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The Microsecond Pulsed Glow Discharge: Developments in Time-of-flight Mass Spectrometry and Atomic Emission Spectrometry
A spectroscopic investigation of the afterglow and - CORE
Elemental ratio determinations and compound-independent
Atmospheric‐pressure pulsed discharges and plasmas: mechanism
Characterization and applications of pulsed millisecond glow
This model uses several quantities as input data, such as electric field and potential, ion flux at the cathode, the fast.
Jun 1, 2020 the samples were analyzed by microsecond direct current pulsed glow discharge time-of-flight mass spectrometry (µs-pdc tof gdms).
A microsecond-pulsed glow discharge time-of-flight mass spectrometer was constructed and evaluated for elemental analysis. Mass spectra from the instrument show significant advantages, including higher signal-to-noise ratios than those of a dc glow discharge source.
A microsecond-pulse (ms-pulse) glow discharge (gd) source when in combination with a gd source, free sample atoms boosted by a microwave-induced plasma (mip) has been produced by cathode-sputtering in the gd enter the mip by developed and studied for optical emission spectrometry diusion and convection.
The focus of this dissertation is the study of the microsecond pulsed glow discharge (gd) source through developments with time-of-flight mass spectrometry (tofms) and atomic emission spectroscopy (aes). The gd is an electrical plasma long known for its ability to convert solid samples directly into the atomic state for subsequent analysis.
A high instantaneous power microsecond pulsed glow discharge reveals many interesting features as an ion source for atomic mass spectrometry and as a photon source for atomic emission spectroscopy. Its advantages over a conventional continuous source are high signal intensity, temporal profile resolution, addition.
Highly intense, non-uniform light that is uncharacteristically bright for a glow discharge. The main purpose of this thesis is to explore the likely experimental cause and basic physics of this phenomenon. In particular, the glow discharge’s secondary electron beam is explored and the consequences of this moderately energetic beam are examined.
In this paper, an atmospheric-pressure helium plasma jet driven by a home-made microsecond pulse generator was studied. The discharge was characterized by monitoring the voltage-current waveforms and head-on/side-on intensified charge coupled device (iccd) images. The effects of gas flow rate and pulse frequency on the plasma bullet propagation were studied.
A pulsed glow discharge, operating in the microsecond regime, has been found to be advantageous for the examination of solid samples. We have studied the spectroscopic response by atomic emission, absorption, fluorescence, and mass spectrometries. Results to date show enhanced efficiency for analytical response of the sputtered sample atoms.
A single microsecond pulse with a rising time of 75 μ s and a decaying time of 65 μ s is employed. It is the first time that a series of planar-type pressure waves which is induced by the microsecond-pulsed dialectic barrier discharge plasma actuator and propagates outward in the rising period is observed.
Keywords: bulk analysis; depth profiling; glow discharge; mass spectrometry; optical emission induced plasma (mip) device to a microsecond-pulsed.
[ 6 ], the capabilities of microsecond pulsed direct current glow discharge time-of-flight mass spectrometry (tof-ms) for qualitative analysis of several aromatic compounds as well as tungsten hexacarbonyl were demonstrated.
Glow discharge (also called a gas discharge) is probably using a pulsed dc or an alternating current (ac) glow discharge requires less than a microsecond.
The glow discharge is initiated when all of the following factors are present: i) a sufficiently high voltage is present across the device (between anode and cathode) ii) a trigger pulse of sufficient amplitude is present at the trigger electrode.
The atmospheric pressure glow discharges (apgd) with dual excitations in terms voltage pulses are introduced to ignite sub-microsecond pulsed discharge.
A glow discharge optical-emission spectrometry source was evaluated for use in imaging in the present work, a microsecond-pulsed glow discharge was used.
Glow discharge mass spectro- of a microcavity hollow cathode emission source. Metry has received more attention and commercial we have used pulsed glow discharges for over 20 application than its optical counterpart, but atomic years in our laboratory, primarily for gdms, but emission remains an attractive alternative due to the with complementary interests in atomic emission and simpler instrumentation and lower cost.
The sub-microsecond high voltage pulse excited glow discharges in atmospheric argon are studied. The discharge is generated between two copper electrodes both covered with ceramic sheets. The electrical characteristics of two discharge events in each voltage pulse in terms of discharge current amplitude and time.
Pulsed glow discharge is an ionization source capable of ionization at all these levels at the same time. Penning ionization by meta-stable argon, electron ionization.
Pulsed glow discharges in the microsecond range serving as an ion source for a second pulsed gd than that in the millisecond-pulsed discharge.
A microsecond pulsed glow discharge (mu s-pulsed gd) was used for elemental, structural and molecular analysis. This plasma was generated repeatedly at 100 hz with a 1 kv electrical pulse lasting.
When the apparatus works at an operating point with the discharge voltage of 234 v and current of 22 ma, the discharge operates in the normal glow mode and a stable plasma jet is formed between.
This article provides a brief account of glow discharge mass spectrometry the gd source can be operated in continuous or microsecond pulsed-power mode.
A double pulsed glow discharge was compared to the single pulsed mode as an ion source for atomic mass spectrometry. During the time-window between the first applied voltage pulse and signal collection, the second pulse is applied. The double pulse was used to enhance analyte ionization and study the timing sequences within the pulsed glow discharge, the signals from which were followed using.
A microsecond-pulsed direct current glow discharge (gd) was interfaced and synchronized to a time-of-flight mass spectrometer ms(tof) for time-gated generation and detection of elemental, structural, and molecular ions.
Keywords: pulsed glow discharge; ionizing plasma; recombining plasma; atomic emission; transient plasma with micro-millisecond duration pulsed power.
A microsecond pulsed glow discharge (μs pgd) in a grimm-type source is characterized by the so-called ``prepeak,'' which is a spike in both electrical current.
Pulsed glow discharges have been coupled to atomic emission, absorption and fluorescence spectrometry, as well as to mass spectrometry. 1–30 both milli-second (ms) and microsecond (ms) pulsed discharges have been (and still are) the subject of investigation, not only to improve.
The internal energy distributions, p(epsilon), of a millisecond pulsed radio frequency glow discharge plasma were investigated using tungsten hexcarbonyl w(co)(6) as a thermometer molecule. Vapor of the probe molecule, w(co)(6), was introduced into the plasma and subjected to various ionization and excitation processes therein.
Sector field µs-pulsed fast flow glow discharge mass spectrometry (µs-ff-gd-ms) is routinely applied for the direct analysis of a wide range of materials. Especially for aerospace, electronics and photovoltaic industries, quality control at high sample turnaround is required, for example for nickel.
A new model for microsecond pulsed glow discharge in a hollow cathode and its afterglow is described. The model is based on the monte-carlo method together with a new method for electrical field calculation, which is based on some phenomenological laws of plasma behavior.
The glow discharge may also be operated by using a pulsed current source. This is the pulsed glow discharge which consists of short glow discharges (with time lengths typically in the milli- or microsecond range), followed by an afterglow, which is generally characterized by a longer time-period.
A new prototype based on a microsecond pulsed glow discharge ion source coupled to a time-of-flight mass spectrometer was recently designed, constructed and analytically evaluated in our laboratory for simultaneous collection of elemental and molecular information, and as a gas-chromatographic detector of compounds of environmental concern.
Applications of microsecond pulsed fast flow glow discharge mass spectrometry (ms-ff-gd-ms). 14:00 o 7 overview of the nu astrum high resolution gdms and latest improvements. Nu instruments ltd, uk 4th international glow discharge spectroscopy symposium berlin.
The discharge that maintains hipims is a high-current glow discharge, which is transient or quasistationary. Each pulse remains a glow up to a critical duration after which it transits to an arc discharge. If pulse length is kept below the critical duration, the discharge operates in a stable fashion indefinitely.
Sep 10, 2014 dc glow discharge is a popular one among them, with the voltage applied between plasma brush driven by sub-microsecond voltage pulses.
Ray boxman, tel aviv universityipsta‐2014 at tel aviv university,5 feb 2014.
Ray boxman, tel aviv universityipsta‐2014 at tel aviv university5 feb 2014.
Providing complete material characterization mainly for metallurgy, the thermo scientific™ gd-ms system features a fast glow discharge ion source in a high-resolution mass spectrometer.
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