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  • 1
    Electronic Resource
    Electronic Resource
    Spectrum of anomalous random telegraph noise (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 7609-7611 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The alternate capture and emission of electrons at an individual defect site generates discrete switching in resistance, referred to as a random telegraph signal (RTS). Recent experiments indicate that some defects might have two mutually exclusive emission modes with distinct emission rates, which result in the anomalous RTS: a rapid-switching RTS modulated in time by a slow-switching RTS of the same amplitude. The spectrum is calculated of the anomalous RTS by assuming that the emission mode for a captured electron is determined at the moment of capture of the electron, and the probability for a given mode is a constant p in each event of capturing. It is shown that a distribution in p might lead to a 1/f spectrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354962
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  • 2
    Electronic Resource
    Electronic Resource
    Collisional electron detachment and decomposition cross sections for SF−6, SF−5, and F− on SF6 and rare gas targets (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 2254-2260 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Absolute total cross sections for collisional electron detachment and collision-induced dissociation (CID) have been measured for binary collisions of SF−6 and SF−5 with rare gas and SF6 targets for laboratory collision energies ranging from about 10 up to 500 eV. The cross sections for electron detachment of SF−6 are found to be surprisingly small, especially for the SF6 target, for relative collision energies below several tens of electron volts. Specifically, detachment onsets are found to occur at around 30 and 90 eV for the rare gas and SF6 targets, respectively. The CID channel which leads to F− as a product is observed to dominate detachment for relative collision energies below 100 eV. The results for the SF−5 projectile are remarkably similar to those exhibited for SF−6. The role of long-lived excited states in the reactant SF6 ion beam is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457033
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  • 3
    Electronic Resource
    Electronic Resource
    Reactive scattering and electron detachment for collisions of halogen negative ions with HCl, DCl, and HBr (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 5475-5480 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Absolute total cross sections have been measured for collisions of Cl−, Br−, and I− with HCl, DCl, and HBr for projectile energies ranging from 5 to 300 eV. The processes investigated include reactive scattering and electron detachment. The reactive scattering cross sections exhibit considerable isotope effects and the collisional dynamics are discussed within the framework of a spectator-stripping model which involves proton or deuteron abstraction. The results for the I− projectile are substantially different from those for Cl− and Br−; this difference is suggested to be related to the relative stability of the molecular anion, HI−.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454558
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  • 4
    Electronic Resource
    Electronic Resource
    Collisional electron detachment and decomposition rates of SF−6, SF−5, and F− in SF6: Implications for ion transport and electrical discharges (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 2261-2268 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Measured cross sections for prompt collisional detachment and decomposition of SF−6, SF−5, and F− in SF6 reported in the preceding companion paper are used to calculate detachment coefficients and ion-conversion reaction coefficients as functions of electric field-to-gas density ratio (E/N) for ion drift in SF6. Analysis from a model presented here using these coefficients suggests that prompt electron detachment from SF−6 and SF−5 in SF6 are insignificant processes in such ion-drift experiments. Calculated rates for ion-conversion processes indicate the necessity to: (1) reexamine the previously measured rates in SF6 from drift-tube experiments, and (2) use ion kinetic-energy distributions with larger high-energy tails than the standard distributions assumed in earlier calculations. The calculated detachment and reaction coefficients are used in a model which invokes detachment from long-lived energetically unstable states of collisionally excited SF−6 to explain the pressure dependence of previously measured detachment coefficients and the high detachment thresholds implied by analysis of electrical-breakdown probability data for SF6. Consistent with the interpretation of results from earlier work, the model indicates that at high pressure, measured detachment coefficients depend primarily upon rates for ion conversion and prompt collisional detachment from F−.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457646
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  • 5
    Electronic Resource
    Electronic Resource
    Ion energy distributions in inductively coupled radio-frequency discharges in argon, nitrogen, oxygen, chlorine, and their mixtures (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 6358-6365 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report ion energy distributions, relative ion intensities, and absolute total ion current densities at the grounded electrode of an inductively coupled Gaseous Electronics Conference radio-frequency reference cell for discharges generated in pure argon, nitrogen, oxygen, and chlorine, and in mixtures of argon with N2, O2, and Cl2. Measured current densities are significantly greater for pure argon and for mixtures containing argon than for pure N2, O2, and Cl2. For all three molecular gases, the ratio of molecular ions to the fragment ions decreases when argon is added to the molecular gas discharges. A possible destruction mechanism for the molecular ions involving metastable argon is discussed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370138
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  • 6
    Electronic Resource
    Electronic Resource
    Response to "Comment on ‘Calculation of electron transport in Ar–N2 and He–Kr gas mixtures—implications for validity of Blanc's law method' " [Phys. Plasmas 6, 4794 (1999)] (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 4797-4797 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873772
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  • 7
    Electronic Resource
    Electronic Resource
    Noncontact monitoring of liquid surface levels with a precision of 10 micrometers: A simple ultrasound device (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 1640-1641 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A simple inexpensive device has been designed to measure the position of a flat surface to an accuracy of ±10 μm and has been applied to monitor water levels in studies of spread monolayers at the air-water interface. This instrument provides for determination of surface location in a range intermediate between those accessible by physical methods and those requiring the much more expensive and difficult techniques of interferometry. This technique utilizes a sound transmitter operating at 45 kHz and simple microphones coupled to phase-shift measurements via a phase-to-voltage converter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142445
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  • 8
    Electronic Resource
    Electronic Resource
    Calculation of electron transport in Ar/N2 and He/Kr gas mixtures—implications for validity of the Blanc's law method (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 551-554 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electron drift velocities and corresponding mean energies have been calculated numerically using an approximate two-term solution of the Boltzmann transport equation for Ar/N2 gas mixtures at electric field-to-gas density ratios (E/N) below 2.0×10−20Vm2 (20 Td) and for He/Kr mixtures at E/N below 5.0×10−21 Vm2 (5.0 Td). The results are compared with predictions obtained from a method proposed by Chiflikian based on an "analog of Blanc's law" [Phys. Plasmas 2, 3902 (1995)]. Large differences are found between the results derived from the Blanc's law method and those found here from solutions of the transport equation that indicate serious errors and limitations associated with use of the Blanc's law method to compute drift velocities in gas mixtures. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872563
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  • 9
    Electronic Resource
    Electronic Resource
    Time evolution of ion energy distributions and optical emission in pulsed inductively coupled radio frequency plasmas (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 4510-4517 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This article reports the results of time-resolved measurements of ion energy distributions (IEDs), relative ion densities, as well as optical emissions and electrical characteristics in pulsed inductively coupled plasmas for the simple gas mixture of oxygen and argon (50%Ar:50%O2). The peak radio frequency power, frequency, repetition rate, and duty cycle were 200 W, 13.56 MHz, 500 Hz, and 85%, respectively. Examination of the time evolution of the data over the pulse cycle indicates that when the plasma is energized, it begins in the dim (E) mode undergoing at first slow changes in certain plasma parameters. After about 1.2 ms, a sudden transition to the bright (H) mode occurs. The characteristics of the IEDs are consistent with an average plasma potential profile that has (a) a relatively large collisionless sheath and narrow presheath during the dim mode and (b) a very narrow sheath and greatly extended presheath during the bright mode; the ion mean free path influences the peak position of the IED during the bright mode. For most of the pulse cycle, the relative abundances of the ions Ar+, O2+, and O+ maintain the relation %O2+≥%Ar+〉%O+.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1311827
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  • 10
    Electronic Resource
    Electronic Resource
    Ion fluxes and energies in inductively coupled radio-frequency discharges containing CHF3 (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 5612-5617 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of ion energy distributions, relative ion intensities, and absolute total ion current densities were made at the grounded electrode of an inductively coupled Gaseous Electronics Conference (GEC) radio-frequency reference cell for discharges generated in CHF3 and its mixtures with argon. In general, the dominant ion species detected were not due to direct ionization of the CHF3 feed gas. Results are presented for plasmas generated with and without a confining quartz annulus that has recently been used to extend the operating parameter range of inductively coupled GEC cells for certain etching gases. Compared to similar plasmas generated without the annulus, the presence of the ring increases the ion flux density by approximately a factor of 2, and increases the mean ion energies. The presence of the ring does not significantly affect the measured relative ion intensities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1319968
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