Interaction of cesium and oxygen on W(110)

Papageorgopoulos, C.A.; Desplat, J.‐L.

doi:10.1016/0039-6028(80)90247-2

Cited by 35 publications

(6 citation statements)

References 14 publications

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“…This behavior is almost the same as that observed during the interaction of other electronegative elements (O 2 ) with adsorbed alkali on metallic and semiconducting surfaces. 39,40 Figure 8 shows the SiCl desorption spectra after Cl deposition on Na(1 ML)-covered Si(100). It also shows a desorption spectrum of SiCl 2 and SiCl 3 compounds for Θ Na = 1 ML and Θ Cl > 1 ML.…”

Section: Na and CL 2 Coadsorption Onmentioning

confidence: 99%

SODIUM AND CHLORINE COADSORPTION ON Si(100)

Kamaratos

Papageorgopoulos

2001

Surf. Rev. Lett.

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In this paper we study the adsorption of molecular chlorine on the Si(100)(2 × 1) surface and its interaction with sodium at room and elevated temperature in an ultrahigh vacuum. Cl is deposited dissociatively on the surface and forms SiCl2 and SiCl4. During Na deposition on the Cl-covered Si(100) surface, the substrate participates to a NaSiCl2 compound formation, whereas Cl deposition on Na-covered Si(100) leads to NaCl formation, which is grown with the (100) plane parallel to the surface. After the completion of the NaCl formation, the excess Cl interacts with the substrate and forms Si-Cl compounds. The presence of Na on the surface prevents partly the chlorination of Si, depending on the amount of Na. At elevated temperatures, the NaCl dissociates according to the equation 2NaCl + Si → Na2Cl + SiCl and desorbs. 261 Surf. Rev. Lett. 2001.08:261-269. Downloaded from www.worldscientific.com by PENNSYLVANIA STATE UNIVERSITY on 03/15/15. For personal use only.

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Section: Na and CL 2 Coadsorption Onmentioning

confidence: 99%

SODIUM AND CHLORINE COADSORPTION ON Si(100)

Kamaratos

Papageorgopoulos

2001

Surf. Rev. Lett.

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“…Nous avons observé que le pic Ag (352 eV) était atténué au maximum de 10 %. Si l'on admet [25] que le libre parcours inélastique d'électrons de 350 eV dans Cs est 1 ~ 1 nm, l'épaisseur moyenne calculée d serait voisine de 0,1 nm, valeur inférieure à dm. On peut donc penser que le recouvrement en Cs n'est pas uniforme sur nos surfaces polycristallines d'argent, et qu'il existe des zones où les atomes de Cs ne peuvent se fixer.…”

Section: Emission Renforcée Par Excitation D'ondesunclassified

Stabilité de l'émission photoélectrique de couches minces d'argent recouvertes de césium oxydé

Gautreau¹,

Septier²

1984

Rev. Phys. Appl. (Paris)

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2014 Par une série de cycles alternés d'évaporation de Cs suivie d'une introduction contrôlée d'oxygène dans l'enceinte ultravide, on forme une mince couche Cs-O qui abaisse le travail de sortie de Ag polycristallin aux environs de 1 eV. Mais le seuil photoélectrique 03BBs ~ 1,2 03BCm ainsi obtenu n'est pas stable, et se déplace lentement vers les plus courtes longueurs d'onde. Toutefois, les valeurs du seuil initial et de la sensibilité spectrale S(03BB) de la photocathode peuvent être réobtenues aisément par introduction dans l'enceinte à ultravide d'une très faible quantité d'oxygène. Des analyses Auger de la couche superficielle Cs-O ont permis de montrer que cette couche est formée d'atomes adsorbés et non d'oxyde de Cs, que son épaisseur est de l'ordre de la monocouche, et que la variation des pics relatifs à Cs et O pendant le vieillissement, correspond à un appauvrissement en oxygène qui peut être compensé par régénération. Abstract. 2014 Controlled oxidation of successive Cs layers evaporated in sequence onto a polycristallin Ag surface decreases the work function down to 1 eV. Unfortunately, the corresponding wavelength threshold 03BBs ~ 1.2 03BCm is not stable and moves slowly towards lower values. However initial threshold and spectral sensitivity S(03BB) values can be fully recovered by injecting a tiny amount of oxygen in the UHV chamber. AES studies, performed with new, aged and regenerated Cs-oxide layers respectively, allowed to detect very small variations in the oxygen concentration and to show that the Cs-O layer is not made of Cs-oxide but of Cs and O adsorbed atoms, with a thickness corresponding to about one monolayer.

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“…Various studies on the structural properties of such co-adsorptions have been performed on W(100) (Desplats 1974), W(110) (Papageorgopoulos and Desplats 1980), nickel (Papageorgopoulos and Chen 1975), silver (Marbrow and Lambert 1976), and iron (Pirug et a1 1980). The electronic properties have been determined for only a few systems; O&s/ Ni( 100) (Papageorgopoulos and Desplats 1980), Oz/Cs/Ni( 100) (Surnev et a1 19Sl), 02/K/Fe(110) (Pirug et a1 1980) and 02/Cs and Na on Cu(ll1) (Lindgren and Wallden 1980).…”

Section: Introductionmentioning

confidence: 99%

“…The electronic properties have been determined for only a few systems; O&s/ Ni( 100) (Papageorgopoulos and Desplats 1980), Oz/Cs/Ni( 100) (Surnev et a1 19Sl), 02/K/Fe(110) (Pirug et a1 1980) and 02/Cs and Na on Cu(ll1) (Lindgren and Wallden 1980). This last system was studied by angular-resolved photoemission and by electron-loss spectroscopy (ELS).…”

Section: Introductionmentioning

confidence: 99%

Miniature active elements for color-center lasers with an extremely low lasing threshold

Мартынович¹,

Baryshnikov²,

Grigorov³

et al. 1988

Sov. J. Quantum Electron.

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Room-temperature co-adsorption of Cs and O2 on Mo(100) is studied by ELS, UPS and work function changes. We use a constant amount of caesium (4.3 x lOI4 atoms cm-') which corresponds to a monolayer on clean Mo(100).The loss peak at 1.65 eV observed for the Cs monolayer disappears for an oxygen exposure 2 of 0.28 L (Langmuir) and is replaced by a loss peak at 1.2 eV. Both losses are attributed to interband transitions.Above 2 L several 0 2 p states are observed in UPS, indicating that 0 is bonded to the substrate and to the Cs. These spectradiffersignificantlyfrom thoseobtained forcsdeposited on an MO surface with various oxygen coverages.The differences observed with respect to Cs on Cu(ll1) are attributed to a substrate effect.

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Interaction of cesium and oxygen on W(110)

Cited by 35 publications

References 14 publications

SODIUM AND CHLORINE COADSORPTION ON Si(100)

SODIUM AND CHLORINE COADSORPTION ON Si(100)

Stabilité de l'émission photoélectrique de couches minces d'argent recouvertes de césium oxydé

Miniature active elements for color-center lasers with an extremely low lasing threshold

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