Last edited by Gardazil
Saturday, November 14, 2020 | History

3 edition of helium glow discharge found in the catalog.

helium glow discharge

William John Condell

helium glow discharge

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  • 6 Currently reading

Published by Catholic University of America Press in Washington .
Written in English

    Subjects:
  • Electric discharges through gases,
  • Helium

  • Edition Notes

    Statementby William John Condell, Jr.
    Classifications
    LC ClassificationsQC711 .C6
    The Physical Object
    Pagination23 p. :
    Number of Pages23
    ID Numbers
    Open LibraryOL5969586M
    LC Control Number65073623
    OCLC/WorldCa9425229

    If this order is for an organization with tax-exempt status, you will need to have an account on our website. If you don't already have an account, you can create one by filling out all the information on this screen, including creating a password. A two-dimensional numerical model of an atmospheric pressure glow (APG) discharge was developed. The simulation of the APG in helium with some nitrogen impurities successfully reproduced the discharge evolution during the breakdown process observed in experiments. The results show that the breakdown first appears at the central region of the.


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helium glow discharge by William John Condell Download PDF EPUB FB2

Keywords: Atmospheric pressure glow discharge, Helium-oxygen plasma, Polyester/cotton fabric, Plasma process parameters, Wicking height 1 Introduction Polyester/cotton (P/C) blended fabrics are becoming increasingly popular due to the desired properties of comfort and aesthetic look, which are.

Helium-Glow Photometer for Picomole Analysis of Alkali Metals Abstract. The low-power electric-glow discharge in helium can excite efftctively the characteristic emission lines of sodium and potassium.

The helium-glow photometer used to gener-ate the glow and measure the light is a relatively simple apparatus; it can be used to analyze samples Cited by: A helium alternating current glow discharge plasmas have been successfully generated.

Measurements of the plasma parameters using Langmuir probes, in the absence of dust particles, provide plasma densities (n{sub e}) of 10{sup 17 }m{sup −3} and electron temperatures (T{sub e}) ranging from 2 to 4 eV. Book Search tips Selecting this option will search all publications across the Scitation platform Selecting this option will search all publications for the Publisher/Society in context.

Protein destruction by a helium atmospheric pressure glow discharge: Capability and mechanisms Journal of Applied Physics(); Cited by: 2LAPLACE CNRS, Toulouse, France Abstract:The possibilities of obtaining a large-volume non-self-sustained atmospheric pres- sure glow discharge in helium and ambient air with help from a self-sustained normal dc glow discharge in helium are demonstrated.

Observation of the transition from a Townsend discharge to a glow discharge in helium at atmospheric pressure Appl. Phys. Lett. 91, (); / This article is copyrighted as. Atmospheric-pressure helium glow discharge at helium glow discharge book between parallel plate dielectric electrodes is studied experimentally and theoretically.

Experimental work was carried out by spatiotemporal optical emission spectroscopy to examine the behavior of electrons. In a helium glow discharge, the A. Stark shift of the 4 3S1 ~ 2 3P0,1,2 transition (03BB ~ 4 Å) induced by nonresonant interaction of the 4 3S and 4 3P levels with a multimode CO2 laser field is measured as a function of laser intensity in the range IL 35 MW/cm2.

Departure from the linear intensity dependence given by second order perturbation theory is observed for IL > 2 MW. BREAKDOWN STUDIES OF HELIUM AND NITROGEN IN PARTIAL VACUUM SUBJECT TO NON-UNIFORM, UNIPOLAR FIELDS IN THE KHZ RANGE Except where reference is made to the work of others, the work described in this.

Gas-discharge lamps are a family of artificial light sources that generate light by sending an electric discharge through an ionized gas, a helium glow discharge book, such lamps use a noble gas (argon, neon, krypton, and xenon) or a mixture of these include additional substances, like mercury, sodium, and metal halides, which are vaporized during startup to become part of the gas mixture.

A novel direct current glow discharge sustained in helium at atmospheric pressure has been developed. Current–voltage behavior and spectroscopic characteristics strongly suggest that the system operates in the glow regime, in spite of the high pressure.

Pumping tests during helium glow discharge revealed that the 3 mechanical pumps were not capable of supplying the necessary backing pressure for the torus turbopumps.

A roots pump with a pumping speed of m 3 /h was added to MF and is backed up with a m 3 /h Normetex pump. In glow discharge optical emission spectroscopy, a glow discharge is a plasma formed by the passage of electric current through a low-pressure gas (Fig. ).It is created by applying a voltage between two metal electrodes in a glass tube containing gas.

Helium glow discharge book the voltage exceeds a certain value, called the striking voltage, the gas in the tube ionizes, becoming a plasma, and it begins. The photo of the APGD at discharge current of 1 A in helium is presented in fig.

One can see, the structure of the glow discharge is as follows: a thin (less than 1 mm thick) disc of glow emission resides above the cathode surface, whereas the glowing column is adjacent to anode. There is the Faraday dark space between these glow regions.

A glow discharge is a plasma formed by the passage of electric current through a gas. It is often created by applying a voltage between two electrodes in a glass tube containing a low-pressure gas. When the voltage exceeds a value called the striking voltage, the gas ionization becomes self-sustaining, and the tube glows with a colored light.

The color depends on the gas used. DC glow discharges were experimentally investigated in atmospheric pressure helium, argon, hydrogen, nitrogen and air.

The discharges were characterized by visualization of the discharges and voltage and current measurements for current of up to several milliamperes. a helium glow discharge They used a null collision Monte Carlo technique to model electron flow through the cathode sheath to allow for the computation of ionization and excitation rates.

A linear electric field profile obtained through optogalvanic spectroscopy experiments was used. Effects of helium addition to an argon glow discharge plasma on emission lines of sputtered particles. Analytical Chemistry60 (7), DOI: /aca Ali Salimian, Roohollah Haghpanahan, Abul Hasnath, Hari Upadhyaya.

The paper investigates the composition of the plasma on the axis of the positive column of a helium glow discharge. It is shown that four rate equations for the concentration of atomic and molecular ions and metastables can be written.

For conditions of gas pressure between 5 and 40 Torr and currents between 10 mA and mA, the equations can be simplified and solved. A glow discharge apparatus was used in this experiment of Ar discharge at a pressure range between Torr and 12 Torr, a power of 20 W and 40 l/min flow rate of gases.

Xiaohui Yuan and Laxminarayan L. Raja Abstract— The structure of a capacitively coupled high-pressure glow (HPG) discharge in high-purity helium is investigated using a detailed one-dimensional modeling approach. Impurity effects are modeled using trace amounts of nitrogen gas in helium.

Characteristics in the jet region of helium radio-frequency atmospheric-pressure glow discharge with array generators are investigated by a two dimensional fluid model. The influences of upstream discharge characteristics, gas flow and their cooperative effects on the distribution of species densities and gas temperatures (T h) are studied.

Collisional radiative model of a helium capillary glow discharge including atomic collisions G. Gousset and C. Boulmer-Leborgne Groupe de Recherche sur l Energétique des Milieux Ionisés, CNRS, Université d Orléans, U.E.R. Sciences Fondamentales et Appliquées, Orléans Cedex, France (Reçu le 27 mairévisé le 12 octobre, accepté le I S decembre ).

Excerpt from Field Guide to Lasers A helium-neon laser is based on a tube filled with a mixture of helium and neon gas. An electrical glow discharge excites helium atoms, which transfer their energy to neon atoms during the collisions.

Studies were performed to determine the practical benefits of mixed discharge gases (Ar and He) in the bulk and depth-resolved analysis of solids using a radiofrequency glow discharge atomic emission source.

This study examined the characteristics of analyte emission intensity and. Abstract: Atmospheric pressure glow discharge (APGD) was produced in a 5-mm helium gap between two plane-parallel electrodes of 50 mm in diameter, each covered by a 1-mm thick quartz plate.

The influence of the helium gas flowing in parallel through the helium gap on APGD was studied. The helium flow rate varies up to 12 liter per minute, corresponding to helium at a speed of.

Helium can form unstable compounds, known as excimers, with tungsten, iodine, fluorine, sulfur, and phosphorus when it is subjected to a glow discharge, to electron bombardment, or reduced to plasma by other means. The molecular compounds HeNe, H and WHe 2, and the molecular ions He + 2, He 2+ 2, HeH +, and HeD +.

This ambient ionization techniques page does not have content at this time, but you may be able to find information on this topic in the following places. Wikipedia: Helium atmospheric pressure glow discharge ionization Google Search for Helium atmospheric pressure glow discharge ionization; Or see Definitions of terms relating to mass spectrometry (IUPAC Recommendations ).

Atmospheric pressure glow discharge (APGD) was produced in a 5-mm helium gap between two plane-parallel electrodes of 50 mm in diameter, each covered by a 1-mm thick quartz plate. The influence of the helium gas flowing in parallel through the helium gap on APGD was studied.

The helium flow rate varies up to 12 liter per minute, corresponding to helium at a speed of 67 cm/s flowing through a 5. the addition of helium and oxygen to an rf argon glow discharge. Experimental Glow-discharge ion source A Grimm-type ion source attached to a commercial inductively coupled plasma mass spectrometer (Model SPQ A, Seiko Instr.

Inc.) has been described elsewhere.5,16 The source was slightly modified for this. Excitation of metal impurities in a glow discharge in helium at atmospheric pressure. Arkhipenko, S.

Zgirovskii, L. Simonchik, E. Smetanin & D. Solov'yanchik Journal of Applied Spectroscopy vol pages – ()Cite this article.

Glow Discharge Processes: Sputtering and Plasma Etching - Kindle edition by Chapman, Brian. Download it once and read it on your Kindle device, PC, phones or tablets. Use features like bookmarks, note taking and highlighting while reading Glow Discharge Processes: Sputtering and Reviews: 4.

Abstract: In this paper, the dual-frequency atmospheric-pressure glow discharge is operated in helium with a small amount of oxygen. It is found that the plasma density increases, but the reactive atomic oxygen density decreases with high-frequency (HF) power.

The plasma density also increases with low-frequency (LF) power, but it is weak as with HF power. CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): We have started the systematic study of an atmospheric pressure helium glow discharge in a flowing gas.

The computer model used in this investigation is a two-dimensional hydro-dynamics model. The model is based on the Poisson equation and the transport equations of the different plasma species.

Noble Gases Argon is the current carrier in this discharge tube, while mercury is what produces the glow.

pslawinski, The discharge of argon averages out to blue, but argon lasers are among those that can be tuned to various wavelengths.

Photo-resist ashing by atmospheric pressure glow discharge Kun H. Han a,*, Jung G. Kang a, Han S. Uhm a, Bang K. Kang b a Department of Molecular Science and Technology, Ajou University, San 5 Wonchon-Dong, Youngtong-Gu, SuwonRepublic of Korea b Solution of Plasma System, SanhakwonAjou University, San 5 Wonchon-Dong, Youngtong-Gu, SuwonRepublic of.

Find link is a tool written by Edward Betts. searching for Glow discharge 62 found ( total) alternate case: glow discharge Glow-discharge optical emission spectroscopy ( words) no match in snippet view article find links to article Glow-discharge optical emission spectroscopy (GDOES) is a spectroscopic method for the quantitative analysis of metals and other non-metallic solids.

Figure Characteristics of a low pressure glow discharge. After Francis [], helium or argon, at a pressure between 1 to 20 Torr, and a dc potential V is applied across the electrodes, through a current limiting resistor R. If the dc potential V, is increased by changing the value of the variable. 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 corona model and Boltzmann plot diagnostic for local thermal equilibrium model.

An obstructed glow discharge in helium has been ivestigated both experimentally and by means of a Monte Carlo simulation. The voltage-current characteristics of the discharge have been measured and the spatial distribution of the electric field between the electrodes was determined using Stark spectroscopy.

The electric field distribution was also determined by a self-consistent calculation. Boronisation by glow discharge with 30% B(CH 3) 3 in He was applied in the TdeV tokamak. Plasma current and density scans were performed before and after the process; the impurity influxes (visible spectroscopy and mass spectrometry), the plasma contamination (VUV spectroscopy and effective ion charge Z eff) and the radiated power P rad were measured.The sub‐lethal effects of the radio‐frequency, atmospheric‐pressure glow discharge plasma jet on the lipase are studied.

The experimental measurements show that the activity of the lipase increases significantly after treated by the plasma jet within one minute. This enhancing effect is attributed to the changes of the structures of the.A V high voltage, DC power supply maintains a glow discharge or plasma in a glass tube containing an optimal mixture (typically to ) of helium and neon gas, as shown in Fig.

1 and indicated in the diagram of Fig. 2. The discharge current is limited to about 5 mA by a 91 kW ballast resistor. Energetic electrons accelerating from the.