Effect of argon pressure on spectral emission of a plasma produced by a laser microprobe

Use of the vacuum ultraviolet spectral region for laser-induced breakdown spectroscopy-based Martian geology and exploration

“…We approximated the Mars atmosphere by using CO 2 at 7 torr, slightly above the midrange of seasonal pressure variations measured at the Viking landing sites [25]. Although the ablation and excitation characteristics of the laser plasma change significantly with pressure [26][27][28][29], the minor gases are expected to have a negligible effect on plasma properties and hence the analytical results.…”

Pressure Effect on Self-absorption in Analysis of a Copper in Brass by Laser Microprobe Analyzer.

“…Particulary, in some cases where elements to be determined are at high concentrations, self-reversal occurs and quantitative analysis becomes impossible. In our previous papers8, 9), we, using a normal (free-running) laser microprobe, have shown that a reduced pressure argon atmosphere was effective for the reduction of self-absorption and that a linear calibration curve with a slope of unity was obtained for the determination of copper in aluminum samples up to a concentration of about 10% under a pressure of around 200 hPa. The results suggested the possibility of determining a major sample component.…”

Laser-induced breakdown spectroscopy for space exploration applications: Influence of the ambient pressure on the calibration curves prepared from soil and clay samples

“…Here in-situ corresponds to a close distance of several centimeters in contrast to stand-off analysis at many meters distance. This characterization is important because the excitation properties of the LIBS plasma are strongly dependent on the pressure of the surrounding atmosphere, which can have a strong effect on the detection of elements in a solid [3][4][5][20][21][22][23][24][25][26][27][28][29]. We studied the influence of the ambient pressure on calibration curves prepared using certified soil and clay pellets containing elements commonly observed in terrestrial soils (e.g.…”