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2 edition of Spectroscopic determination of electron temperatures in helium gas discharges found in the catalog.

Spectroscopic determination of electron temperatures in helium gas discharges

Noorizan Ahmed Sabri

Spectroscopic determination of electron temperatures in helium gas discharges

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  • 40 Currently reading

Published .
Written in English

    Subjects:
  • Helium,
  • Glow discharges

  • Edition Notes

    Statementby Noorizan Ahmed Sabri
    The Physical Object
    Paginationiii, 95 leaves :
    Number of Pages95
    ID Numbers
    Open LibraryOL14429333M

    and the discharge current and voltage were up to 50 A and ~20 V, respectively. In order to determine the electron temperature and density, spectroscopic observations along the expansion axis were carried out using a visible spectrometer (G= grooves/mm, f=50 cm) with a CCD camera. Figure 2 shows. Data System Mass Detector Analyzer Vacuum System Source Inlet Region *More precisely mass spectrometry determines the mass of a molecule. **The mass to charge ratio (m/z) is used to describe ions observed in mass convention, m is the numerical value for the mass of the ion and z is the numerical value for the charge of the Size: KB. For the first time, absolute densities of atomic nitrogen in its ground state (N4S) have been measured in hot dry and humid air plasma columns under post-discharge regime. The determination of space-resolved absolute densities leads to obtain the dissociation degrees of molecular nitrogen in the plasma. The hot plasmas are generated inside an upstream gas Author: Frédéric Marchal, Nofel Merbahi, Gaétan Wattieaux, Alain Piquemal, Mohammed Yousfi.   Method is used for determining volatile organic compounds in liquid environmental samples, including industrial discharges, by gas chromatography in tandem with mass spectrometry (GC/MS). Inter-laboratory studies performed more than 29 years ago were used to develop and validate this method.


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Spectroscopic determination of electron temperatures in helium gas discharges by Noorizan Ahmed Sabri Download PDF EPUB FB2

This option allows users to search by Publication, Volume and Page Selecting this option will search the current publication in context.

Selecting this option will search all publications across the Scitation platform Selecting this option will search all Cited by: Spectroscopic determination of the electron temperature in non-LTE argon and neon plasmas A.

Sáinz, M. García, M. Calzada l/min and coming out into the room through the open end of the discharge tube. The gas temperature was considered equal to the rotational temperature Trot Spectroscopic determination of the electron.

In Spectroscopic determination of electron temperatures in helium gas discharges book first method, the electron temperature of the plasma was determined from the measured relative intensities of the spectral lines of the consecutive ion.

Determination of Spectroscopic Temperatures and Electron Density in Rotating Gliding Arc Discharge Abstract: The spectroscopic characteristics of rotating gliding arc (RGA) discharge, codriven by a magnetic field and tangential gas flow, have Spectroscopic determination of electron temperatures in helium gas discharges book investigated by optical emission by: Determination of the Electron Temperature and Density at Plasma Edge with Helium Spectroscopy Spectra of neutral helium in the visible wavelength range are measured for a discharge with R ax =3.

9m and. The partial pressures of nitrogen as well as helium in the gas mixtures in the discharge chamber were mPa each. The volume of the resonator was × 10 −3 m 3. The pumping speeds inside the resonator were m 3 s −1 and m 3 s −1 for N 2 and He, by: /He plasma.

The increase in power density from ~ to ~ mW/cm 2 resulted in a decrease in the electron temperature from ~ eV to ~ eV. The highest electron temperature appeared Spectroscopic determination of electron temperatures in helium gas discharges book the discharge radial center and ~4 mm from the RF powered Size: 1MB.

Rotational temperature in the oxygen DC glow discharge is determined from atmospheric A-band of molecular oxygen. Two methods of estimation of this parameter taking into account the quality of the detected spectra are analysed and compared.

Radial profile of the rotational temperature is measured. No radial variations of rotational temperature have been Cited by: 9. 19 March Spectroscopic determination of gas temperature in high-pressure nonthermal equilibrium microwave discharge in One of the main objectives of research consists of making headway in spectral methods of gas-temperature determination in the high-pressure range by invoking for interpretation of experimental data calculations Author: S.

Gritsinin, I. Kossyi, K. Sergeichev, V. Silakov, I. Sychev, N. Tarasova, A. A helium microwave plasma torch (MPT) was coupled to time-of-flight mass spectrometry (TOFMS) for the detection of halogenated hydrocarbons separated by capillary gas chromatography (GC).

The GC-MPT-TOFMS system offered excellent stability over the course of the experiments and avoided mass spectral peak distortions caused by spectral skew. In the Cited by: The electron temperature (Te) and electron density (ne) of a helium glow discharge was determined at different pressures.

For Te calculation, two different techniques were used that is specific for two different plasma models: line intensity ratio for steady state Spectroscopic determination of electron temperatures in helium gas discharges book model and Boltzmann plot diagnostic for local thermal equilibrium : Jenny Lou Balabuena Sagisi, Michelle Celebrado, Rommil Bacurin Emperado, Wilson Garcia.

Complementary optical diagnostics for determination of rate coefficients and electron temperatures in noble gas discharges Article in Plasma Sources Science and Technology 11(1) Trace rare gas optical emission spectroscopy is carried out to investigate the excitation temperature, degree of nitrogen dissociation and relative densities of active species 16145 and [N 2 +] in inductively coupled helium admixed nitrogen plasma using Ar as an actinometer, for different discharge parameters.

The excitation temperature increases with the increase in rf power and helium fraction Cited by: Abstract: Thermal conductivities of binary gas systems are calculated on the basis of existing experimental data and of Lennard-Jones and rigid-sphere interatomic interaction approximations for the case of gas discharge in Ne-He mixtures.

Assuming that the gas temperature varies only in the radial direction and using the calculated thermal conductivities, Cited by: 5.

Introduction. The plasma electron temperature T e is one of the most important parameters used for plasma modeling, in opacity calculations, plasma line broadening studies, etc.

The most popular nonperturbative spectroscopic techniques for T e determination involve absolute and/or relative line intensity measurements. The plasma electron temperature determined in this Cited by: 2.

This paper reports the plasma discharge analysis of a dielectric barrier discharge (DBD) source. Helium is used as a working gas. The analysis is performed at fixed working pressure and operating frequency. The investigations are carried out using sinusoidal supply for the generation of discharges where two current pulses have been observed with different Cited by: 1.

Malyshev M V and Donnelly V M Determination of electron temperatures in plasmas by multiple rare gas optical emission. Metastable antiprotonic helium (He+) is a three-body atom2 consisting of a normal helium nucleus, an electron in its ground state and an antiproton.

Within the dielectric-barrier discharge of the LTP probe, He2+ is the dominant positive ion when helium is used as the plasma supporting gas. This helium dimer ion (He2+) has two important roles: First, it serves to carry energy from the discharge into Cited by:   The characteristics of plasma temperatures (gas temperature and electron excitation temperature) and electron density in a pulsed-dc excited atmospheric helium plasma jet are studied by relative and absolute optical emission spectroscopy (OES).

High-resolution OES is performed for the helium and hydrogen lines for the determination of electron Cited by: Fig.8 Plasma density n and electron temperature Tincrease with the discharge current. P=3* Pa Fig.6 In-vacuum fiber probe for spectroscopic measurements. The plasma parameters, such as plasma density and electron temperature, are closely related to the discharge current which can be directly controlled by the heating.

the mean electron temperature in the argon dc glow discharge [7]–[11]. EXPERIMENTALSETUP The discharge cell consists of two movable parallel elec-trodes enclosed in a pyrex tube.

The two electrodes were made ofcopper–brassdisksofcmdiameter,whilethepyrexglass tube was 4 cm in diameter. The tube was pumped down by aFile Size: KB.

In this study, a systematic spectroscopic characterization of a low-temperature plasma (LTP) probe operated with He/N 2 gas mixtures is carried out.

The influence of several experimental parameters (e.g., different He/N 2 gas mixtures, discharge voltage, and gas flow rate) on the dielectric-barrier discharge afterglow was was found that an increase of the nitrogen Cited by: 3. The capillary helium dielectric barrier discharge (DBD) operating at atmospheric pressure was investigated by means of optical emission spectroscopy with the aim to determine the dominant broadening mechanism of the helium spectral lines, gas temperature and electron number density.

The dependence of emissioCited by: 9. A dc microhollow cathode discharge (MHCD) plasma was generated inflowing helium gas containing water vapor. The cathode hole diameters were,and mm, each with a length of mm. Emission spectroscopy was carried out to investigate the discharge mode and to determine the plasma parameters.

For the mm cathode, stable MHCDs in an Cited by: The temperature calculated from the Langmuir probe technique is somewhat higher than the temperature measured from the spectroscopic technique. It may be due to the following reasons.

Firstly, the electron temperature is obtained from the I-V characteristic of the probe on the assumption that the electron energyFile Size: KB. The characteristics of plasma temperatures (gas temperature and electron excitation temperature) and electron density in a pulsed-dc excited atmospheric helium plasma jet are studied by relative and absolute optical emission spectroscopy (OES).

High-resolution OES is performed for the helium and hydrogen lines for the determination of electron density Cited by: A spectroscopic diagnostic tool has been developed to determine the electron temperature and the neutral density in helium, hydrogen and argon plasmas from absolutely calibrated spectroscopic measurements.

For each gas, a method of analysis which uses models specific to each species present in the plasma (neutral atom or singly ionized atom) has been defined. A spectroscopic diagnostic tool has been developed to determine the electron temperature and the neutral density in helium, hydrogen and argon plasmas from absolutely calibrated spectroscopic measurements.

For each gas, a method of analysis which uses models specific to each species present in the plasma (neutral atom or singly ionized atom. The molecules have been debrominated and charged by insertion into a gas discharge.

In both cases we see a series of C 20 Br - n clusters, with n ranging from 13 to 0 in the upper spectrum ( Cited by: Estimated plasma concentration in pure-deuterium discharges amounted to 8x cm-3, while that in pure helium shots was ()x cm-3 only.

Estimates of the electron temperature, from the ratio of intensities of the chosen spectral lines and the continuum, gave values ranging from 5 eV to 50 eV. The expansion phenomenon of this plasma flame was studied under different experimental conditions. In every case, the characteristic parameters of this expanded plasma such as electron density, electron and gas temperatures, or density population of excited atomic levels were measured by using optical emission spectroscopic by: 4.

equation. It is shown that the diagnostic method is relatively independent of the discharge gas temperature up to approximately K.

As a demonstration we have carried out spectroscopic diagnostics of a non-equilibrium atmospheric pressure plasma jet which uses air as the working gas. The electron temperatureFile Size: KB. Passive plasma spectroscopy is a well-established non-intrusive diagnostic technique.

Depending on the emitter and its environment which determine the dominant interactions and effects governing emission line shapes, passive spectroscopy allows the determination of electron densities, emitter and perturber temperatures, as well as other quantities like Cited by: 3.

helium and hydrogen was introduced through mass flow controllers. The flows of helium and hydrogen gas were sccm and 20sccm, respectively. The gas pressure, measured using a baratron gauge, was Torr.

The particle density estimated from the gas pressure by us-ing the ideal gas law at room temperature (K) was. EXPERIMENT ATOMIC SPECTROSCOPY Procedure: Part I: Spectral Lines of Helium & Hydrogen A.

Preparation of a Calibration Curve for the Spectroscope Using the Helium Spectrum First check to make sure the power is off, then place a helium gas discharge tube in the receptacles of the light source.

Turn on the light Size: 1MB. affected by the electron density ne, the electron temperature Te and the gas temperature Tg. However, for the atmospheric-pressure low-temperature argon discharges used in this work, the electron temperature (or effective electron temperature) is found to be in a narrow range 1–2eV and the gas temperature is in the range –K [20–23].

Spectroscopy / s p ɛ k ˈ t r ɒ s k ə p i / is the study of the interaction between matter and electromagnetic radiation (via electron spectroscopy, atomic spectroscopy, etc).

Historically, spectroscopy originated through the study of visible light dispersed according to its wavelength, by a the concept was expanded greatly to include any interaction with radiative. The distribution of hydrogen atoms responsible for emission of the Balmer H{alpha} line in the region of the dielectric barrier discharges in the helium and hydrogen as well as in the argon and hydrogen mixtures, in the direction perpendicular to the electrode surfaces, has bee determined by the optical emission spectroscopy accounting for the polarization of the emitted light.

electrodes and increasing the flow rate of helium gas. With the use of an rf power supply, the operation in the mode is beneficial for the stable discharge and suppresses transition to the occurrence of arcs.4,5) The gas temperature of the discharge is typically between 25 and C, and thus the thermal damage to the substrate is decreased File Size: KB.

Gas temperature. From points of both fundamental investigation and applications, gas temperature (Tg) is one pdf the important basic plasma parameters strongly affecting the discharge property, especially the plasma chemistry as most chemical reactions are temperature dependent, and thus influences the final outcomes of plasma applications.

Author: Qing Xiong.Electron properties in an atmospheric helium plasma jet determined by Thomson scattering S Hübner 1,4, J Download pdf Sousa 2, V Puech, G M W Kroesen and N Sadeghi3 1 Department of Applied Physics, Eindhoven University of Technology, PO BoxMB Eindhoven, The Netherlands 2 LPGP, CNRS & Université de Paris-Sud, Orsay, France.A spectral line is a dark or bright line in an otherwise uniform and continuous ebook, resulting from emission ebook absorption of light in a narrow frequency range, compared with the nearby frequencies.

Spectral lines are often used to identify atoms and "fingerprints" can be compared to the previously collected "fingerprints" of atoms and molecules, and are .