Interaction between single dust grains and ions or electrons: laboratory measurements and their consequences for the dust dynamics

Pavlu, Jiri; Richterová, I.; Němeček, Zdenek; Šafránková, Jana; Cermak, I.

doi:10.1039/b702843a

Cited by 30 publications

(19 citation statements)

References 29 publications

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“…The electric field enhanced the sputtering yield by another factor of ≈ 2.5. Based on these results, Pavlu et al (2008) computed the life-time of grains under typical conditions in the interplanetary space and found a value of ≈ 5.10 2 years as a typical value for sputtering of a micron sized grain. The authors considered an average elemental composition of the solar wind and they have shown that heavy ions contribute to the overall sputtering yield by about one half due to their large efficiency.…”

Section: Sputtering Experimentsmentioning

confidence: 99%

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Dusty Plasma Effects in Near Earth Space and Interplanetary Medium

et al. 2011

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Dusty plasma effects in near earth space and interplanetary mediumSpace Science Reviews, 2011, Vol. 161, Issue 1-4: 1-47 10.1007/s11214-011-9762-3Access to the published version may require subscription. Published with permission from:Springer Science+Business Media B.V.Space Science Reviews manuscript No. (will be inserted by the editor) Dusty plasma effects in near Earth space and interplanetary mediumReceived: date / Accepted: date Abstract We review dust and meteoroid fluxes and their dusty plasma effects in the interplanetary medium near Earth orbit and in the Earth's ionosphere. Aside from in-situ measurements from sounding rockets and spacecraft, experimental data cover radar and optical observations of meteors. Dust plasma interactions in the interplanetary medium are observed by the detection of charged dust particles, by the detection of dust that is accelerated in the solar wind and by the detection of ions and neutrals that are released from the dust. These interactions are not well understood and lack quantitative description. There is still a huge discrepancy in the estimates of meteoroid mass deposition into the atmosphere. The radar meteor observations are of particular interest for determining this number. Dust measurements from spacecraft require a better understanding of the dust impact ionization process, as well as of the dust charging processes. The latter are also important for further studying nano dust trajectories in the solar wind. Moreover understanding of the complex dependencies that cause the variation of nano dust fluxes is still a challenge.

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Section: Sputtering Experimentsmentioning

confidence: 99%

“…Thus particles with highly curved surfaces and small particles with size comparable to the beam have enhanced yields ). For very small grain size, the beam electrons are not captured inside the grain and the surface potential can reach rather large values (e.g., Pavlu et al 2008). …”

Section: Secondary Electron Emission Experiments (See)mentioning

confidence: 99%

Dusty Plasma Effects in Near Earth Space and Interplanetary Medium

et al. 2011

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“…Other techniques provide us with absolute mass measurement, i.e., also with absolute charge of the grain. The discharging current is a first derivative of the grain charge (see [15] for details). We repeatedly applied the following sequence: Prolonged ion treatment (several hours of duration), discharging of the grain for several hours, and short (several minutes) charging and discharging were repeated several times, and eventually, a new sequence starting with the treatment was applied.…”

Section: Laboratory Experiments and Measuring Proceduresmentioning

confidence: 99%

Relation of Charging History to Field Ion Emission From Gold and Carbon Dust

Jerab

Vaverka

Vysinka

et al. 2010

IEEE Trans. Plasma Sci.

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A study of dust-grain charging plays a very important role in the understanding of complex (dusty) plasma. The dust grains are charged by several different processes (e.g., electron and ion attachments, secondary electron emission, photoemission, and field electron and ion emissions), and their charge significantly influences the surrounding plasma. Our laboratory experiment based on an electrodynamic quadrupole trap allows us to investigate some of these processes on a single isolated dust grain which can be trapped and influenced with different agents for a very long time (days). In this paper, we focused on the determination of the relation between charging conditions and the field-emission mechanism because this emission limits positive charges that dust grains can acquire due to photoemission, secondary emission, or ion attachment. The field-ion-emission process is based on the field ionization of the atoms that crosses a critical distance from the grain surface. We have found that the sources of these atoms are either the surrounding gas or the ions implanted into the grain and leaving it due to diffusion. The diffusion can be described by two time constants differing by an order of magnitude. We used two sets of dust grains: gold and amorphous carbon. The experimental results are confirmed by a simple model. Index Terms-Diffusion in solids, dust charging, field ion emission (FIE).

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“…The grain oscillation frequency is the only measurable quantity, thus we have developed several techniques to determine the grain size, mass, charge, capacitance, and other parameters. The details of the experiment as well as the description of these techniques could be found in Zilavy et al [10], Pavlu et al [11,12], Nemecek et al [13].…”

Section: Experimental Techniques and Characterization Of Lif Grainsmentioning

confidence: 99%

Auto-ionization of LiF grains

Pavlu¹,

Nouzak²,

Vysinka³

et al. 2018

AIP Conference Proceedings

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Abstract. Low-affinity materials (as MgO, CaO, LiF) are known to vary their Mie scattering profile with a changing charge. These materials are also predisposed to autoionize themselves. Although the oxides, opposite to lithium fluoride, are expected within the space environment, the presented investigations were carried out on LiF, since the aforementioned process shall be more pronounced. We are trapping a single grain in an electrodynamic quadrupole where the dust charge and its evolution can be estimated. By precise observations, we can register isolated hops of the grain charge which indicate the autoionization. A rate of this process varies with previous treatments of the object. While fresh grains exhibit one or a few hops within first 24 hours, the period between hops decreases to seconds, and the grain increases its charge by tens of elementary charges when the grains are treated by the electron beam with energy of 0.5-1 keV. On the other hand, ion treatment seems to stop the autoionization. The paper summarizes our observations and attempts to characterize the process itself.

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Interaction between single dust grains and ions or electrons: laboratory measurements and their consequences for the dust dynamics

Cited by 30 publications

References 29 publications

Dusty Plasma Effects in Near Earth Space and Interplanetary Medium

Dusty Plasma Effects in Near Earth Space and Interplanetary Medium

Relation of Charging History to Field Ion Emission From Gold and Carbon Dust

Auto-ionization of LiF grains

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