Modelling surface restructuring by slow highly charged ions

Wachter, Georg; Tőkési, K.; Betz, G.; Lemell, C.; Burgdörfer, Joachim

doi:10.1016/j.nimb.2013.01.046

Cited by 3 publications

(2 citation statements)

References 32 publications

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“…Another threshold is expected to exist at still higher potential energy (higher charge state), which should correspond to a liquid-vapor phase transition (sublimation) [3]. While predicted in calculations [20] this threshold has so far not been unambiguously identified experimentally (although first indications indicate such a second threshold for CaF 2 [84]). …”

Section: Slow Highly Charged Ionsmentioning

confidence: 97%

“…(3) charge exchange and energy loss measurements are necessary [15,16], whereas determining the right side requires knowledge about the total secondary electron yield N e [17,18] and electron energy distribution E e;i [9,19] as well as yield and energy distribution of emitted X-rays. The term E surf =exc is accessible by calorimetric measurements in experiments and can eventually be extracted from simulations [9,20]. As will be discussed in Section 2.2 the term E surf =exc may partly arise from secondary electron emission towards the surface and in the sub-surface region, i.e.…”

Section: Energy Loss and Charge Exchangementioning

confidence: 99%

See 1 more Smart Citation

Highly charged ion induced nanostructures at surfaces by strong electronic excitations

Wilhelm¹,

El-Said²,

Heller³

et al. 2015

Progress in Surface Science

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a b s t r a c tNanostructure formation by single slow highly charged ion impacts can be associated with high density of electronic excitations at the impact points of the ions. Experimental results show that depending on the target material these electronic excitations may lead to very large desorption yields in the order of a few 1000 atoms per ion or the formation of nanohillocks at the impact site. Even in ultra-thin insulating membranes the formation of nanometer sized pores is observed after ion impact. In this paper, we show recent results on nanostructure formation by highly charged ions and compare them to structures and defects observed after intense electron and light ion irradiation of ionic crystals and graphene. Additional data on energy loss, charge exchange and secondary electron emission of highly charged ions clearly show that the ion charge dominates the defect formation at the surface.

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Section: Slow Highly Charged Ionsmentioning

confidence: 97%

Section: Energy Loss and Charge Exchangementioning

confidence: 99%

Highly charged ion induced nanostructures at surfaces by strong electronic excitations

Wilhelm¹,

El-Said²,

Heller³

et al. 2015

Progress in Surface Science

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show abstract

On the formation of surface nanostructures induced by slow highly charged ions

et al. 2017

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Slow highly charged ions were successfully utilized for the creation of different types of surface structures. Hillock-like nanostructures were created in most of the investigated material surfaces. Here, we report on using the plasma expansion approach to explain the main features of the nanohillocks creation on the sapphire surface irradiated by slow highly charged ions. In order to explain the creation mechanism of hillocks, we used a two dimensional axisymmetric plasma expansion model, where the plasma parameters are correlated to the hillocks shape characteristics. Our strategy is based on following the expanding plasma front, assuming that the longitudinal and transverse initial conditions are different throughout the multi-fluid plasma model. The results show that the size of the ion-induced hillock is determined by the temperature and density ratios in the ion impact region.

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Simulations of Formation of Nanostructure in Silicon Surface by Single Slow Highly Charged Ion

Zhang

et al. 2020

J. Phys.: Conf. Ser.

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To understand the mechanisms of surface erosion induced by slow highly-charged ion (SHCI) bombardment, the surface nanostructure formation in Si (111) surface by single Xe44+ ion was studied by using molecular-dynamics (MD) simulations, based on analyzing the multiple electron emission of the substrate. The time evolutions of the temperature, energy, pressure and density of the substrate have been systematically studied. The results show the bombardment of the incident SHCI resulting in an explosive event in the surface. A shock wave propagating at ~104 m/s is formed in the system during the initial 175 fs. After this initial shock, many particles are ejected from the surface since the extreme non-equilibrium of the system. And at t=370 fs, a crater-like nanostructure with diameter of ~40 Å and depth of ~18 Å is formed at the incident site.

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Modelling surface restructuring by slow highly charged ions

Cited by 3 publications

References 32 publications

Highly charged ion induced nanostructures at surfaces by strong electronic excitations

Highly charged ion induced nanostructures at surfaces by strong electronic excitations

On the formation of surface nanostructures induced by slow highly charged ions

Simulations of Formation of Nanostructure in Silicon Surface by Single Slow Highly Charged Ion

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