Ultrafast photoelectric emission from new solid materials

Girardeau-Montaut, J.P.; Afif, M.; Tomas, Corinne; Obaton, Anne-Françoise; Girardeau-Montaut, Claire; Warda, K.

doi:10.1016/s0169-4332(96)00417-5

Cited by 10 publications

(3 citation statements)

References 19 publications

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“…Photocathodes have been prepared by different methods, namely, pulsed laser deposition [15,16], sputtering [7], ion implantation [17], arc deposition [8], friction welding [18], evaporation [19], hot isostatic pressure [20], and bulk disks press fitted [21]. The results of these investigations indicate that magnesium [9,21,22], yttrium [16,23], and lead [8,24] are very promising metallic photocathodes.…”

Section: Introductionmentioning

confidence: 99%

Highlights on photocathodes based on thin films prepared by pulsed laser deposition

Lorusso

Gontad

Perrone

et al. 2011

Phys. Rev. ST Accel. Beams

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We review the current status of metallic photocathodes based on thin films prepared by pulsed laser deposition (PLD) and we explore ways to improve the performance of these devices. PLD seems to be a very efficient and suitable technique for producing adherent and uniform thin films. Time-resolved mass spectrometric investigations definitively suggest that the deposition of high-purity metallic thin films should be carried out in ultrahigh vacuum systems and after a deep and careful laser cleaning of the target surface. Moreover, the laser cleaning of the target surface is highly recommended not only to remove the first contaminated layers but also to improve the quality of the vacuum by reducing the partial pressure of reactive chemical species as H 2 O, H 2 , and O 2 molecules. The challenge to realize high-purity Mg and Y thin films is very interesting for the photocathode R&D due to the good photoemission properties of these metals. Photocathodes based on Mg and Y thin films have been characterized by scanning electron microscopy and x-ray diffraction techniques to derive the morphological and structural features, respectively. They were also tested in a photodiode cell to deduce the photoelectron properties. The quantum efficiency of such photocathodes was systematically improved by in situ laser cleaning treatments of the surface in order to remove the contaminated layers reaching, in this way, the quantum efficiency of the corresponding bulk materials.

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Section: Introductionmentioning

confidence: 99%

Highlights on photocathodes based on thin films prepared by pulsed laser deposition

Lorusso

Gontad

Perrone

et al. 2011

Phys. Rev. ST Accel. Beams

View full text Add to dashboard Cite

show abstract

“…These boundaries are supported by experimental data. [1][2][3][4] The experiments suggest also that dimensions of K clusters in W matrix vary inside a range limited by the two extreme cluster radii observed with electronic spectroscopy, i.e., R min Ϸ5ϫ10 Ϫ10 and R min Ϸ5ϫ10 Ϫ9 m. However, among various cluster distributions versus R c which are more or less probable, we consider below only four typical distributions ͑Fig. 1͒:…”

Section: Discussionmentioning

confidence: 99%

“…The measurement of a net work function shift at the surface of implanted tungsten photocathodes [1][2][3][4] have proven the efficiency of alkali-atoms implantation in the lowering of the potential barrier at the surface of transition metals. Such a shift of potential barrier ͑up to 2 eV͒ of polycrystalline tungsten implanted by 30-110 keV K ϩ ions, cannot be explained by the assumption of single implanted atoms distributed in full statistical disorder in the tungsten matrix.…”

Section: Introductionmentioning

confidence: 99%