Angular, energy, and population distributions of neutral atoms desorbed by keV ion beam bombardment of Ni{001}

Chun He, S. W. Rosencrance, Z. Postawa, C. Xu, R. Chatterjee, D. E. Riederer, Barbara Jane Garrison, Nicholas Winograd

Research output: Contribution to journalArticle

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Abstract

Multi-photon resonance ionization, time-of-flight mass spectrometry and imaging techniques have been employed to measure the polar-angle, kinetic energy, and population distributions of Ni atoms desorbed from 5 keV Ar ion bombarded Ni{001}. The measured angle- and energy-resolved intensity maps of the sputtering yield provide a set of data that can be used to examine the detailed interactions between the particles of the solid surface during the sputtering event. The results show a considerable degree of anisotropy associated with both the ejection angle as well as the crystallographic direction. In order to have an understanding of the interactions of the desorbed particles with the surface, molecular dynamics simulations of the ion-induced sputtering event are performed. The agreement between experimental and computer simulation results is excellent. Measurements performed on excited states of sputtered Ni show that the valence electron shell structure is an important factor in determining the angle-integrated kinetic energy distribution while the magnitude of the excitation energy is of secondary importance. Population distribution among different electronic states is obtained through two sets of measurements performed on different instruments. Both measurements employ the same resonant ionization schemes and laser fluences. The results show that the a3D3 and a3D2 states are more heavily populated than is predicted by a Boltzmann-type distribution.

Original languageEnglish (US)
Pages (from-to)209-212
Number of pages4
JournalNuclear Inst. and Methods in Physics Research, B
Volume100
Issue number2-3
DOIs
StatePublished - Jun 1 1995

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Population distribution
neutral atoms
Ion beams
Sputtering
bombardment
energy distribution
angular distribution
ion beams
Kinetic energy
Atoms
Ionization
sputtering
Excitation energy
kinetic energy
Computer simulation
Ions
Electronic states
Excited states
ionization
Mass spectrometry

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation

Cite this

He, Chun ; Rosencrance, S. W. ; Postawa, Z. ; Xu, C. ; Chatterjee, R. ; Riederer, D. E. ; Garrison, Barbara Jane ; Winograd, Nicholas. / Angular, energy, and population distributions of neutral atoms desorbed by keV ion beam bombardment of Ni{001}. In: Nuclear Inst. and Methods in Physics Research, B. 1995 ; Vol. 100, No. 2-3. pp. 209-212.
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Angular, energy, and population distributions of neutral atoms desorbed by keV ion beam bombardment of Ni{001}. / He, Chun; Rosencrance, S. W.; Postawa, Z.; Xu, C.; Chatterjee, R.; Riederer, D. E.; Garrison, Barbara Jane; Winograd, Nicholas.

In: Nuclear Inst. and Methods in Physics Research, B, Vol. 100, No. 2-3, 01.06.1995, p. 209-212.

Research output: Contribution to journalArticle

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AU - He, Chun

AU - Rosencrance, S. W.

AU - Postawa, Z.

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AU - Chatterjee, R.

AU - Riederer, D. E.

AU - Garrison, Barbara Jane

AU - Winograd, Nicholas

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N2 - Multi-photon resonance ionization, time-of-flight mass spectrometry and imaging techniques have been employed to measure the polar-angle, kinetic energy, and population distributions of Ni atoms desorbed from 5 keV Ar ion bombarded Ni{001}. The measured angle- and energy-resolved intensity maps of the sputtering yield provide a set of data that can be used to examine the detailed interactions between the particles of the solid surface during the sputtering event. The results show a considerable degree of anisotropy associated with both the ejection angle as well as the crystallographic direction. In order to have an understanding of the interactions of the desorbed particles with the surface, molecular dynamics simulations of the ion-induced sputtering event are performed. The agreement between experimental and computer simulation results is excellent. Measurements performed on excited states of sputtered Ni show that the valence electron shell structure is an important factor in determining the angle-integrated kinetic energy distribution while the magnitude of the excitation energy is of secondary importance. Population distribution among different electronic states is obtained through two sets of measurements performed on different instruments. Both measurements employ the same resonant ionization schemes and laser fluences. The results show that the a3D3 and a3D2 states are more heavily populated than is predicted by a Boltzmann-type distribution.

AB - Multi-photon resonance ionization, time-of-flight mass spectrometry and imaging techniques have been employed to measure the polar-angle, kinetic energy, and population distributions of Ni atoms desorbed from 5 keV Ar ion bombarded Ni{001}. The measured angle- and energy-resolved intensity maps of the sputtering yield provide a set of data that can be used to examine the detailed interactions between the particles of the solid surface during the sputtering event. The results show a considerable degree of anisotropy associated with both the ejection angle as well as the crystallographic direction. In order to have an understanding of the interactions of the desorbed particles with the surface, molecular dynamics simulations of the ion-induced sputtering event are performed. The agreement between experimental and computer simulation results is excellent. Measurements performed on excited states of sputtered Ni show that the valence electron shell structure is an important factor in determining the angle-integrated kinetic energy distribution while the magnitude of the excitation energy is of secondary importance. Population distribution among different electronic states is obtained through two sets of measurements performed on different instruments. Both measurements employ the same resonant ionization schemes and laser fluences. The results show that the a3D3 and a3D2 states are more heavily populated than is predicted by a Boltzmann-type distribution.

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