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Vacuum space charge effect in laser-based solid-state photoemission spectroscopy
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10.1063/1.3273487
/content/aip/journal/jap/107/1/10.1063/1.3273487
http://aip.metastore.ingenta.com/content/aip/journal/jap/107/1/10.1063/1.3273487

Figures

Image of FIG. 1.
FIG. 1.

Laser-ARPES experimental setup. The focal lengths are , , and .

Image of FIG. 2.
FIG. 2.

Spot size measurements. (a) Photoelectron yield as a function of laser power. (b) Typical and scans of the integrated photoemission intensity from the W mesh. The scan is vertically shifted.

Image of FIG. 3.
FIG. 3.

Fermi edge of the Au sample as a function of the number of photoelectrons per pulse . The spectra are normalized and shifted vertically. The solid lines are fits.

Image of FIG. 4.
FIG. 4.

Space charge effect as a function of the number of electrons per pulse for various spot diameters . (a) Broadening of the Fermi edge as a function of and . The dashed line shows a linear fit and the dotted line a fit to the triangular markers. (b) Shift of the Fermi edge as a function of for various values of . The dashed lines show a linear fit of the triangular markers. The solid lines are fits to a power law. The data set with diamond shaped markers was obtained at the ALS with 35 eV photon energy and was adapted from Ref. 9. The y-axis error bars include the errors on the fit and the instrumental resolutions. The x-axis error bar is estimated from the sample current measurement resolution. The spectra are averaged over along the analyzer slit with .

Image of FIG. 5.
FIG. 5.

Plot of the fitting coefficients and as a function of . The solid lines in panel (a) show the average value of and . The solid and dashed lines in panel (b) are fits to a power law.

Image of FIG. 6.
FIG. 6.

(a) and as a function of the emission angle . and are estimated from the fit of the angle-integrated spectrum. (b) Photoemission intensity as a function of . The solid lines are fits with the function .

Image of FIG. 7.
FIG. 7.

Simulation of the space charge effect. (a) and (b) as a function of for various values. The error bars result from multiple simulation runs and represent the standard deviations. The solid lines are fits to a power law.

Image of FIG. 8.
FIG. 8.

Simulation of the space charge effect. (a) and (b) as a function of for various values. The error bars result from multiple simulation runs and represent the standard deviations. The solid lines are fits to a power law.

Tables

Generic image for table
Table I.

Summary of the measured and simulated exponent values.

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/content/aip/journal/jap/107/1/10.1063/1.3273487
2010-01-12
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Vacuum space charge effect in laser-based solid-state photoemission spectroscopy
http://aip.metastore.ingenta.com/content/aip/journal/jap/107/1/10.1063/1.3273487
10.1063/1.3273487
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