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  • 1
    Electronic Resource
    Electronic Resource
    Determination of C-atom density downstream an Ar-CH4 rf plasma torch (1995)
    Springer
    Plasma chemistry and plasma processing 15 (1995), S. 221-230 
    Details
    ISSN: 1572-8986
    Keywords: C atom density determination ; gas temperature determination ; flowing post-discharge
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract Nitrogen, oxygen, and carbon atoms have been detected by optical emission spectroscopy in a common flowing post-discharge of an Ar-x CH4 rf plasma torch and an Ar-2%N2 microwave discharge. Gas temperature as determined from CN and N2 rotational svstems is 3200 ± 200 K in the rf torch and 700 ± 100 K in the post-discharge at a time 3 X10−2 s after the rf plasma torch. From the intensities of the N2 1st positive system, of NO, and of CN violet hands, the atom densities have been determined as 2 X 1016 cm3 for N, 1015 cm3 for O, and 6 X 1012 cm3 for C in the post-discharge at p=650 torr, with 103 of CH4 in the Ar torch.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01459697
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  • 2
    Electronic Resource
    Electronic Resource
    Concentrations of Active Species in the Flowing Afterglow of a Nitrogen Microwave Plasma (1998)
    Springer
    Plasma chemistry and plasma processing 18 (1998), S. 447-460 
    Details
    ISSN: 1572-8986
    Keywords: Nitrogen afterglow ; microwave discharge ; nitrogen atom concentration ; metastable nitrogen molecule concentration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract Measurements of nitrogen atom density, by means of NO chemical titration, along with an evaluation of the densities of some excited species N 2 (B, v=11), N 2 (B, v=2), N 2 (C, v=0), and N 2 + (B,v=0), by means of a spectroscopic study of some bands of dinitrogen, are achieved along the flowing afterglow of a dinitrogen microwave plasma (2450 MHz) for several pressures. The concentrations obtained are in the following range: [N]∼10 +15 , [N 2 (B, 2)]∼10 +9 –10 +10 , [N 2 (B, 11)]∼10 +8 –10 +9 , [N 2 (C, 0)]∼10 +6 –10 +7 , [N 2 + (B,0)]∼10 +6 -10 +8 (cm-3). From a kinetic study of the formation and decay of excited and charged species, an estimation of N 2 (A, v), N 2 (X, v, and N 2 + (X) densities can be derived: [N 2 (A, v)]∼10 +12 , [N 2 (X, v≥6)]∼10 +15 –10 +16 , [N 2 (X, v≥12)]∼10 +14 –10 +15 , [N 2 + (X)]∼10 +10 (cm -3 ).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021855131761
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    CN chemiluminescence in N2 + CH4 Flowing afterglow at low temperatures (1994)
    Springer
    Plasma chemistry and plasma processing 14 (1994), S. 197-208 
    Details
    ISSN: 1572-8986
    Keywords: Nitrogen afterglow ; CN chemiluminescence ; recombination ; hydrocarbon trace detection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract The spectra of flowing microwave post-discharge excited in N2 and N2 + CH4(N2 + C2H2) gas mixtures have been studied at low temperature (77 K). The molecular spectra of CN emitted by the collision-induced N + C and N + CH chemiluminescent reactions in the low-temperature afterglow system have been thoroughly investigated. The intensity of different CN (B2Σ+-X2Σ+) vibrational bands is very sensitive to low hydrocarbon concentration in nitrogen used as the working gas. Detection of hydrocarbon species has been demonstrated from concentrations of CH4 and C2H2 in N2 greater than 1010 molecules · cm−3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01447078
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    Paper (German National Licenses)
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