Glow Discharge Spectrometer operator swaps lamp

GDS950Extended Range Glow Discharge Atomic Emission Spectrometer

Our GDS950 Glow Discharge Spectrometer (GDS) offers state-of-the-art technology designed specifically for routine elemental determination and compositional depth profiling in most electrically conductive and non-conductive solid matrices. User-friendly Cornerstone brand software is brought to the platform for increased usability, simplified reporting, and streamlined analysis times—saving you time in your lab.

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Características

The glow discharge source brings a number of advantages, including:

  • Calibrações lineares simples quando comparadas a outras fontes
  • Excitação controlada que ocorre longe da superfície da amostra
  • Consumo reduzido do material de referência
  • Automatic cleaning between analyses saves time and minimizes matrix effects for increased analytical performance

The detection system ensures stability, flexibility, and performance, with the following specifications:

  • Full wavelength coverage from 120 nm to 460 nm
  • 30 pm (0.030 nm) resolution to differentiate even the most complex features of bulk spectra

Optional CDP Analysis Support is available.

  • Compositional depth profiling of solid electrically conductive samples
  • Ideal for plating, galvanizing, cladding, and other conductive surface treatments

Cornerstone software provides simplified analysis and reporting.

Aplicações

The GDS950 is ideal for bulk elemental determination in metals or other solid materials like steel, cast iron, titanium, and other metals. When equipped with the CDP option, it expands the capability to compositional depth profile analysis of surface features like galvanizing, plating, heat treatments, and cladding. Application capabilities are further expanded with the DC/RF lamp option, which expands both bulk and CDP to include solid electrically non-conductive materials like paint, glass, plastics, and more.

Teoria de operação

A espectrometria de descarga luminescente (GDS) é um método analítico para determinação direta da composição elementar de amostras sólidas. A prepared flat sample is mounted on the glow discharge source, and then the source is evacuated and backfilled with Argon. Um campo elétrico constante é aplicado entre a amostra (cátodo) e o corpo eletricamente aterrado da lâmpada (ânodo). Essas condições resultam na formação espontânea de uma descarga estável e autossustentada, que é chamada de descarga luminescente.

The applied current is regulated by the power supply and the lamp voltage is held constant through regulation of the Argon pressure. As soon as the plasma is initiated, inert gas ions formed in the plasma are accelerated by the electric field toward the cathode. Por meio de um processo chamado pulverização catódica, a energia cinética é transferida dos íons do gás inerte para os átomos na superfície da amostra, o que faz com que alguns desses átomos da superfície sejam ejetados no plasma.

Instrument models equipped with the Radio Frequency (RF) option use radio frequency energy (instead of direct current) to generate the glow discharge. LECO’s proprietary True Plasma Power algorithm is used to correct for radiated and reflected power losses. True Plasma Power improves the ability of RF-equipped models to perform both quantitative bulk analysis and quantitative depth profile analysis for electrically conductive and electrically non-conductive samples.

Once the atoms are ejected into the plasma, they are subject to inelastic collisions with energetic electrons or metastable Argon atoms. A energia transferida por tais colisões faz com que os átomos pulverizados fiquem eletricamente excitados. Os átomos excitados rapidamente relaxam para um estado de menor energia por meio da emissão de fótons. O comprimento de onda de cada fóton é determinado pela configuração eletrônica do átomo do qual foi emitido. Como cada elemento possui uma configuração eletrônica única, os elementos podem ser identificados por sua assinatura espectroquímica exclusiva ou pelo espectro de emissão.

Um espectrômetro é usado para medir os sinais de emissão da descarga luminescente. To ensure that the media within the spectrometer is transparent to ultra-violet and visible light (120-460 nm), the entire optical system is purged with Argon. Photosensitive Charge-Coupled Device (CCD) arrays are positioned at the focal plane in such a manner that the complete emission spectrum is recorded from 120 to 460 nm.

As matrizes CCD convertem o espectro em um sinal elétrico, que é digitalizado e processado para remover o sinal da corrente escura, normalizar a resposta do pixel, estender a faixa dinâmica e eliminar a pixelização. Como o número de fótons emitidos por cada elemento é proporcional à sua concentração relativa na amostra, as concentrações do analito podem ser deduzidas por calibração, com amostras de referência de composição conhecida.

GDS950 Glow Discharge Spectrometer with two monitors
Modelos

GDS950 glow discharge spectrometers can be fitted with a variety of options depending on the type of analysis desired, the sample type(s), and the environment in which the system is installed.  Choices include:

Glow Discharge Lamp

  • DC only for solid electrically conductive samples
  • A combination DC/RF lamp for both electrically conductive and non-conductive solid samples

Analysis Software Support

  • Bulk only, for the determination of bulk elemental composition
  • Bulk and CDP, for both the determination of bulk elemental composition, and compositional depth profiling

Spectrometer Extension

  • Choice to add an extension spectrometer, to expand the upper wavelength range from 450 to 850 nm

Vacuum Pump Type

  • Rotary vane pump for standard lab environments
  • Dry Roots pump for oil sensitive lab environments like clean rooms
Accessories
  • Mesa integrada ou estação de trabalho móvel
  • High purity Gas Regulators
  • Compartimento de redução de som da bomba de vácuo
Instrument Brochure(s)
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