Excitation of Li(2p) in slow collisions of Li+ ions with cesiated W(110) surfaces

Schall, H.; Huber, W.; Hoermann, H.; Maus‐Friedrichs, W.; Kempter, V.

doi:10.1016/0039-6028(89)90109-x

Cited by 51 publications

(19 citation statements)

References 9 publications

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“…Details of the apparatus can be found elsewhere, 8,9 as well as details concerning the preparation of the LiF film. 10,11 A mass analyzed H ϩ beam impinges on a W͑110͒ surface covered by a LiF film.…”

Section: Methodsmentioning

confidence: 99%

Electron promotion in collisions of protons with a LiF surface

et al. 1999

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Section: Methodsmentioning

confidence: 99%

Electron promotion in collisions of protons with a LiF surface

et al. 1999

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“…The apparatus was documented on several occasions [20,21]. Inert gas ions (He +, Ne +, Ar +, Xe +) ions are formed in a low-voltage plasma discharge source capable to produce ion current densities of the order of 10 -7 A/nlIn 2 at the W(110) single crystal at 100 eV beam energy.…”

Section: Methodsmentioning

confidence: 99%

“…It impinges grazingly upon a W(110) crystal oriented with the [001] direction along the beam direction and held at room temperature during the measurements. The procedure for cleaning the W(100) crystals is described in [20]. Alkali atoms (Cs) are offered to the surface by means of SAES Getters Inc. dispenser sources.…”

Section: Methodsmentioning

confidence: 99%

Electron emission in collisions of slow rare gas ions with partially cesiated W (110)

Müller¹,

Hausmann²,

Brenten³

et al. 1993

Z Phys D - Atoms, Molecules and Clusters

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Abstract.We report the spectra of electrons emitted after slow collisions (50 eV) of rare gas ions (He +, Ne +, Ar +, and Xe +) with partially cesiated W(ll0) surfaces. The electron spectra are discussed in terms of the two interatomic Auger processes, Auger Capture and Auger Deexcitation and the intra-atomic Auger process, Autodetachment of Rg-* (He-*(1 s 2s 2 28) in the case of He). Model calculations including these processes can qualitatively reproduce the measured spectra as well as experimental values for the electron emission coefficients, 7. This is demonstrated for collisions of He + ions and thermal metastable He atoms with clean and partially cesiated W(110).

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“…We assume that the remainder of the detected light is due to transitions of higher excited states of Li. This assumption is supported by measurements of Andersson, 21 and also by the measurements of Schall et al 4 To measure the relative yield of Li 0 (2p), we used the following experimental sequence. The sample was prepared in the upper tier of the chamber by cleaning it and then depositing varying amounts of alkali; the resulting work function change ⌬ was then measured.…”

Section: B Detectorsmentioning

confidence: 79%

“…This is because the incident Li ϩ ions can now strike adsorbates which may block those portions of the unit cell which would otherwise lead to implantation of the impinging ion. ͑If an extremely grazing scattering geometry can be utilized, as by Kempter et al, 4 this effect is greatly reduced since most of the particles are reflected. For the experiments presented in this paper, we chose the incident angle to reduce the range of final velocities of the particles as much as possible without producing a false signal from collisions with other surfaces such as the tantalum retaining ring holding the sample in place͒.…”

Section: B Detectorsmentioning

confidence: 99%

Charge transfer in hyperthermal energy collisions ofLi+with alkali-metal-covered Cu(001). II. Dynamics of excited-state formation

et al. 1996

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We have measured the relative probability of excited state ͓Li 0 (2p)͔ formation versus the work-function change induced by alkali-metal adsorbates when hyperthermal energy Li ϩ ions are incident on alkali-metalcovered Cu͑001͒. This probability is broadly peaked as the work function decreases, and decreases by approximately an order of magnitude when the velocity of the ions in the incident beam is decreased from 1.05ϫ10 5 to 0.52ϫ10 5 m s Ϫ1 , and the incident angle is i ϭ65°as measured from the surface normal. Theoretical calculations based on a many-body solution to the time-dependent Anderson-Newns model of charge transfer ͑discussed in the preceding paper͒ qualitatively reproduce the observed trends. These calculations suggest that the peak in the excited-state probability results mainly from two effects: first, the decreasing difference between the energy of the Li 0 (2p) state and the Fermi level as the work function decreases, which tends to increase the excited-state probability; and second, the competition of the Li 0 (2p) state with the Li Ϫ (2s 2 ) negative ion state at low work functions, which tends to decrease the excited-state probability. Differences between the Li 0 (2s) and Li 0 (2p) lifetimes also play a role in the formation of the peak, as does electron-hole pair production.

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Excitation of Li(2p) in slow collisions of Li+ ions with cesiated W(110) surfaces

Cited by 51 publications

References 9 publications

Electron promotion in collisions of protons with a LiF surface

Electron promotion in collisions of protons with a LiF surface

Electron emission in collisions of slow rare gas ions with partially cesiated W (110)

Charge transfer in hyperthermal energy collisions ofLi+with alkali-metal-covered Cu(001). II. Dynamics of excited-state formation

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