Spectroscopic Characteristics of Supersonically Expanding Nitrogen Arc-Jet Plume—Strong Atomic Lines and Weak Molecular Band Spectra

Akatsuka, Hiroshi; Hatcho, Masahiko; Matsuura, Haruaki

doi:10.1109/tps.2014.2330840

Cited by 3 publications

(3 citation statements)

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“…[25][26][27] Furthermore, emission of N atoms was also observed at wavelengths λ = 742, 744 and 746 nm. 18,27) It should be remarked that the argon lines cannot be observed with sufficient intensity in Figs. 3(b)-3(c), which is considered to be rapid collisional quenching of argon excited states with N 2 molecules.…”

Section: Oes Measurement Systemmentioning

confidence: 96%

“…It should be also noted that the plasma parameter of the argon plasma without gas puff was already examined in the previous study with this discharge apparatus under the similar condition. [16][17][18] The electron temperature T e on the plasma jet axis was found to be T e ∼ 0.8-1.0 eV at Z ∼ 30 mm, T e ∼ 0.5-0.7 eV at Z ∼ 100 mm, and T e ∼ 0.3-0.4 eV at Z ⩾ 170 mm, where Z is the longitudinal distance measured from the anode nozzle. Meanwhile, the electron density N e was found to be N e ∼ 10 13 -10 14 cm −3 at Z ⩽ 100 mm, N e ∼ 10 12 -10 13 cm −3 at Z ∼ 200 mm, and N e ∼ 10 11 -10 12 cm −3 at Z ∼ 300 mm.…”

Section: Experimental Equipmentmentioning

confidence: 99%

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Non-equilibrium characteristics of vibrational and rotational temperatures of N₂-B and C States puffed onto argon arc jet plume

Fukukawa

Nezu

Akatsuka

2019

Jpn. J. Appl. Phys.

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Band spectra of the first positive (1PS) and the second positive (2PS) systems of nitrogen molecule are analyzed with an optical emission spectroscopy (OES) measurement when N 2 gas is puffed onto the Ar plasma jet. It is found that T v ; T r ; 0.17 eV for the C state, while T v ; 0.28-0.35 eV, and T r ; 0. 038-0.050 eV for the B state, all of which are determined by fitting the theoretically calculated spectrum with those measured experimentally. Since the electron temperature in the observed area is about 0.4 eV, it is naturally considered that the N 2 C states are mainly produced by the resonant energy transfer from the Ar metastable to the N 2 ground state. It is also considered that similar values of T v and T r of the C state are the approximate value of the Ar gas temperature. Meanwhile, the vibrational distribution of the B state shows that the B state is populated not only by the radiative decay of the C state but also from other collisional processes, since the Franck-Condon principle cannot predict the vibrational population of the B state from the C state.

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Section: Oes Measurement Systemmentioning

confidence: 96%

Section: Experimental Equipmentmentioning

confidence: 99%

Non-equilibrium characteristics of vibrational and rotational temperatures of N₂-B and C States puffed onto argon arc jet plume

Fukukawa

Nezu

Akatsuka

2019

Jpn. J. Appl. Phys.

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“…Akatsuka et al reported the generated N atom density is 10 24 m −3 maximum at the arc discharge region. The loss of nitrogen atoms to the wall is small because of supersonic arc-jet [11]. Ichiki et al reported about a new nitriding method in which pulsed-arc plasma jet with N and hydrogen mixture gas is used.…”

Section: Introductionmentioning

confidence: 99%

Generation of Spiral Shape Nitrogen Recombining Plasma for Atomic Nitrogen Source

Asaoka

Ohno

Hayashi

et al. 2019

Plasma and Fusion Research

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We propose a new method using a spiral shape nitrogen plasma with a long magnetic connection length to produce high density nitrogen (N) atoms for nitriding application. A high density N molecular ion plasma was generated by DC discharge and is transported along a long spiral magnetic field line. As a result, the electron temperature drops along the magnetic field to be low enough to produce dissociate recombining plasma, where dissociative recombination would occur to generate N atoms. 2D Langmuir probe measurement showed that the electron temperature and density decreased along the magnetic field. Optical emission spectroscopy showed the ratio of the atomic N and N molecular emission intensities increased with a discharge power. The ground state N atom density was estimated by analyzing the atomic line intensity.

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Optical properties of N2/Ar plasma generated by electron beams with silicon nitride transmission window at high pressures

Yan

Chen

et al. 2023

Physics of Plasmas

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In this paper, we report the generation of nitrogen/argon electron beam plasmas with a 0.4 μm-thick silicon nitride transmission window. The measured transmittance of the electron beam is about 92% when the incident energy of electron beam is 40 keV. The optical properties of the electron beam plasma are investigated at high pressures. The luminescence intensity distribution of nitrogen and argon electron beam plasmas shows a good similarity with changing the gas pressure, suggesting that electron beam ionization is independent of background gas. At the same gas pressure, the nitrogen plasma with conical structure has a longer length along the incident direction of the electron beam and a smaller divergence cone angle compared with the argon plasma. In the nitrogen discharge, it is found that the intensities I380.4, I399.7, and I391.4 corresponding to characteristic lines at 380.4, 399.7, and 391.4 nm decrease along the incident direction of the electron beam, which is correlated with the reduction of the electron density along the incident direction of the electron beam. There is no change in the ratio of I399.7 to I380.4, indicating the spatial uniformity of the electron temperature. When the pressure increases, the ionization process induced by primary electron is enhanced, generating more plasma electrons, which is responding to the increase in the characteristic line intensity. At the same time, the neutral particle collision processes are enhanced and the electron temperature decreases with the increase in the pressure, which is believed to contribute to the observed reduction of the I399.7/I380.4 ratio.

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Spectroscopic Characteristics of Supersonically Expanding Nitrogen Arc-Jet Plume—Strong Atomic Lines and Weak Molecular Band Spectra

Cited by 3 publications

References 12 publications

Non-equilibrium characteristics of vibrational and rotational temperatures of N₂-B and C States puffed onto argon arc jet plume

Non-equilibrium characteristics of vibrational and rotational temperatures of N₂-B and C States puffed onto argon arc jet plume

Generation of Spiral Shape Nitrogen Recombining Plasma for Atomic Nitrogen Source

Optical properties of N2/Ar plasma generated by electron beams with silicon nitride transmission window at high pressures

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Spectroscopic Characteristics of Supersonically Expanding Nitrogen Arc-Jet Plume—Strong Atomic Lines and Weak Molecular Band Spectra

Cited by 3 publications

References 12 publications

Non-equilibrium characteristics of vibrational and rotational temperatures of N2-B and C States puffed onto argon arc jet plume

Non-equilibrium characteristics of vibrational and rotational temperatures of N2-B and C States puffed onto argon arc jet plume

Generation of Spiral Shape Nitrogen Recombining Plasma for Atomic Nitrogen Source

Optical properties of N2/Ar plasma generated by electron beams with silicon nitride transmission window at high pressures

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Product

Resources

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Non-equilibrium characteristics of vibrational and rotational temperatures of N₂-B and C States puffed onto argon arc jet plume

Non-equilibrium characteristics of vibrational and rotational temperatures of N₂-B and C States puffed onto argon arc jet plume