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Quasi-monochromatic field-emission x-ray source
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10.1063/1.4752406
/content/aip/journal/rsi/83/9/10.1063/1.4752406
http://aip.metastore.ingenta.com/content/aip/journal/rsi/83/9/10.1063/1.4752406

Figures

Image of FIG. 1.
FIG. 1.

X-ray emission energy of the characteristic L- and K-shell lines for Cu and Mo (left side) and the transitions that give rise to the emission lines (right side) (from Ref. 26).

Image of FIG. 2.
FIG. 2.

Mo-anode x-ray spectra produced by an electron energy impact of 26 keV. With and without 30-μm Mo K-edge filtering.13

Image of FIG. 3.
FIG. 3.

Experimental arrangement of the FE x-ray setup. (a) Target chamber. (b) Details of the FE gun.

Image of FIG. 4.
FIG. 4.

Carbon nanopearl tip. (a) The carbon nanopearl (CNP) tip is obtained by covering a metallic tip with a layer of carbon nanopearls. (b) Carbon nanopearl emitter surface. (c) A field emission gun-SEM close view of carbon nanopearls. The carbon nanosphere diameter is ∼100 nm. (d) HRTEM image of the surface of a nanopearl. The orientation of the fringes and the FFT near the surface (inset) indicated a concentric disposition of wavy nanoflakes.

Image of FIG. 5.
FIG. 5.

FE characteristics of CNP-FE cathode within 10−6–10−7 Torr. (a) I–V characteristics; in the inset, the linear dependence of ln(I/V 2) vs 1/V indicates a Fowler-Nordheim behavior for the FE. (b) Stability of the FE currents for intervals of time of 15–25 min; samples of stable FE currents measured for total durations more than 200 h.

Image of FIG. 6.
FIG. 6.

X-ray spectra for Mo counter-anode and for e-impact energies between 5 and 14 keV for (a) absolute counts and (b) normalized counts.

Image of FIG. 7.
FIG. 7.

Mo L-peak monochromaticity and intensity in function of E e , for the same FE current of 5.5 μA. The solid (blue) line for the L-peak intensity is a curve fitting with a function proportional to ((E e /2.52 keV) – 1)1.67.

Image of FIG. 8.
FIG. 8.

Evolution of the Mo L-peak for E e constant vs. 3 different e-beam currents. The centroïd of the peaks is pinned at 2.32 keV with an M value ∼71%.

Tables

Generic image for table
Table I.

Outermost L-shell emission lines26 and assumed centroïd of the merged L-peak with minimum values for the FWHM for different counter-anode materials. λ is the wavelength corresponding to the L-peak.

Generic image for table
Table II.

L-shell emission lines26 and the assumed centroïds corresponding to two distinct L α -peak and L β -peak, for different counter-anode materials. λ is the wavelength corresponding to the L-peak.

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/content/aip/journal/rsi/83/9/10.1063/1.4752406
2012-09-25
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Quasi-monochromatic field-emission x-ray source
http://aip.metastore.ingenta.com/content/aip/journal/rsi/83/9/10.1063/1.4752406
10.1063/1.4752406
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