Vol 12 (25) ◽  
pp. 6074-6082 ◽  
Author(s):  
Michaela C. Fritz ◽  
Georg Hähner ◽  
Nicholas D. Spencer ◽  
Roland Bürli ◽  
Andrea Vasella
Keyword(s):  
Surface Characterization ◽  
Gold Surface ◽  
Self Assembled

Terahertz-Induced Electron Emission from a Gold Surface

2019 ◽  
Author(s):  
Shaoxian Li ◽  
Jozsef A. Fulop ◽  
Priyo S. Nugraha ◽  
Ashutosh Sharma ◽  
Csaba Lombosi ◽  
...  
Keyword(s):  
Electron Emission ◽  
Gold Surface

Design and characterization of a velocity-map imaging apparatus for low-energy photo-ion spectroscopy using magneto-optically trapped atoms

2021 ◽  
Vol 92 (4) ◽  
pp. 043103
Author(s):  
Feng Fang ◽  
Wenchang Zhou ◽  
Yufan Li ◽  
Dongbin Qian ◽  
Changjie Luo ◽  
...  
Keyword(s):  
Low Energy ◽  
Velocity Map Imaging ◽  
Trapped Atoms ◽  
Ion Spectroscopy ◽  
Optically Trapped
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