Alkali-metal oxides. I. Molecular and crystal-field effects in photoemission

Bertel, E.; Netzer, F.P.; Rosina, G.; Saalfeld, H.

doi:10.1103/physrevb.39.6082

Cited by 52 publications

(18 citation statements)

References 16 publications

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“…The illdefined structure below the 0 2p peak develops upon further exposure into a spectrum with multiple peaks (Figure 11 and refs [12][13][14][17][18][19]. This spectrum is a fingerprint of molecular adsorption.…”

Section: High Exposures At Lowmentioning

confidence: 99%

Oxygen Adsorption on Potassium

Shao¹,

Paul²

1994

J. Phys. Chem.

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Quantum chemical calculations of oxygen adsorption on potassium are presented. The surface was modeled by clusters of six atoms and the electronic structure evaluated in the Hartree-Fock and Hartree-FockSlater schemes. Adsorbed intermediates were identified by comparisons between calculated data and spectroscopic information, mainly from photoemission and vibrational spectroscopies. Low doses of oxygen at cryogenic temperatures lead to the formation of surface 0-and higher doses to subsurface 0 2 -. The 0 2 -species dissociate to bulk 0-upon gentle annealing. Further annealing initiates the formation of a threedimensional oxide. Lattice relaxation is critical to the understanding of atomic adsorption as well as molecular orientation.

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Section: High Exposures At Lowmentioning

confidence: 99%

Oxygen Adsorption on Potassium

Shao¹,

Paul²

1994

J. Phys. Chem.

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“…It is discovered in our earlier studies that there are two types of Cs oxides in the activation layer after the InP is activated by Cs and oxygen [15], where the identification of Cs peroxide and superoxide is based on comparing the valence band spectra of our activated InP photocathode with the well established literature of oxidation of bulk Cs [16][17][18][19][20][21][22][23]. The QE of an activated InP photocathode decays in our vacuum system, accompanied by changes in both the O1s and VB spectra [15].…”

Section: A Angle-dependent Photoemission Measurementsmentioning

confidence: 99%

The distribution of oxide species in the Cs∕O activation layer on InP(100) negative electron affinity photocathodes

Lee

Sun

Liu

et al. 2007

Journal of Applied Physics

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Abstract:The atomic arrangement of Cs oxides in the activation layer of an InP photocathode is investigated using Angle Dependent Photoemission Spectroscopy (ADPES). Two distinct peaks in the O1s core level and in valence band spectra have led to the discovery of two molecular oxygen species incorporated in the thin activation layer: Cs peroxide (Cs 2 O 2 ) and Cs superoxide SLAC-PUB-12711Submitted to Journal of Applied Physics 2 observation of the peak evolution in the photoemission spectra, and supported by the thermodynamic stability of Cs superoxide as compared to Cs peroxide when there is residual oxygen around.3

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“…There is no indication of un-oxidised metal in the EMS data, and the sodium oxide EMS spectra have a single, broad feature due to the O 2p states, indicating the presence of atomic, rather than molecular oxygen 1,3,5 .…”

Section: B Sample Preparationmentioning

confidence: 99%

“…Despite this, there are virtually no measurements reported in the literature of the complete band structures, and indeed, very few measurements at all for the Group I oxides. Ultraviolet (UPS) and x-ray photoemission spectroscopy (XPS) have been used to probe oxidation of Li [1][2][3] , Na 4,5 or K 1,3,5,6 and the absorption of oxygen onto potassium covered surfaces of Pt, Fe and ZrC 7 . The core levels have been measured in electron emission by Barrie and Street 8 , and only recently densities of states in the valence and core regions of Li 2 O have been reported by Tanaka et al 9 and Liu et al 10 using XPS and UPS.…”

Section: Introductionmentioning

confidence: 99%