Investigations of Photoemission From Lunar Dust Simulant

Nouzak, Libor; Richterová, I.; Pavlu, Jiri; Němeček, Zdenek; Šafránková, Jana

doi:10.1109/tps.2015.2493885

Cited by 5 publications

(5 citation statements)

References 23 publications

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“…To characterize the LMS-1 simulant further, we measured the work function and the thermal optical properties of the simulant (Table 3). The measured value of the WF of LMS-1 simulant is close to the averaged measurements results for WF of other Lunar dust simulants in [42,43]. The thermo-optical characteristics of LMS-1, as measured by our in-house method, are a little bit lower, but close enough to the values of real Lunar mare soil samples, presented in [44].…”

Section: Selection Of Lunar Dust Simulantsupporting

confidence: 85%

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Regolith adherence characterization (RAC) experiment on the Moon and it’s ground-based simulation: Materials Issues

Kleiman

Iskanderova

Krishtein³

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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The interaction of Lunar dust and other environmental factors, like vacuum, temperatures, solar radiation, ultraviolet irradiation, and electron (e-) and proton (p+) irradiation with structures on the Moon and the outside of the future Gateway Lunar station may lead to permanent change or complete loss of thermal, optical, and other functionalities that could potentially lead to catastrophic failures. Among these factors, Lunar regolith dust is the most aggressive, causing the main problems. ITL recently initiated a program to evaluate, further develop, and enhance its unique cornerstone Lunar Dust Mitigation Technology (DMT) for sensitive materials on external space structures. In the framework of this program, ITL prepared a set of DMT-treated samples for inclusion in the “Regolith Adherence Characterization (RAC) Payload” funded by NASA and developed and built by Aegis. Regolith Adherence Characterization (RAC) Payload mission will determine how lunar regolith dust sticks to a range of space materials and coatings (collected from NASA, academia, and industry) exposed to the Moon’s environment at different phases of flight caused by 1) landing, and 2) during routine lander operations. To understand the results of the Lunar exposure experiment, an extensive program was initiated at ITL where a set of experiments on interaction of Lunar dust simulants with samples, similar to the RAC Payload experiments on the Moon, will be conducted in ITL’s Vacuum Lunar Dusty Environment Simulator that will be upgraded for this project. This paper will discuss mainly the material problems and their preparation for experiments. The detailed description of the Vacuum Lunar Dusty Environment Simulator and the results obtained in it will be published elsewhere in upcoming publications.

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Section: Selection Of Lunar Dust Simulantsupporting

confidence: 85%

“…For the ground-based RAC experiments, we selected a sample with WF ~ 5.5 eV, since the WF of the LMS-1 Lunar mare dust simulant has been found to be WF~ 5.52 eV. (Examples of WF measurements for previously used Lunar dust simulants can be found in [42,43].…”

Section: Selection and Development Of Materials And Characterization ...mentioning

confidence: 99%

Regolith adherence characterization (RAC) experiment on the Moon and it’s ground-based simulation: Materials Issues

Kleiman

Iskanderova

Krishtein³

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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“…The work function of chromium is about 4.5 eV, and the work function of glass is about 4.7 eV. 42,43 When imaged with KFPM, we found that the CPD of the chromium metal is larger than that of the background glass, i.e., the area with a larger work function will exhibit a lower CPD in our potential map. Based on the data analysis, we deduce that the work function of the lower CPD region in the HOPG potential map will be larger than that of graphite.…”

Section: ■ Results and Discussionmentioning

confidence: 78%

Influence of Atmospheric Contaminants on the Work Function of Graphite

et al. 2023

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Airborne hydrocarbon contamination occurs rapidly on graphitic surfaces and negatively impact many of their material properties, yet much of the molecular details of the contamination remains unknown. We use Kelvin probe force microscopy (KPFM) to study the time evolution of the surface potential of graphite exposed to ambient. After exfoliation in air, the surface potential of graphite is not homogeneous and contains features that are absent in the topography image. In addition, the heterogeneity of the surface potential images increased in the first few days followed by a decrease at longer exposure times. These observations are strong support of slow conformation change, phase separation, and/or dynamic displacement of the adsorbed airborne contaminants.

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“…The grain oscillation frequency is the only measurable quantity, and we have developed several techniques to determine the grain mass, charge, capacitance, and other parameters (Pavlůet al 2004). The grain charge-to-mass ratio is computed from its oscillation frequency that is determined from the grain projection onto a position-sensitive detector (Nouzák et al 2016). The method is sensitive enough to quantify the change of the charge caused by one elementary charge (Žilavý et al 1999;Pavlůet al 2004) and it allows us to estimate also the mass of a trapped grain.…”

Section: Methodsmentioning

confidence: 99%

“…The electrostatic force resulting from charging/discharging of the interstellar dust grains by the interaction with photons and charged particles of cosmic radiation (CR) is an important process for a dust cloud evolution. The UV photoemission charging is broadly studied and leads to charging of grains to low positive potentials (e.g., Nouzák et al 2016), and thus we concentrate on the charging by massive particles.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Simulation of the Positron–Dust Interaction and its Implication for Interstellar Dark Clouds

Wild

Čı́žek

Nouzak

et al. 2023

ApJ

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We report the first laboratory experiment dealing with the interaction of a cosmic dust simulant with positrons emitted from a 22Na radioisotope. Measurements of a charge of micrometer SiO2 dust grains with an accuracy of one elementary charge e revealed +1 e steps due to positron annihilation inside the grain. The observed average rate of these charging events agrees well with prediction of a model based on the continuous slowing down approximation of energetic of positrons inside the grain. Less frequent charge steps larger than +1 e were attributed to emission of secondary electrons during positron slowing down. The determined coefficient of secondary electron emission is approximately inversely proportional to the grain radius. The experimental results led us to the formulation of a possible scenario of interstellar dark clouds charging.

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Investigations of Photoemission From Lunar Dust Simulant

Cited by 5 publications

References 23 publications

Regolith adherence characterization (RAC) experiment on the Moon and it’s ground-based simulation: Materials Issues

Regolith adherence characterization (RAC) experiment on the Moon and it’s ground-based simulation: Materials Issues

Influence of Atmospheric Contaminants on the Work Function of Graphite

Laboratory Simulation of the Positron–Dust Interaction and its Implication for Interstellar Dark Clouds

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