Horiba Jobin Yvon Sas

Ionwerks, Inc.

Agnes Tempez

Thomas F Egan

J Albert Schultz

Michael V Ugarov

Valeri V Raznikov

Michael Ugarov

Patrick Chapon

Sebastien Legendre

Mihai Ganciu-Petcu

Virgil Mircea Udrea

Olivier Rogerieux

Albert J Schultz

Serge Della University Paris Sud Negra

Yvon University Paris Sud Le Bayec

A system and a process for measuring, by glow discharge spectrometry, the elemental and/or molecular chemical composition of an organic solid sample (). The sample () is positioned so as to seal a glow discharge plasma reactor (), a gaseous mixture including at least one inert gas and gaseous oxygen is injected into the reactor (), the concentration of gaseous oxygen being between 0.1% and 15% by weight of the gaseous mixture, an electric discharge of radiofrequency type is applied to the electrodes of the plasma reactor () in order to generate a glow discharge plasma, and the solid sample () is exposed to the plasma so as to etch an erosion crater in the solid sample (); at least one signal representative of an ionized species of negative charge is selected and measured using a mass spectrometer ().

Process and apparatus for measuring an organic solid sample by glow discharge spectrometry

A glow discharge spectrometer discharge lamp includes: a lamp body having a vacuum enclosure connected to pump elements and to injector elements for injecting an inert gas into the enclosure; a hollow cylindrical first electrode of longitudinal axis X-X'; a second electrode for receiving a sample for analysis and for holding the sample facing one end of the cylindrical electrode; electric field generator including an applicator for applying to the terminals of the electrodes an electric field that is continuous, pulsed, radiofrequency, or hybrid, and suitable for generating a glow discharge plasma in the presence of the gas; coupler elements for coupling the discharge lamp to a spectrometer suitable for measuring at least one component of the plasma; and magnetic field generator elements for generating a magnetic field having field lines oriented along the axis X-X&#x2032;, the magnetic field being uniform in orientation and in intensity over an area of the sample that is not less than the inside area of the hollow cylindrical electrode as projected along the direction X-X&#x2032;.

Discharge lamp for GDS with an axial magnetic field

The present invention relates to a device for measuring glow discharge spectrometry in pulsed mode, which includes an RF electric field generator in pulsed mode, a discharge lamp, an impedance matching device for transferring the electric power supplied by the generator to the discharge lamp and a mass spectrometer suitable for measuring at least one signal representative of an ionised plasma species. According to the invention, the device includes a measurement system suitable for measuring a signal representative of the impedance mismatch &#x394;&#x3a9; between the generator and the discharge lamp, said measurement system including a fast acquisition system, synchronized with the pulses and suitable for supplying the impedance matching device with a signal representing the impedance mismatch &#x394;&#x3a9; for at least one part of said pulses. The device enables continuous impedance adaptation.

Method and device for measuring glow discharge spectrometry in pulsed mode

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Massy, France

Agnes Tempez