Study of spatial distributions of highly ionized nonequilibrium helium plasma at atmospheric pressures

Chinnov, V. F.; Kavyrshin, D. I.; Ageev, A G; Korshunov, O. V.; Sargsyan, M. A.; Efimov, A. V.

doi:10.1088/1742-6596/774/1/012200

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…The last significant difference between the spectra taken with a free jet and those with the polymer target is shown in figure 3(b) as a new emission was measured at 319 nm. This emission was identified as a He emission by comparing it to other measured spectra [43][44][45]. The reason that He only showed up for this spectra is because similarly to how the UHMWPE sample obstructed OH * from reacting with the ambient air the sample most likely also hindered the penning ionization shown in equation (10) which allowed for the He emission to be measured.…”

Section: Resultsmentioning

confidence: 88%

Investigation of a helium tubular cold atmospheric pressure plasma source and polymer surface treatment application

Turicek

Ratts

Kaltchev

et al. 2021

Plasma Sources Sci. Technol.

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Cold atmospheric plasma (CAP) is a simple and inexpensive method to produce plasma in ambient air. In this study, CAP was generated by flowing helium gas through a glass tube with a copper electrode rounded externally around it to provide an electric field for gas excitation. The plasma extended for up to a few centimeters from the opening of the tube forming a plume. Optical emission spectroscopy (OES) was used to identify the composition of the plasma along the length of the plume. Four positions along the plume were investigated at flow rates of 1, 1.5, and 2.5 L min−1. Results revealed that the plume consisted of a varying composition of excited state species dependent on the location in the plume and gas flow rate. Identified in the emission spectra were the nitrogen second positive and first negative system along with OH* emissions at 282 and 308 nm. The OH* emissions, found at the opening of the tube, had a higher intensity as the flow rate increased and were attributed to impurities from the ambient air in the source tubing, while the N2 and N2 + emissions came from the nitrogen of the ambient air and dominated the rest of the measured spectra. Identifying the species and their intensities at different locations of the plume with different flow rates helped in determining the appropriate location and flow rate needed for a specific application of the surface treatment of ultra-high-molecular-weight-polyethylene (UHMWPE) to change its roughness. Additional spectra were taken in situ with an UHMWPE sample present to compare the reactive species of a free jet with those when a target was present. Finally, preliminary roughness tests showed increases of as low as three and as much as over ten times the pristine value depending on the position of the polymer in the plume and the source flow rate.

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Section: Resultsmentioning

confidence: 88%

Investigation of a helium tubular cold atmospheric pressure plasma source and polymer surface treatment application

Turicek

Ratts

Kaltchev

et al. 2021

Plasma Sources Sci. Technol.

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“…Such investigation of non-equilibrium helium plasmas is still current and of interest (see [26][27][28][29][30]). …”

Section: Heliummentioning

confidence: 99%

The Collisional Atomic Processes of Rydberg Hydrogen and Helium Atoms: Astrophysical Relevance

et al. 2018

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Abstract:Elementary processes in astrophysical environments traditionally attract researchers' attention. We present the data needed for the inclusion of the specific atomic collisional processes in the investigation of the optical and kinetic properties of weakly ionized stellar atmosphere layers. The first type of processes are collisional ionisation (chemi-ionization) processes, and the second ones are excitation and de-excitation (i.e., (n − n )-mixing processes). We give the rate coefficients of the aforementioned processes for the conditions that exist in the solar photosphere, the atmosphere of DB white dwarfs, M-type red dwarfs, etc.

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Study of spatial distributions of highly ionized nonequilibrium helium plasma at atmospheric pressures

Cited by 2 publications

References 8 publications

Investigation of a helium tubular cold atmospheric pressure plasma source and polymer surface treatment application

Investigation of a helium tubular cold atmospheric pressure plasma source and polymer surface treatment application

The Collisional Atomic Processes of Rydberg Hydrogen and Helium Atoms: Astrophysical Relevance

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