Pressure broadening and shift rates for Ar (s–p) transitions observed in an Ar–He discharge

Eshel, Ben; Rice, Christopher A.; Perram, Glen P.

doi:10.1016/j.jqsrt.2016.03.006

Cited by 18 publications

(5 citation statements)

References 26 publications

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“…Moreover, often in thermal plasmas the gas temperature was not homogeneous and well defined 29,28,32 , introducing extra uncertainty on measured coefficients. But after the event of the spectrally narrow band tunable diode lasers and their use in absorption spectroscopy (TDLAS) technique, the correction of the apparatus function width was no more needed and the pressure induced widths and shifts of many argon lines ending on the four lowest excited states of argon (two metastable Ar*(1s3) and Ar*(1s5) and two resonant Ar*(1s2) and Ar*(1s4) 33 ), which are always highly populated in argon plasmas, have been measured by several groups 34,35,36,37,38,39,40 41 . However, none of the above cited publications provided the pressure broadening coefficients of the 772.38 nm (1s5-2p7) and 772.42 nm (1s3-2p2) lines, which are studied in this work.…”

Section: Introductionmentioning

confidence: 99%

Pressure broadening of 772.376 and 772.421 nm argon lines and kinetics of argon metastable atoms

Sadeghi¹,

Magnan²,

Massines³

2022

Journal of Quantitative Spectroscopy and Radiative Transfer

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Section: Introductionmentioning

confidence: 99%

Pressure broadening of 772.376 and 772.421 nm argon lines and kinetics of argon metastable atoms

Sadeghi¹,

Magnan²,

Massines³

2022

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…2,[16][17][18][19][20] However, only a handful of papers report measurements of these vital species at atmospheric pressure. Most of the argon metastable species measurements are performed using tunable diode laser absorption spectroscopy 4,5,[21][22][23][24][25] or time-resolved laser induced fluorescence measurements. 1 In addition, the resonant states of argon could also be important energy reservoirs, but they have only been studied in low pressure argon plasmas.…”

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

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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.

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“…The relative contribution of each mechanism depends on the plasma conditions, such as pressure and gas temperature. Under the conditions studied (atmospheric pressure, gas temperatures of 300-310 K), the broadening is primarily due to instrumental, Doppler [39], van der Waals [40] and Stark effects [41], with negligible contributions from natural broadening [42] More details on the broadening mechanism can be found in the literature [22]. The Stark broadening of Ar-I 696.5 nm lines is linked with the electron density and can be used to determine the n e [43,44].…”

Section: Quantification Of Electron Density From Stark Broaden-mentioning

confidence: 99%

Development of efficient nonthermal atmospheric-pressure Ar-plasma jet through simultaneous spectroscopic characterization and radical quantification

Srikar,

Allabakshi,

Gomosta

et al. 2024

J. Phys. D: Appl. Phys.

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The work investigates the correlation between the plasma characteristics and reactive chemical species generation in an Ar-nonthermal atmospheric pressure plasma-jet (Ar-NTAPPJ) under various operating conditions such as gas flow rate, excitation voltage, and electrode gap and demonstrates the application of such understanding in developing efficient nonthermal plasma systems. The critical plasma parameters such as electron temperature (T e) and electron density (n e) under the various operating conditions were estimated using optical emission spectroscopy coupled with the collision radiative model and Stark broadening methods. At optimal setting of 5 LPM gas flow rate, 4 kV excitation voltage, and 6 mm electrode gap resulted in maximum T e (0.6 eV), enhancing •OH production (0.056 mM) in the liquid phase and OH(A-X) emission in the gas phase, highlighting the significance of operating conditions on building energy efficient plasma systems. The enhanced performance of the optimized Ar-NTAPPJ is demonstrated by taking atrazine as a model herbicide. The degradation performance data was correlated and validated with results obtained from spectroscopic diagnostics. By adequately tuning the operating parameters, four times enhancement in energy yield (∼150 mg kWh−1) was obtained without perturbing the nonthermal plasma mode. In nonthermal mode, to best of the authors knowledge, it is the highest reported energy yield for atrazine degradation. The scalability aspect of the present plasma jet was also investigated by Intensified Charge-Coupled Device camera-based imaging technique. The study establishes the importance of adequate diagnostics in developing efficient next-generation plasma reactors.

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Pressure broadening and shift rates for Ar (s–p) transitions observed in an Ar–He discharge

Cited by 18 publications

References 26 publications

Pressure broadening of 772.376 and 772.421 nm argon lines and kinetics of argon metastable atoms

Pressure broadening of 772.376 and 772.421 nm argon lines and kinetics of argon metastable atoms

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

Development of efficient nonthermal atmospheric-pressure Ar-plasma jet through simultaneous spectroscopic characterization and radical quantification

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Pressure broadening and shift rates for Ar (s–p) transitions observed in an Ar–He discharge

Cited by 18 publications

References 26 publications

Pressure broadening of 772.376 and 772.421 nm argon lines and kinetics of argon metastable atoms

Pressure broadening of 772.376 and 772.421 nm argon lines and kinetics of argon metastable atoms

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

Development of efficient nonthermal atmospheric-pressure Ar-plasma jet through simultaneous spectroscopic characterization and radical quantification

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Pressure broadening of 772.376 and 772.421 nm argon lines and kinetics of argon metastable atoms

Pressure broadening of 772.376 and 772.421 nm argon lines and kinetics of argon metastable atoms