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An atmospheric-pressure, high-aspect-ratio, cold micro-plasma.

Lu X, Wu S, Gou J, Pan Y - Sci Rep (2014)

Bottom Line: The electron density of the plasma plume estimated from the broadening of the Ar emission line reaches as high as 3 × 10(16) cm(-3).The sheath thickness of the plasma could be close to the radius of the plasma.The ignition voltages of the plasma increase one order when the radius of the dielectric tube is decreased from 1 mm to 3 μm.

View Article: PubMed Central - PubMed

Affiliation: 1] State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, P.R. China [2] IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, P.R. China.

ABSTRACT
An atmospheric pressure nonequilibrium Ar micro-plasma generated inside a micro-tube with plasma radius of 3 μm and length of 2.7 cm is reported. The electron density of the plasma plume estimated from the broadening of the Ar emission line reaches as high as 3 × 10(16) cm(-3). The electron temperature obtained from CR model is 1.5 ev while the gas temperature of the plasma estimated from the N2 rotational spectrum is close to room temperature. The sheath thickness of the plasma could be close to the radius of the plasma. The ignition voltages of the plasma increase one order when the radius of the dielectric tube is decreased from 1 mm to 3 μm.

No MeSH data available.


(a) Gaussian fitting of the Hg 691.5 nm line profile recorded using the optical system with the grating of 1200 groove/mm and slit width of 50 μm. (b) The relationship between the Stark broadening width and the electron density for Te = 10,000 K and Te = 40,000 K. (c) Voigt fitting of the Ar 696.5 nm line profile recorded using the optical system with the grating of 1200 groove/mm and the slit width of 50 μm.
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f3: (a) Gaussian fitting of the Hg 691.5 nm line profile recorded using the optical system with the grating of 1200 groove/mm and slit width of 50 μm. (b) The relationship between the Stark broadening width and the electron density for Te = 10,000 K and Te = 40,000 K. (c) Voigt fitting of the Ar 696.5 nm line profile recorded using the optical system with the grating of 1200 groove/mm and the slit width of 50 μm.

Mentions: The profiles arising from these mechanisms can be accurately approximated by Gaussian (Doppler and instrumental broadening) or Lorentzian (Van der Waals and Stark broadening) forms, with their combination representing a Voigt profile. ΔλL and ΔλG are the broadening widths (full width at half maximum) of the Lorentzian and Gaussian profiles, respectively, given by ΔλL = ΔλS + ΔλV and , where ΔλS, ΔλV, ΔλD, and Δλi refer to the Stark, van der Waals, Doppler and instrument broadening widths, respectively. The part of the line broadening corresponding only to the Stark broadening can be obtained by separating (deconvolution) the Stark broadening from the total broadened profile, with the knowledge of other broadening components. The instrumental broadening width Δλi is determined by using a low-pressure Hg lamp. The instrumental line profile at 691.5 nm is fitted by a Gaussian profile, and the Δλi is obtained to be 0.088 nm, as shown in Fig. 3(a).


An atmospheric-pressure, high-aspect-ratio, cold micro-plasma.

Lu X, Wu S, Gou J, Pan Y - Sci Rep (2014)

(a) Gaussian fitting of the Hg 691.5 nm line profile recorded using the optical system with the grating of 1200 groove/mm and slit width of 50 μm. (b) The relationship between the Stark broadening width and the electron density for Te = 10,000 K and Te = 40,000 K. (c) Voigt fitting of the Ar 696.5 nm line profile recorded using the optical system with the grating of 1200 groove/mm and the slit width of 50 μm.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4265786&req=5

f3: (a) Gaussian fitting of the Hg 691.5 nm line profile recorded using the optical system with the grating of 1200 groove/mm and slit width of 50 μm. (b) The relationship between the Stark broadening width and the electron density for Te = 10,000 K and Te = 40,000 K. (c) Voigt fitting of the Ar 696.5 nm line profile recorded using the optical system with the grating of 1200 groove/mm and the slit width of 50 μm.
Mentions: The profiles arising from these mechanisms can be accurately approximated by Gaussian (Doppler and instrumental broadening) or Lorentzian (Van der Waals and Stark broadening) forms, with their combination representing a Voigt profile. ΔλL and ΔλG are the broadening widths (full width at half maximum) of the Lorentzian and Gaussian profiles, respectively, given by ΔλL = ΔλS + ΔλV and , where ΔλS, ΔλV, ΔλD, and Δλi refer to the Stark, van der Waals, Doppler and instrument broadening widths, respectively. The part of the line broadening corresponding only to the Stark broadening can be obtained by separating (deconvolution) the Stark broadening from the total broadened profile, with the knowledge of other broadening components. The instrumental broadening width Δλi is determined by using a low-pressure Hg lamp. The instrumental line profile at 691.5 nm is fitted by a Gaussian profile, and the Δλi is obtained to be 0.088 nm, as shown in Fig. 3(a).

Bottom Line: The electron density of the plasma plume estimated from the broadening of the Ar emission line reaches as high as 3 × 10(16) cm(-3).The sheath thickness of the plasma could be close to the radius of the plasma.The ignition voltages of the plasma increase one order when the radius of the dielectric tube is decreased from 1 mm to 3 μm.

View Article: PubMed Central - PubMed

Affiliation: 1] State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, P.R. China [2] IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, P.R. China.

ABSTRACT
An atmospheric pressure nonequilibrium Ar micro-plasma generated inside a micro-tube with plasma radius of 3 μm and length of 2.7 cm is reported. The electron density of the plasma plume estimated from the broadening of the Ar emission line reaches as high as 3 × 10(16) cm(-3). The electron temperature obtained from CR model is 1.5 ev while the gas temperature of the plasma estimated from the N2 rotational spectrum is close to room temperature. The sheath thickness of the plasma could be close to the radius of the plasma. The ignition voltages of the plasma increase one order when the radius of the dielectric tube is decreased from 1 mm to 3 μm.

No MeSH data available.