Characteristics of charge and discharge of PMMA samples due to electron irradiation

Feng, Guobao; Fang, Wanliang; Hu, Taotao; Cao, Meng

doi:10.1088/1674-1056/24/11/117901

Cited by 8 publications

(4 citation statements)

References 36 publications

(46 reference statements)

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“…Apart from variation of direction, the energy of electron will transform during the inelastic scattering. [24,25] Here we can use the continuous slowing down approximation (CSDA) method to calculate the energy loss in each step. The energy loss dE/dS can be calculated by Bethe mode,…”

Section: Physical Calculation Modelmentioning

confidence: 99%

Electron beam irradiation on novel coronavirus (COVID-19): A Monte–Carlo simulation*

Feng¹,

Liu²,

Cui³

et al. 2020

Chinese Phys. B

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The novel coronavirus pneumonia triggered by COVID-19 is now raging the whole world. As a rapid and reliable killing COVID-19 method in industry, electron beam irradiation can interact with virus molecules and destroy their activity. With the unexpected appearance and quickly spreading of the virus, it is urgently necessary to figure out the mechanism of electron beam irradiation on COVID-19. In this study, we establish a virus structure and molecule model based on the detected gene sequence of Wuhan patient, and calculate irradiated electron interaction with virus atoms via a Monte Carlo simulation that track each elastic and inelastic collision of all electrons. The characteristics of irradiation damage on COVID-19, atoms’ ionizations and electron energy losses are calculated and analyzed with regions. We simulate the different situations of incident electron energy for evaluating the influence of incident energy on virus damage. It is found that under the major protecting of an envelope protein layer, the inner RNA suffers the minimal damage. The damage for a ∼100-nm-diameter virus molecule is not always enhanced by irradiation energy monotonicity, for COVID-19, the irradiation electron energy of the strongest energy loss damage is 2 keV.

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Section: Physical Calculation Modelmentioning

confidence: 99%

Electron beam irradiation on novel coronavirus (COVID-19): A Monte–Carlo simulation*

Feng¹,

Liu²,

Cui³

et al. 2020

Chinese Phys. B

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“…The electron yield of polymer thin films with ∼µm thickness is far less than 1 under high‐energy e‐beam irradiation. Therefore, excess electrons by inelastic scattering will be deposited inside the film forming the negative charge distribution 21–23 . However, the penetration range of e‐beam with beam energy >10 kV is larger than, or comparable with, the thickness of PMMA, and thereby some incident electrons may penetrate the film.…”

Section: Introductionmentioning

confidence: 99%

Self‐consistent charging of PMMA thin film induced by a penetrating electron beam in electron microscopy

Qian²

2021

Journal of Microscopy

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The charging of the polymer thin film irradiated by penetrating electron beam (e‐beam) is investigated, in parallel with the numerical simulation and experiment. The simulation is performed by combining scattering, drift, diffusion, trapping and recombination. Results show that, due to the electron emission the net charge near the surface is distribution positively, but negatively inside the film because of low electron mobility. The surface potential is positive near surface and accordingly forces some of secondary electrons to return surface. As irradiation proceeds, currents flowing into and out of the film can tend to equilibrium. In the equilibrium state, with increasing beam energy, the surface potential and the efficient emission current decrease, and the electron beam‐induced current and the transmission current tend to zero and the beam current valuable, respectively. E‐beams of 10‐30 keV cause positive charging on PMMA film of 2 µm, which means the high‐energy e‐beam can effectively discharge a thin film that has been charged negatively by irradiation with low‐energy e‐beam. With the increase of the film thickness from 1 to 3 µm, the positive surface potential and the emission current decreases and increases, respectively, and the transmission current tends to zero.

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“…They found that the accumulated electron in the bulk drifts toward the irradiation surface due to high conductivity and high electric field [9]. Feng et al thought that internal free electrons will run off to the ground in the form of leakage current due to charge diffusion and drift during the discharge process after irradiation, while trapped electrons remain undisturbed [10]. The accumulation of trapped charges establishes an internal electric field, affecting the injected electrons trajectories and charging energy loss.…”

Section: Introductionmentioning

confidence: 99%

The effect of temperature on charging behaviour of polyimide subjected to electron beam at vacuum

Qin¹,

Tu²,

Xu³

et al. 2021

J. Phys. D: Appl. Phys.

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Charge accumulation is one of the main factors leading to electrostatic discharge and restricting the development of spacecraft. This paper investigates the effect of temperature (243-343 K) on the charging behaviour of polyimide in vacuum using electron beam radiation test system. The surface potential distribution shows that there are two charging modes, 'negative-peak' mode and 'negative-crater' mode. For investigating the charge accumulation mechanism, the space charge experiments were carried out by the method of pulsed electro-acoustic. The thresholds of injection from the polyimide/electrode interface are affected by temperature. Under high temperature (above 323 K), the hole could be easily injected from the polyimide/electrode interface, with the extremely low injection threshold. The incident electrons and the injected holes co-existence and form the 'negative-peak' mode. Under low temperature (below 303 K), the area of hole injection from the electrode decreases with the decrease in temperature. The hole injected locally forms an opposing electric field, which makes the surface potential present the 'crater' mode. This work shows that the hole injected from the dielectric/electrode interface play a critical role in the charge accumulation process under electron radiation, which has important significance to avoid the spacecraft electrostatic discharge problem.

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Characteristics of charge and discharge of PMMA samples due to electron irradiation

Abstract: Characteristics of charge and discharge of PMMA samples due to electron irradiation *Feng Guo-Bao(封国宝) a) , Wang Fang(王芳) a) † , Hu Tian-Cun(胡天存) b) , and Cao Meng(曹猛) a) a)

Cited by 8 publications

References 36 publications

Electron beam irradiation on novel coronavirus (COVID-19): A Monte–Carlo simulation*

Electron beam irradiation on novel coronavirus (COVID-19): A Monte–Carlo simulation*

Self‐consistent charging of PMMA thin film induced by a penetrating electron beam in electron microscopy

The effect of temperature on charging behaviour of polyimide subjected to electron beam at vacuum

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Characteristics of charge and discharge of PMMA samples due to electron irradiation

Abstract: Characteristics of charge and discharge of PMMA samples due to electron irradiation *Feng Guo-Bao(封国宝) a) , Wang Fang(王 芳) a) † , Hu Tian-Cun(胡天存) b) , and Cao Meng(曹 猛) a) a)

Cited by 8 publications

References 36 publications

Electron beam irradiation on novel coronavirus (COVID-19): A Monte–Carlo simulation*

Electron beam irradiation on novel coronavirus (COVID-19): A Monte–Carlo simulation*

Self‐consistent charging of PMMA thin film induced by a penetrating electron beam in electron microscopy

The effect of temperature on charging behaviour of polyimide subjected to electron beam at vacuum

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Resources

About

Abstract: Characteristics of charge and discharge of PMMA samples due to electron irradiation *Feng Guo-Bao(封国宝) a) , Wang Fang(王芳) a) † , Hu Tian-Cun(胡天存) b) , and Cao Meng(曹猛) a) a)