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  • 1
    Electronic Resource
    Electronic Resource
    Detection of atomic oxygen: Improvement of actinometry and comparison with laser spectroscopy (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 6232-6238 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The density of atomic oxygen in an oxygen rf discharge in the Gaseous Electronics Conference reference cell is determined from the intensity ratios of the argon λ=750 nm line (2p1–1s2) and the atomic oxygen lines λ=777 nm (5P–5S) and λ=844 nm (3P–3S). Laser induced fluorescence spectroscopy with two-photon excitation is applied to the oxygen plasma, and the results of both methods are compared. The improved actinometry is based on the calculation of electronic collisional excitation of the upper levels of these transitions. The required information on the electron energy distribution function is obtained from a model calculation of the discharge. Good agreement of the results are obtained, if excitations via dissociative channels and also quenching rates are accounted for. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1315332
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  • 2
    Electronic Resource
    Electronic Resource
    Novel scheme for atomic hydrogen detection by double-resonant four-wave mixing : Proceedings of the tenth topical conference on high temperature plasma diagnostics (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 587-589 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A novel laser diagnostic scheme for the detection of atomic hydrogen in high temperature plasmas is proposed. This scheme is based on double-resonant four-wave difference frequency mixing. Two waves are resonant with the n=1→n=3 two-photon transition at 2×205 nm and a third wave is slightly detuned off the Balmer-α resonance at 656 nm. A signal wave close to Lyman-α is generated and is emitted like a laser beam within a small solid angle, comparable to that of the incoming laser beams. The signal scales with the square of the ground state density. By applying spatial and spectral filtering background radiation can be efficiently suppressed. The determining physical quantities are presented. For an atomic temperature of about 10 eV a detection limit close to N=109 cm−3 results in a spatial and temporal resolution of a few cm and about 10 ns, respectively. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146294
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  • 3
    Electronic Resource
    Electronic Resource
    Vacuum ultraviolet absorption spectroscopy in the spectral interval of Lyman-α of atomic hydrogen and deuterium in an ion source plasma (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 1800-1806 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Atomic hydrogen and deuterium in the plasma of a magnetic multipole source are investigated with respect to the fraction of the atomic component and the energy distribution of the atoms. Information is obtained by analysis of the wings of the optically thick Lyman-α transitions, and by admixture of small amounts of the other isotope as a thermometer gas in order to warrant transparency in the center of the line. The atom to molecule density ratio is found to be around 15%; the analysis of the energy distributions yields a dominant cold component (Tcold∼400 K), a hot component (Thot(approximately-greater-than)2000 K) which comprises about 20% of the atoms, and a small but significant amount of fast atoms, described by Tfast with energies up to several eV; the relative amount of these atoms is below 1%. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146977
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  • 4
    Electronic Resource
    Electronic Resource
    The constricted glow discharge: A stationary source of vacuum–UV rare-gas excimer continua (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 565-568 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The construction and operation of a filamentary discharge in noble gases are described. The power and spectral properties of the observed continuous vacuum–UV excimer radiation are measured and compared with values found with standard VUV sources.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139834
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  • 5
    Electronic Resource
    Electronic Resource
    In situ density and temperature measurements of vibrationally excited hydrogen molecules in ion source plasmas : International conference on ion sources (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 619-621 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The role of highly vibrationally excited hydrogen molecules has been postulated to be of great importance in H− ion sources. However the the difficulty of making in situ measurements has led to a paucity of direct determinations of these species within the plasmas of these sources. Recently, vacuum-ultraviolet (VUV) laser absorption spectroscopy has been used to measure the H2 rovibrational populations up to v‘=5 and J‘=8 in a medium-power hydrogen plasma. This work extends those measurements to v‘=8 and to J‘=13. The populations of the vibrational levels still appear to be almost Boltzmann. The theoretically predicted plateau is not observed up to the detection limit. The dependence of several vibrational levels on discharge current and filling pressure is shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141936
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  • 6
    Electronic Resource
    Electronic Resource
    Quantum yield of triethylamine and tripropylamine for the detection of VUV radiation up to 160 nm in ionization chambers (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 701-703 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Ionization efficiencies of tripropylamine (TPA) and triethylamine (TEA) as a function of wavelength are determined on the basis of the known values of NO. A TEA-filled ionization chamber is applied to record excimer continua of a very simple VUV source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139241
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  • 7
    Electronic Resource
    Electronic Resource
    Registration, storage, and processing of Fabry–Perot ring spectra by a diode matrix combined with a microcomputer (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1749-1753 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A combination of a 32×32-element silicon-diode matrix and an Apple II computer is used to record and analyze Fabry–Perot interference ring patterns. The main advantage over conventional methods consists in the possibility of selecting the spectral resolution after registration and in the absence of alignment problems. Application of an image converter tube with VUV transmitting window in front of the matrix extends the applicability of the device to UV and VUV spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138088
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  • 8
    Electronic Resource
    Electronic Resource
    Correlation of molecular hydrogen dissociation and the film quality of diamondlike carbon in plasma enhanced chemical vapor deposition (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 3152-3154 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The ground state atomic hydrogen density in a hydrogen/acetylene discharge is compared with the diamondlike carbon (DLC) film quality as determined from in situ ellipsometry measurement of the refractive index. Two-photon laser-induced fluorescence (LIF) was employed for the detection of the ground state atomic hydrogen in the rf generated discharge. Absolute atomic hydrogen number densities were determined by calibrating the LIF detection system using a transfer standard. A direct correlation was found between the level of molecular hydrogen dissociation in the plasma and the refractive index of the DLC film. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.113706
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  • 9
    Electronic Resource
    Electronic Resource
    Quenching of the 750.4 nm argon actinometry line by H2 and several hydrocarbon molecules (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 3796-3798 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The quenching rate of the 750.4 nm actinometer line in argon by H2 and several hydrocarbons (CH4, C2H2, C2H4, C2H6) has been determined. Argon atoms at room temperature are excited by two-photon excitation at 184 nm to the 4p′[1/2]0 state, and the decay time of the fluorescence emission at 750.4 nm is measured. The quenching rates are inferred from the change of the decay time with the pressure of the quenching gas. For hydrocarbons, the quenching rates are of the order of 10−9 cm3 s−1. The radiative lifetime of the 4p′[1/2]0 is found to be 24 ns. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120555
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  • 10
    Electronic Resource
    Electronic Resource
    Attachment-induced ionization instability of a radio frequency excited discharge in oxygen (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 2023-2025 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The plasma of a 13.56 MHz capacitively coupled oxygen discharge of the Gaseous Electronics Conference Reference Cell type exhibits fluctuations of the plasma potential and of light emission in the kilohertz range. This behavior can be explained in terms of an attachment-induced ionization instability in connection with a sufficiently high fraction of negative ions. A necessary condition for the appearance of this type of instability is a strong positive dependence on electron temperature of the electron attachment coefficient describing the formation of negative oxygen ions. A strong volume loss of negative ions by neutral particles—metastable molecules in the present case—is an additional condition. Calculations of the temperature dependent coefficients for ionization and attachment by solving the time-independent Boltzmann equation in the two-term approximation in combination with the fluid equations of the charge carriers show that the criteria for the development of an attachment-induced ionization instability are fulfilled in the pressure domain around 30 Pa and for medium radio frequency voltages around 300 V. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124903
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