The effects of cavity diameter and material type of spatial confinement on intensity of laser-induced breakdown spectroscopy

Abstract

In this paper, we have investigated the spatial confinement effects on the spectrum intensity of tungsten plasma generated by laser-induced breakdown spectroscopy in the near-vacuum environment. The enhancement effects that vary with the diameters of the spatial confinement cylinders and with the material type are analyzed. We find that for an Al cylinder, the enhancement factor o reaches its highest value at diameter 4mm. The primary causes behind this finding are attributed to the influences of diameter on the bounce time of shock wave propagating in the plasma as well as on the available range of spectrum collection. Moreover, the enhancement effect of Al cylinder is better than the other four types of materials: ZrO2, Al2O3, Fe and Cu. For each of the latter four types of materials, the thermal conductivity plays a major role on the enhancement effect, whereas for Al the enhancement effect is mainly due to its extremely large reflectivity. Particularly, for cavity with a diameter of 4 mm made of Aluminum, the maximum of the enhancement factor can approximately reach as high as 15. These experimental results indicate that the signal intensity of laser-induced breakdown spectroscopy can be dramatically improved by appropriately selecting diameter and material type of the cylindrical cavity.

Detection of zinc in pig feed based on the cavities of different shapes combined with LIBS

“…Therefore, the spatial confinement LIBS-based method is widely used in applications. The constraints include parallel plate constraint [19] or flat mirror constraint [20], cylindrical constraint [21], and conical constraint [22] or hemispherical constraint [23]. The spatial constraints on the plasma range from one dimension to two dimensions to three dimensions, with higher dimensional constraint resulting in more enhancement.…”

Elemental analysis of liquid samples by nanoparticle-enhanced laser-induced breakdown spectroscopy: using ordered nano-arrays with a tunable nanoparticle size and inter-particle distance

“…7 Compared with other traditional elemental analytical methods, such as inductively coupled plasma mass spectrometry (ICP-MS), inductively coupled plasma optical emission spectroscopy (ICP-OES), and atomic absorption spectroscopy (AAS), LIBS presents signicant advantages in terms of speed of analysis and not requiring complex sample pretreatment. 8 To enhance the sensitivity of LIBS, researchers have proposed various strategies, including double-pulse LIBS, 9 spark-discharge LIBS, 10 LIF-LIBS, 11 spatial or magnetic connement 12,13 and NELIBS. [14][15][16][17] In these approaches, NELIBS can greatly enhance signal intensity with simple sample preparation, making it a promising analytical method.…”