banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Quasi-monochromatic field-emission x-ray source
Rent this article for


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%.


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.


Article metrics loading...


Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Quasi-monochromatic field-emission x-ray source