An experimental study on the asymmetry and the dip form of the H line profiles in microwave produced plasmas at atmospheric pressure

Torres, Jimena; Palomares, JM Jose; Ma, Guojun; Gamero, A; Sola, A; Mullen, van der Jjam Joost

doi:10.1016/j.sab.2008.05.007

Cited by 11 publications

(4 citation statements)

References 16 publications

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“…Atomic lines of carbon and hydrogen (H β ) are identified at 477.18 nm and 486.15 nm, respectively. Double peak structure, asymmetry line profile, presence of a central dip, and additionally, a larger line width with respect to the other atomic lines (approximately four times of the H α line width) are major features of the H β line; these features are observable in this figure [4,[19][20][21]. C 2 molecular emissions in the spectral regions of 467-474 nm, 509-517 nm, and 550-564 nm correspond to Δν 1, Δν 0, and Δν −1 sequences, respectively.…”

Section: A Plasma Emissionmentioning

confidence: 76%

Identification of atomic lines and molecular bands of benzene and carbon disulfide liquids by using LIBS

et al. 2015

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Plasma emission of liquid benzene (C 6 H 6 ) and carbon disulfide (CS 2 ) have been studied by using the laser-induced breakdown spectroscopy (LIBS) technique in air. Atomic lines of carbon, hydrogen, sulfur, nitrogen, and oxygen and molecular emissions of CN and C 2 have been identified. The formation mechanism of C 2 and CN molecules has been discussed. The combustion process and high mole fraction of hydrogen in benzene caused a decreasing atomic line intensity of oxygen and an increasing atomic line intensity of hydrogen with respect to the CS 2 and air. Additionally, more intense CN molecular bands and weak nitrogen atomic lines in the C 6 H 6 spectrum compared to CS 2 have been observed. Furthermore, molecular emissions of C 2 have not been observed in the CS 2 spectrum. The electron temperature and vibrational temperature have been calculated from the atomic lines and molecular band intensity, respectively. Finally, the validity of the local thermodynamic equilibrium (LTE) assumption in this experiment has been shown.

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Section: A Plasma Emissionmentioning

confidence: 76%

Identification of atomic lines and molecular bands of benzene and carbon disulfide liquids by using LIBS

et al. 2015

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“…The double-peak structure of the H b profiles in an electric field, typically asymmetric early in the laserinduced plasma decay, 15 has been studied in detail. 4,14,17 A historic account for Stark effect splitting and shifting is given by J€ ager. 8 This effect is demonstrated in more detail in Fig.…”

Section: Measurement Methodologymentioning

confidence: 99%

The effect of blast wave re-focusing on a laser-induced plasma

Brieschenk¹,

Kleine²,

O’Byrne³

2013

Journal of Applied Physics

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The effect of laser-induced plasma confinement on lifetime and temperature is reported using cylindrical reflectors. This is determined experimentally in a gas cell, with hydrogen as test gas, and cylindrical shock reflectors of different diameters. The temperature evolution of confined and unconfined laser-induced plasma has been measured using plasma emission spectroscopy. Temperatures were determined through the plasma line-to-continuum thermometry technique in the hydrogen Balmer series using the H a and H b transitions at k ¼ 656 nm and k ¼ 486 nm, respectively. The experiments found that re-focusing the blast wave can significantly increase temperatures during the exponential decay of the plasma. The experimental results also show that confinement increases peak plasma temperatures, and that plasma lifetimes are only marginally affected by the confinement. V

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“…Due to the hundred fold higher frequency than ICPs, the skin depth is of an order of magnitude smaller than with the ICP and toroidal plasmas of a 10-fold smaller dimension can be realized. Studies on the asymmetry of the H β -line profiles were made and used for the diagnostics of atmospheric pressure MIPs (98). It is interesting that MIPs easily can be realized with Ar and He but also with Ne as the working gas.…”

Section: Atomic Emission Spectrometrymentioning

confidence: 99%