EDAX Lambda WDS Spectrometers

EDAX Lambda wavelength dispersive spectroscopy (WDS) spectrometers offer advanced accuracy and precision, ensuring optimal findings for materials analysis. The EDAX Neptune and Trident analysis systems contain Lambda spectrometers, which considerably improve the accuracy of results by resolving energy dispersive X-Ray spectroscopy (EDS) peak overlaps, increasing the minimum detection limit by 10×, and enabling precise quantification.

The Lambda spectrometers are designed for parallel beam operation and are available in models:

  • EDAX Lambda Plus: Polycapillary optics provide optimal efficiency for transition element energies ranging from 150 eV to 10 keV (B Kα to Ge Kα)
  • EDAX Lambda Super: Combines polycapillary optics with proprietary dual optics design to deliver the highest efficacy for light elements, particularly B, C, N, and O, employing high-collection, reflecting X-Ray optics

Scanning Modes

Every element in the periodic table has at least one X-Ray line that can be covered by the Lambda spectrometers, which can scan the whole energy range. Options for scanning modes include:

  • Automatically acquiring one or more elements
  • The flexibility to adapt the scan range to any particular application
  • User-selectable step size and speed
  • Peak and background modes for a selection of elements
    • Describe elements using an intuitive periodic table interface
    • The software suggests diffractor, peak, and background positions

Overlap of Si K and W M lines are easily resolved using WDS instead of EDS.

Figure 1. Overlap of Si K and W M lines are easily resolved using WDS instead of EDS. Image Credit: Gatan, Inc.

Qualitative and Quantitative Analysis

Users can obtain both quantitative and qualitative measurements using the EDAX APEX software with Smart Quant. For easy qualitative confirmation, gather and overlay WDS and EDS data simultaneously. The analyst could choose between EDS and WDS techniques to quantify a desired element to increase detection limits and precision.

Features and Benefits

Compact Design

  • Compatible with every scanning electron microscope (SEM) chamber that has a high-angle port
  • Installs on a standard EDS port; no special chamber or port is needed


  • Combines a compact design with X-Ray optics to provide exceptional count rates

High Count Rates and Peak-to-Background Ratios

  • Quick X-Ray analysis with the highest quality possible
  • Exceptional resolution of the K lines of transition elements
  • Capable of resolving most elemental overlaps

Ease of Alignment

  • Automated processes enhance the operation, performance, and accuracy of data

Seamless Integration with EDS and Easy-to-Use APEX Software

  • Intuitive operation for EDS and WDS users
  • Enhanced X-Ray microanalysis
  • Covers the entire periodic table

C in SiC showing superior resolution of WDS compared to EDS.

Figure 2. C in SiC shows superior resolution of WDS compared to EDS. Image Credit: Gatan, Inc.

Smart Focus

The APEX software has a feature called Smart Focus routine. To maximize the spectrometer’s performance, the automated method modifies the sample height to focus the WDS signal.

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