LIBS Info: Element Analysis

Title Authors Material Detector Spectrometer Software
Chlorine detection in cement with laser-induced breakdown spectroscopy in the infrared and ultraviolet spectral range Christoph Dominic Gehlen, Eugen Wiens, Reinhard Noll, G. Wilsch, Kenji Reichling Concrete or Cement Photomultiplier Paschen-Runge Spectrometer
Laser: Nd:YAG
Gate Delay: 0.100us
Gate Width: 10.000us
Both the IR Cl peak at 837.59nm and the UV peak at 134.72nm are investigate for their ability to detect Chlorine in concrete. Measurements are performed in a sample chamber which can be filled with He gas - to improve the detection limits by the use of a buffer gas, and to reduce the UV absorption that would occur in air. Interestingly the Cl peak intensity as a function of He gas pressure was different for the IR compared to the UV peak. Single and Double Pulse LIBS are compared.
Element Detection Limit (ppm) Wavelength (nm) Other Wavelengths (nm) Calibration Method Calibration Range (ppm) Notes
Cl 1000.0000 (Calibration Curve Slope) 134.7200 N/A Univariate 500.0000-40000.0000 Helium atmosphere. Peak intensity ratioed to Background at 861nm
Cl 2300.0000 (Calibration Curve Slope) 134.7200 N/A Univariate 500.0000-40000.0000 60mbar Helium atmosphere. DP LIBS result, however this is not as good as the single pulse LIBS LOD.

Element RMSE (ppm) Wavelength (nm) Calibration Method Notes