Optical Emission Spectra from Laser Ablation of Graphite at 266 nm and 1064 nm under a Magnetic Field

AbstractOptical emission spectra in the ultraviolet and visible range (110-600 nm) were recorded during pulsed ArF laser ablation of graphite targets in vacuum and in low pressure N2 atmospheres. During graphite ablation in vacuo, the recorded spectrum consists only of several atomic lines lying below 300 nm. They are due to radiative transitions from upper carbon excited states down to the fundamental one. The most intense atomic lines are observed at 247.85 nm and near 165.5 and 156 nm. During ablation in increasing nitrogen pressure, the spectra are quickly dominated by the bands of the CN violet system whereas the intensity of the atomic lines only slightly increases. We have observed the bands corresponding to the vibrational sequences Δv = +1 (358.4-369.7 nm), Δv = 0 (384.7-394.4 nm) and Δv = -1 (414.3-421.6 nm). They already appear at nitrogen pressure as low as 0.05 mbar. Their intensity reaches a broad maximum between 0.5 and 0.8 mbar and slowly decreases.Taking into account the results of this optical study, the deposition of carbon nitride thin films has been undertaken. The surface analysis by X-ray photoelectron spectroscopy (XPS) of the obtained C1-xNx deposits shows a correlation law between the nitrogen incorporation (x) and the pressure of nitrogen.

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Laser ablation at solid–liquid interfaces: An approach from optical emission spectra

The Journal of Chemical Physics ◽

10.1063/1.481465 ◽

2000 ◽

Vol 112 (19) ◽

pp. 8645-8653 ◽

Cited By ~ 135

Author(s):

Tetsuo Sakka ◽

Shuji Iwanaga ◽

Yukio H. Ogata ◽

Akira Matsunawa ◽

Tadashi Takemoto

Keyword(s):

Laser Ablation ◽

Emission Spectra ◽

Optical Emission ◽

Liquid Interfaces ◽

Solid Liquid ◽

Optical Emission Spectra

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Optical Emission Spectra of Oxygen Plasma Produced by Radio-Frequency Plasma

Applied Science and Convergence Technology ◽

10.5757/jkvs.2009.18.2.102 ◽

2009 ◽

Vol 18 (2) ◽

pp. 102-107

Author(s):

Do-Yeob Kim ◽

Min-Su Kim ◽

Tae-Hoon Kim ◽

Ghun-Sik Kim ◽

Hyun-Young Choi ◽

...

Keyword(s):

Radio Frequency ◽

Oxygen Plasma ◽

Emission Spectra ◽

Optical Emission ◽

Radio Frequency Plasma ◽

Frequency Plasma ◽

Optical Emission Spectra

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REFORMING OF ETHANOL IN PLASMA-CATALYTIC SYSTEM WITH DC AND AC ROTATING GLIDING DISCHARGE

10.46813/2021-131-117 ◽

2021 ◽

pp. 117-121

Author(s):

O.A. Nedybaliuk ◽

T.A. Tereshchenko ◽

I.I. Fedirchyk ◽

P.V. Tyshchuk ◽

V.P. Demchina

Keyword(s):

Synthesis Gas ◽

Emission Spectra ◽

Optical Emission ◽

Reaction Chamber ◽

Catalytic Reforming ◽

Instantaneous Power ◽

Wide Aperture ◽

Ethanol Reforming ◽

Gliding Discharge ◽

Optical Emission Spectra

The article presents the results of the investigation of the reforming of ethanol into synthesis gas using a plasmacatalytic system with either AC or DC wide-aperture rotating gliding discharge. Current and voltage oscillograms of the wide-aperture rotating gliding discharge were measured. The time-dependence of the instantaneous power of the discharge in the air was built. The photographs of the discharge in the airflow and discharge during the ethanol reforming were compared. The optical emission spectra of the plasmas of the torches of AC and DC wide-aperture rotating gliding discharges were studied. The rotational and vibrational temperatures of the plasma torch in the reaction chamber were determined. The results of the gas-chromatography of the synthesis gas produced during the plasm-catalytic reforming of ethanol using either AC or DC rotating gliding discharge are presented.

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