Metastable Ar(1s5) density dependence on pressure and argon-helium mixture in a high pressure radio frequency dielectric barrier discharge

Emmons, Daniel J.; Weeks, David E.; Eshel, Ben; Perram, Glen P.

doi:10.1063/1.5009337

Cited by 30 publications

(12 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Plasmas operating at atmospheric pressure in argon have witnessed a tremendous growth in last few decades. The nonequilibrium feature of such discharges allows production of highly excited and reactive species initiated by energetic electrons, which have enabled a plethora of applications, including gas discharge laser systems such as optically pumped rare gas lasers (OPRGLs) operated in Ar/He mixtures, [1][2][3][4][5] gas discharge lamps, plasma medicine, [6][7][8] surface modification, [9][10][11] and surface decontamination. [12][13][14] In highly repetitive discharges, such as radio frequency (RF) driven plasmas, the long-lived charged and energetic species from the previous discharge cycle enable to sustain stable discharges at lower voltage requirements.…”

Section: Introductionmentioning

confidence: 99%

Characterization of an RF-driven argon plasma at atmospheric pressure using broadband absorption and optical emission spectroscopy

Nayak

Simeni

Rosato

et al. 2020

Journal of Applied Physics

View full text Add to dashboard Cite

Atmospheric pressure plasmas in argon are of particular interest due to the production of highly excited and reactive species enabling numerous plasma-aided applications. In this contribution, we report on absolute optical emission and absorption spectroscopy of a radio frequency (RF) driven capacitively coupled argon glow discharge operated in a parallel-plate configuration. This enabled the study of all key parameters including electron density and temperature, gas temperature, and absolute densities of atoms in highly electronically excited states. The space and time-averaged electron density and temperature were determined from the measurement of the absolute intensity of the electron-atom bremsstrahlung in the visible range. Considering the non-Maxwellian electron energy distribution function, an electron temperature (T e ) of 2.1 eV and an electron density (n e ) of 1.1 × 10 19 m −3 were obtained. The time-averaged and spatially resolved absolute densities of atoms in the metastable (1s 5 and 1s 3 ) and resonant (1s 4 and 1s 2 ) states of argon in pure Ar and Ar/He mixture were obtained by broadband absorption spectroscopy. The 1s 5 metastable atoms had the largest density near the sheath region with a maximum value of 8 × 10 17 m −3 , while all other 1s states had densities of at most 2 × 10 17 m −3 . The dominant production and loss mechanisms of these atoms were discussed, in particular, the role of radiation trapping. We conclude with a comparison of the plasma properties of the argon RF glow discharges with the more common He equivalent and highlight their differences.

show abstract

Section: Introductionmentioning

confidence: 99%

Characterization of an RF-driven argon plasma at atmospheric pressure using broadband absorption and optical emission spectroscopy

Nayak

Simeni

Rosato

et al. 2020

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…5, a и 5, c следует, что в случае ионов Ar + 2 процессы (1) и (2) становятся одинаково эффективными при T e ≈ 10000 K, а по мере роста температур T и T e диссоциативное возбуждение начинает преобладать. Эти результаты находятся в полном соответствии с оценочными расчетами, осуществленными в работе [46], и указывают на важность учета канала (2) при составлении кинетических моделей аргоновой плазмы, представляющих интерес для разработки лазеров с оптической накачкой на инертных газах (OPRGL) [10][11][12][13].…”

Section: кс кислов аа нариц вс лебедевunclassified

“…Процессы образования и распада молекулярных ионов представляют интерес для спектроскопии, кинетики и диагностики низкотемпературной плазмы [1][2][3], физики ранней вселенной [4][5][6], для разработки источников ВУФ излучения [9] и мощных газовых лазеров [10][11][12][13]. Большое внимание уделяется, в частности, изучению процессов столкновения молекулярных ионов с электронами, включая ионизацию [14], фрагментацию [15,16], диссоциативную рекомбинацию [17] и прямую диссоциацию электронным ударом [18,19].…”

Section: Introductionunclassified

“…На основе этих выражений в работах [46,48] были получены полуэмпирические оценочные формулы для соответствующих констант скоростей ДВ ионов He + 2 и Ar + 2 . Эти формулы использовались в [10][11][12][13] при построении кинетических моделей аргоновой плазмы атмосферного давления в рамках разработки лазеров с оптической накачкой на инертных газах (OPRGL). Их применимость ограничена областью температур T e 2 eV при рабочем диапазоне T e 5 eV.…”

Section: Introductionunclassified

See 1 more Smart Citation

Прямое Диссоциативное Возбуждение Гетероядерных И Гомоядерных Ионов Инертных Газов Электронным Ударом

Кислов¹,

Нариц²,

Лебедев³

2020

Журнал Технической Физики

View full text Add to dashboard Cite

A theoretical description of the process of dissociative excitation of a molecular ion by electron impact in the case of effective population of a huge number of its vibrational-rotational levels is presented. Our consideration is based on the quantal version of the theory of non-adiabatic transitions between the electronic terms of a molecular ion combined with replacing the summation over vJ-levels by integration over v and J. Semianalytical formulas are derived for the integral contribution of the entire vibrational-rotational quasicontinuum to the cross sections, $\sigma_T^{\mathrm{de}}(\varepsilon)$, and the rate constants, $\alpha^{\mathrm{de}}(T, T_e)$ of the process under study in a plasma with temperatures $T_e$ and $T$ of its electronic and ionic components. The developed theory is used to study the processes of dissociative excitation of heteronuclear (HeXe$^{+}$ and ArXe$^{+}$) and homonuclear (Ar$_2^{+}$ and Xe$_2^{+}$) ions of inert gases. We demonstrate a strong dependence of the results on the ion dissociation energy and large differences in the behavior and characteristic values of $\sigma_T^{\mathrm{de}}(\varepsilon)$ and $\alpha^{\mathrm{de}}(T, T_e)$ for these systems in different ranges of electron energy, $\varepsilon$, and temperatures $T_e$ and $T$. The regions of dominance of the contributions of two competing channels are determined: direct dissociative excitation and dissociative recombination into total cross sections and the rate constants of destruction of rare gas molecular ions by electron impact. Analyzing behavior of the differential rate constants of dissociative excitation per unit range of electron energy in the final channel of reaction we demonstrate qualitative differences in the dynamics of this process for weakly bound and moderately bound molecular ions.

show abstract

“…for a typical APPJ [6]. Temperature and pressure of the whole environment was assumed to be 300 K and 1 atm.…”

Section: Model Descriptionmentioning

confidence: 99%

Reaction Kinetics of Active Species from an Atmospheric Pressure Plasma Jet Irradiated on the Flowing Water Surface — Effect of Gas-drag by the Sliding Water Surface —

Shirafuji

2019

J. Photopol. Sci. Technol.

View full text Add to dashboard Cite

We performed numerical simulations for investigating atmospheric pressure humid air chemistry triggered by metastable argon atoms fed from an atmospheric pressure plasma jet (APPJ) irradiated on a flowing water surface. We discuss the gas-drag effect caused by the flow of water surface. The gas-drag effect may alter spatial profiles of gas-phase species around the APPJ. It may alter also spatial profiles of the flux of active species impinging on the water surface. The numerical simulations have revealed that the flux profile of OH radicals is surely altered by the gas-drag effect and its flux on the surface is reduced to 1/6 of that on the static surface.

show abstract

Metastable Ar(1s5) density dependence on pressure and argon-helium mixture in a high pressure radio frequency dielectric barrier discharge

Cited by 30 publications

References 29 publications

Characterization of an RF-driven argon plasma at atmospheric pressure using broadband absorption and optical emission spectroscopy

Characterization of an RF-driven argon plasma at atmospheric pressure using broadband absorption and optical emission spectroscopy

Прямое Диссоциативное Возбуждение Гетероядерных И Гомоядерных Ионов Инертных Газов Электронным Ударом

Reaction Kinetics of Active Species from an Atmospheric Pressure Plasma Jet Irradiated on the Flowing Water Surface — Effect of Gas-drag by the Sliding Water Surface —

Contact Info

Product

Resources

About