Excitation of O(<sup>1</sup>S) auroral green line from ambient air in a microwave-induced plasma jet at atmospheric pressure

Lee, Henry V.; Rosario, Leo Mendel D.; Tumlos, Roy; Ramos, Henry J.; Bo-ot, L.Ma.; Soriano, Maricor

doi:10.7567/jjap.57.066102

Cited by 3 publications

(14 citation statements)

References 45 publications

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“…The spectral shape is similar to those shown in literature. 12,[14][15][16][17] This optical emission is the source of the green plasma jet shown in Figure 2b. Figure 4a shows the medium-resolution spectra of the N 2 and N 2 /O 2 plasma jets, which were measured using the Czerny-Turner spectrograph with a focal length of 50 cm.…”

Section: F I G U R Ementioning

confidence: 95%

“…The authors of some papers notice the optical emission at around 557 nm in oxygen containing atmospheric-pressure plasmas. [11][12][13][14][15][16][17] The shapes of the optical emission spectra are not narrow lines but have molecular-band structures. They assigned the band emission to the formation of OAr *15 and ON * 2 excimers.…”

Section: Introductionmentioning

confidence: 99%

“…[12][13][14]17 The intensity of the excimer optical emission is usually lower than the intensity of the first positive system of molecular nitrogen. 13,14 However, Motomura et al 15 and Lee et al 17 observed dominant optical emissions of OAr * and ON * 2 excimers, respectively, and in these cases green plasmas are seen by naked eyes. Although the observations of the green laboratory plasmas are impressive, unfortunately, the wavelength resolutions of the spectra shown in the papers are not fine, and we cannot see the detailed spectrum of the green optical emission from the atmospheric-pressure plasmas.…”

Section: Introductionmentioning

confidence: 99%

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Observation of ¹D−¹S forbidden optical emission of atomic oxygen in atmospheric‐pressure N₂/O₂ plasma jet

Sasaki

Nishiyama

Shirai

2020

Contributions to Plasma Physics

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We observed green optical emission from an atmospheric-pressure N 2 /O 2 plasma jet. The green optical emission was composed of a line emission at λ = 557.71 ± 0.03 nm and a broadband component at 530 ≤ λ ≤ 560 nm. The line emission was assigned to the 1 D− 1 S forbidden transition of atomic oxygen, whereas the broadband emission was due to the formation of O(1 S)N 2 excimer. We measured the absolute densities of O(1 S) and O(1 S)N 2 using a spectrograph with the absolute sensitivity calibration, and we discussed the kinetics in the green plasma jet on the basis of the absolute O(1 S) and O(1 S)N 2 densities. According to the rate coefficients and the transition probabilities reported in literature, the present experimental results are explained if the densities of N 2 (A 3 Σ + u) and O(3 P) are 9 × 10 13 and 3 × 10 13 cm −3 , respectively.

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Section: F I G U R Ementioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Observation of ¹D−¹S forbidden optical emission of atomic oxygen in atmospheric‐pressure N₂/O₂ plasma jet

Sasaki

Nishiyama

Shirai

2020

Contributions to Plasma Physics

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“…As of now, only a few researchers have tried to artificially form the green line at atmospheric pressure using mixtures of in either dielectric barrier discharge (DBD) or in microwave induced argon plasma jets where the green line was reported to be from the emission of the excimer 11 . However, the experiments in DBD discharges using mixtures only measured weak emission from the O( S) compared to NO and .…”

Section: Introductionmentioning

confidence: 99%

“…As a result, these lines were observed only at higher flow rate and at lower power. Moreover, the plasma length was 1 cm which may not be very useful from the perspective of applications 11 , 14 .…”

Section: Introductionmentioning

confidence: 99%

A KHz frequency cold atmospheric pressure argon plasma jet for the emission of O(1S) auroral lines in ambient air

Jaiswal

Aguirre

Prakash

2021

Sci Rep

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Creation of the “auroral” green line, a fascinating occurrence commonly observed in the upper atmosphere, has long been a difficult endeavor, especially at atmospheric pressure. Here we report strong emission of the “auroral” green line for the first time in a kHz frequency, linear field atmospheric pressure plasma jet system. The device used 99.999% pure argon as a working gas for the plasma generation. Optical emission spectroscopy measurements of the after discharge region show the existence of 557.7 nm emission which corresponds to the transition O($$^1$$ 1 S)–O($$^1$$ 1 D). The intensity of the produced green line is strong enough that the entire plasma plume in the ambient air is visible as a green plasma. We provide the chemical reactions of O($$^1$$ 1 S) production in the plasma and the estimation of the density of the O($$^1$$ 1 S) metastable state using the kinetic reactions. Further, the O($$^1$$ 1 S) emission is characterized by changing the flow rate of argon, applied voltage and electrode gap. The adequate plasma length ($$> 25 \, \hbox {mm}$$ > 25 mm ) along with the production of a variety of reactive components viz; OH, $${\hbox {N}}_{2}^{+}$$ N 2 + and oxygen (777 nm) make this configuration useful for applications such as: blood coagulation, cancer treatment, sterilization, and waste treatment. Moreover, this setup can be potentially used as a test bed for the in-depth understanding of plasma chemistry relevant to the aurora and comet tails using a laboratory setting.

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Characterization of an atmospheric pressure plasma jet producing the auroral transition O(¹S) to O(¹D)

Jaiswal¹,

Aguirre²,

Gaag³

2022

Plasma Sources Sci. Technol.

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We present a detailed characterization of an atmospheric pressure plasma jet that produces the metastable oxygen states O(1S) and O(1D) with emission of the “auroral” green line. The device used 99.999% pure argon as a working gas for the plasma generation. Optical emission spectroscopy was used to understand the active species present in the plasma jet and to infer the mechanism of O(1S) creation and destruction. The continuum spectrum was used in conjunction with a method based on machine learning for determining the arbitrary electron probability distribution function. Discharge and plasma properties were estimated from Lissajous plots and using calculations with the BOLSIG+ software. The metastable oxygen forms for all operating parameters of the plasma jet system in a linear electrode conﬁguration. The camera images provided information of the overall plasma jet behavior as parameters were altered. While the metastable oxygen was produced for every iteration, the plasma jet behavior changed considerably when the powered and grounded electrodes are switched. Small admixtures of oxygen and nitrogen were introduced in the plasma jet to understand the kinetic processes of metastable oxygen destruction and the 557.7 nm auroral line. This behavior has implications for plasma reactive chemistry in fundamental areas such as auroral physics as well as technological applications of plasmas.

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Excitation of O(¹S) auroral green line from ambient air in a microwave-induced plasma jet at atmospheric pressure

Cited by 3 publications

References 45 publications

Observation of ¹D−¹S forbidden optical emission of atomic oxygen in atmospheric‐pressure N₂/O₂ plasma jet

Observation of ¹D−¹S forbidden optical emission of atomic oxygen in atmospheric‐pressure N₂/O₂ plasma jet

A KHz frequency cold atmospheric pressure argon plasma jet for the emission of O(1S) auroral lines in ambient air

Characterization of an atmospheric pressure plasma jet producing the auroral transition O(¹S) to O(¹D)

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Excitation of O(1S) auroral green line from ambient air in a microwave-induced plasma jet at atmospheric pressure

Cited by 3 publications

References 45 publications

Observation of 1D−1S forbidden optical emission of atomic oxygen in atmospheric‐pressure N2/O2 plasma jet

Observation of 1D−1S forbidden optical emission of atomic oxygen in atmospheric‐pressure N2/O2 plasma jet

A KHz frequency cold atmospheric pressure argon plasma jet for the emission of O(1S) auroral lines in ambient air

Characterization of an atmospheric pressure plasma jet producing the auroral transition O(1S) to O(1D)

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Excitation of O(¹S) auroral green line from ambient air in a microwave-induced plasma jet at atmospheric pressure

Observation of ¹D−¹S forbidden optical emission of atomic oxygen in atmospheric‐pressure N₂/O₂ plasma jet

Observation of ¹D−¹S forbidden optical emission of atomic oxygen in atmospheric‐pressure N₂/O₂ plasma jet

Characterization of an atmospheric pressure plasma jet producing the auroral transition O(¹S) to O(¹D)