keV-atom bombardment of condensed rare gases: molecular dynamics simulation

Waldeer, K.T.; Urbassek, Herbert M.

doi:10.1016/0168-583x(93)96048-h

Cited by 28 publications

(13 citation statements)

References 47 publications

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“…By analyzing the emission velocity field in the cascade volume and in the vicinity of the surface, their simulations clearly demonstrate a correlated, jet-like motion of ejected particles which would be°consistent°with°a°gas°flow°model° [53]°of°the°ejection process. Comparing their visualization of impact events induced°by°1-keV°Ar°impinging°onto°solid°Ar°(Figures 1°and°5°in°reference° [52]°and° [51],°respectively)°with those induced by 15-keV C 60 impinging onto Ag{111} (Figures°2°and°1°in°references° [22]°and° [21],°respec-tively), it is probable that the nature of the emission mechanism must be similar in both cases. This notion is consistent with the fact that the kinetic energy spectrum of emitted atoms peaks at lower energies than predicted by linear cascade theory, but on the other hand cannot be fitted to a simple Maxwellian distribution.…”

Section: Velocity Spectramentioning

confidence: 99%

Energetic ion bombardment of Ag surfaces by C₆₀⁺ and Ga⁺ projectiles

Sun

Szakal

Winograd

et al. 2005

J. Am. Soc. Mass Spectrom.

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The ion bombardment-induced release of particles from a metal surface is investigated using energetic fullerene cluster ions as projectiles. The total sputter yield as well as partial yields of neutral and charged monomers and clusters leaving the surface are measured and compared with corresponding data obtained with atomic projectile ions of similar impact kinetic energy. It is found that all yields are enhanced by about one order of magnitude under bombardment with the C 60 ϩ cluster projectiles compared with Ga ϩ ions. In contrast, the electronic excitation processes determining the secondary ion formation probability are unaffected. The kinetic energy spectra of sputtered particles exhibit characteristic differences which reflect the largely different nature of the sputtering process for both types of projectiles. In particular, it is found that under C 60 ϩ impact (1) the energy spectrum of sputtered atoms peaks at significantly lower kinetic energies than for Ga ϩ bombardment and (2) the velocity spectra of monomers and dimers are virtually identical, a finding which is in pronounced contrast to all published data obtained for atomic projectiles. T he elucidation of the mechanism of interaction of energetic polyatomic or cluster ions with surfaces is of current interest since these projectiles are now being extensively employed as desorption probes in secondary ion mass spectrometry (SIMS) experiments [1,2]. Because of their propensity to produce higher molecular ion signals than corresponding atomic ions and the emergence of commercially available C 60 ϩ [3,4] and Au 3 ϩ [5, 6] ion guns, applications have expanded dramatically. For example, these sources can be focused onto the sample with a probe size about 1 micron, allowing greatly improved molecule-specific imaging experiments. The high secondary ion yield associated with the cluster/solid interaction also allows for molecular depth profiling studies without the accompanying damage accumulation normally associated with atomic bombardment [7][8][9][10][11][12][13][14][15][16][17].The mechanisms associated with the observed secondary ion yield enhancement are not yet clear, although details are emerging quickly. A basic question that must be resolved is to determine whether the yield enhancement occurs as a consequence of increased ionization efficiency, or is due to more effective sputtering in the neutral desorption channel. There is mixed information about this point. For In and Ag surfaces, for example, it has been shown that the enhanced secondary ion yield under SF m ϩ bombardment (m ϭ 1-5) largely arises from the enhanced ionization efficiency attributable to implanted F atoms [18]. For organic systems, however, very high removal rates of neutral species have been reported [2], obviating the need to invoke enhancement of the secondary ionization probability. Most recently, yields and velocity distributions were measured for In and In 2 sputtered from In surfaces bombarded with Au ϩ , Au 2 ϩ , and Au 3 ϩ [19]. Although these experiments do not ad...

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Section: Velocity Spectramentioning

confidence: 99%

Energetic ion bombardment of Ag surfaces by C₆₀⁺ and Ga⁺ projectiles

Sun

Szakal

Winograd

et al. 2005

J. Am. Soc. Mass Spectrom.

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“…Such broad distributions are typical of sputtering in general [20,21] and have been reported before for sputtering of condensed-gas targets [22]. The reason for such variation in sputter yield is shown in Fig.…”

Section: Sputter Yieldmentioning

confidence: 86%

Molecule emission from condensed Ar and O 2 targets by 750 eV Ne impact

Anders

Pędrys

Urbassek

2015

Nuclear Instruments and Methods in Physics Research Section B:

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“…If rare gas ions are desorbed via processes similar to neutral sputtering, it remains possible that the driving force for desorption of low-energy ions and cluster ions originates from the non-linear spike process. In addition, the fact that the total desorption yield by keV ion impact from rare gas solids is much larger than that estimated by the linear collision cascade theory has been attributed to enhancement in the yield of the nonlinear spike [8][9][10][11][12][13][14]. It might also be inferred that the efficient desorption of cluster ions is relevant to the non-linear spike process.…”

Section: Kinetic Energy Distributionmentioning

confidence: 99%

“…For neutral desorption from rare gas solids, the desorption mechanism has been explained by a combination of the linear and non-linear spike models [9,13,14]. If rare gas ions are desorbed via processes similar to neutral sputtering, it remains possible that the driving force for desorption of low-energy ions and cluster ions originates from the non-linear spike process.…”

Section: Kinetic Energy Distributionmentioning

confidence: 99%

Desorption of cluster ions from solid Ne by low-energy ion impact

Tachibana¹,

Fukai²,

Koizumi³

et al. 2010

J. Phys.: Condens. Matter

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Abstract. We investigated Ne+ ions and Ne + n (n = 2 − 20) cluster ions desorbed from the surface of solid Ne by 1.0 keV Ar + ion impact. Kinetic energy analysis shows a considerably narrower energy distribution for the Ne + n (n ≥ 3) ions than for the Ne + n (n = 1, 2) ions. The dependence of ion yields on Ne film thickness indicates that cluster ions (n ≥ 3) are desorbed only from relatively thick films. We conclude that desorbed ions grow into large cluster ions during the outflow of deep bulk atoms to the vacuum.

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keV-atom bombardment of condensed rare gases: molecular dynamics simulation

Cited by 28 publications

References 47 publications

Energetic ion bombardment of Ag surfaces by C₆₀⁺ and Ga⁺ projectiles

Energetic ion bombardment of Ag surfaces by C₆₀⁺ and Ga⁺ projectiles

Molecule emission from condensed Ar and O 2 targets by 750 eV Ne impact

Desorption of cluster ions from solid Ne by low-energy ion impact

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keV-atom bombardment of condensed rare gases: molecular dynamics simulation

Cited by 28 publications

References 47 publications

Energetic ion bombardment of Ag surfaces by C60+ and Ga+ projectiles

Energetic ion bombardment of Ag surfaces by C60+ and Ga+ projectiles

Molecule emission from condensed Ar and O 2 targets by 750 eV Ne impact

Desorption of cluster ions from solid Ne by low-energy ion impact

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Energetic ion bombardment of Ag surfaces by C₆₀⁺ and Ga⁺ projectiles

Energetic ion bombardment of Ag surfaces by C₆₀⁺ and Ga⁺ projectiles