3 edition of Helium ionization detection apparatus found in the catalog.
Helium ionization detection apparatus
|Series||NASA technical memorandum -- 77505|
|Contributions||United States. National Aeronautics and Space Administration|
|The Physical Object|
It is alsocharacterized by its ability to penetrate inside different materials of knownTable Properties of common X-ray detectorsNomenclatureEnergy range(keV)DE/E @ keV (%)Dead timeevent (ms)Maximum countrate (1/s)Gas ionization (currentmode)–50 N/A N/A Gas proportional –50 15 Multi-wire and microstripproportional3. 7. Apparatus Gas chromatograph/Flame Ionization/Electron Capture Detection System - must be capable of subambient temperature programming. A recent publication (8) describes an automated GC system in which the cryogenic sampling and analysis features are combined. This system allows simultaneous flame ionization and electron capture detection.
We describe direct imaging of the densities of helium metastable atoms in the afterglow of a helium dielectric-barrier discharge (He-DBD) using collisionally assisted laser-induced fluorescence (LIF). For the conditions tested, comparison of fluorescence images of a He-DBD with analogous maps of emission from highly excited helium atoms revealed that helium metastable atom densities did not Cited by: Advanced Industrial Chemistry supplies unique gas chromatographic detectors based on the dielectric barrier discharge (DBD) which provides a reliable and robust plasma source for gas chromatography detectors. The DBD uses high voltage alternating current to generate a plasma which is non-thermal (no electric wear), operates at elevated pressures and can be operated with pure gasses instead if.
helium carrier and make-up gas, and delivers sensitivity in the low ppm range. Many labs are reluctant to store hydrogen fuel gas for safety reasons, so the fact that the HID requires only helium is a significant advantage. The HID is especially useful in combination with aThermal Conductivity The Flame Ionization Detector (FID) is the most widely and successfully used gas chromatographic (GC) detector for analyzing volatile hydrocarbons and many carbon containing compounds. It is highly reliable, provides great sensitivity, and has a wide linear range of detection.
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Get this from a library. Helium ionization detection apparatus. [Ryukou Nagai; United States. National Aeronautics and Space Administration.]. A helium ionization detector (HID) is a type of detector used in gas chromatography. Principle. HID connected to a GC has the great advantage to use helium as both the carrier gas and the ionization gas.
HID is a ion detector which uses a radioactive source, typically β-emitters, to create metastable helium species. The radioactive source ionizes helium atoms by bombarding them with emissions. Helium (from Helium ionization detection apparatus book ἥλιος, romanized: Helios, lit.
'Sun') is a chemical element with the symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic boiling point is the lowest among all the is the second lightest and second most abundant element in the observable Group: group 18 (noble gases).
Pulsed-modulated helium-ionization detection Surface studies The apparatus described in Fig. 1 was used to perform temperature pro- grammed desorption (TPD) experiments with samples of catalysts that are used in an RCD.
Initially, ca. 30 mg Helium ionization detection apparatus book gold sponge was conditioned under helium flow by heating to for 10 min in the catalyst bed Cited by: 7. than published methods using a ﬂame ionization detector (FID) and a thermal conductivity detector (TCD), and has the further advantage of detecting both analytes with only one detector.
Limits of detection were ppmv for both hydrogen and methane and the method had a linear dynamic range (LDR) of three orders of magnitude (–ppm, v/v).
The ionization of inert gases, including helium, and organic compounds, including acetone and methane, and the control and the transfer of the resulting ions have been achieved.
SUMMATiY Sensitive detection of atmospheric gases and organic vapors using ionization detec- tors has been accomplished with either helium or argon carrier gas. Addition of permanent gases in low concentration increased the electrical conductivity of an elec- tric discharge excited in l~elium, while addition of higher concentrations of the same Cited by: 8.
Requires only helium carrier and make-up gas Perfect Complement to the TCD; The Helium Ionization Detector is a “universal” detector which responds to all molecules except neon.
The HID is particularly useful for volatile inorganics like NOx, CO, CO2, O2, N2. A comprehensive review of leak detection methods and apparatus is given in Refs.
,  and . the change in ionization cross-section can be monitored by the signal of an ion gauge or even a The small diameter of the helium atoms allows the detection of very small Size: KB.
ANALYSIS FOR IMPURITIES IN HELIUM USING THE HELIUM IONIZATION DETECTOR By Charles A. Seitz 1 ABSTRACT This Bureau of Mines report describes a chromatographic method for an alyzing impurities in helium that utilizes a helium carrier gas contain ing 25 to 30 ppm Ne.
An example of the effect of trace amounts of niFile Size: 2MB. detection of evaporated helium atoms by field ionization. In both cases, the recoil of a helium nucleus in the superfluid produces rotonsandphononswhich,uponarrivingatthefreesurface,cause helium atoms to be released by quantum evaporation.
FIG. Field ionization. (a) Illustration of a. Helium detection in gas mixtures by laser-induced breakdown spectroscopy Article (PDF Available) in Applied Optics 51(7):B March with Reads How we measure 'reads'.
HELIUM MASS SPECTROMETER LEAK DETECTOR Major Components Spectrometer Tube Vacuum System Basic Helium Leak Detectors Conventional Leak Detector Contra-FlowTM Leak Detector Test Procedures Component Leak Detectors Multi-Test Options Dry Leak Detection Accessories Helium Spray Probe Power Probe Calibration Leaks Tuning Leak Test Port Adapters 5/5(1).
Patent: Closed-loop pulsed helium ionization detector. Closed-loop pulsed helium ionization detector. Full Record; Other Related Research. Bennani et al from their recent (e,3e) measurement on helium In comparing the momenta of one ejected electron versus the recoil-ion, for double ionization the correspondence obtained in single ionization (ﬁgure 2) is completely lost due to the many body nature of the collision.
The next step will be a comparison of the recoil-ion. electron bombardment, you will use a slightly different method and apparatus to measure several excitation potentials and the ionization potential of helium. The Franck-Hertz Experiment A schematic diagram of the apparatus used by Franck and Hertz is shown in figure 1 at the top of the next Size: 56KB.
Helium Ionization Detector - HID Overview The Helium Ionization Detector is a universal detector, responding to all molecules except neon. It requires only helium carrier and make-up gas, and is sensitive to the low ppm range. The HID is particularly useful forFile Size: KB. Ionizing Collisions of Metastable Helium Atoms in Gases Journal Article Sholette, W.
; Muschlitz, E. - Journal of Chemical Physics Ionization cross sections for collisions of metastable 2 3 S and 2 1 S He atoms in Ar, Kr, Xe, H 2, O 2, N 2, and CO were measured using a thermal-energy atomic beam in which a fraction of the helium atoms.
miniPDD Helium Ionization Detector The newest member of the PDD family is also the smallest and thriftiest. The miniPDD uses about one fifth (20%) the amount of helium as the D-3 and D-4 versions, giving up only a bit of sensitivity and dynamic range in return.
Direct Detection of Inorganic Nitrate Salts by Ambient Pressure Helium-Plasma Ionization Mass Spectrometry Julius Pavlov and Athula B.
Attygalle * Center for Mass Spectrometry, Department of Chemistry, Chemical Biology, and Biomedical Engineering, Stevens Institute of Technology, Hoboken, New JerseyUnited States.
The principal circuit of a helium ionization detector with a thermionic electron emitter (He-IDTEE) is described. The detector works at atmospheric pressure. The characteristics of the detector were studied. The difference between the voltammetric characteristics of He-IDTEE and that of a helium ionization detector with a radioactive source was Author: Yu.
A. Saprykin, V. M. Tsmots, M. V. Tsyuper, Yu. A. Pazderskii.This was done by substituting ordinary commercial helium for argon as the carrier gas. The ionization chamber was a standard 1 cm. × 1 cm. microdetector which contained a mc. tritium source.Helium requires higher temperatures to ionize than hydrogen.
There is a weak dependence of the degree of ionization on the pressure (and hence the density) at a given temperature. These observations permit us to interpret the spectral sequence as primarily a temperature sequence, modified by small effects associated with the density.