Mars analysis by laser-induced breakdown spectroscopy (MALIS): Influence of mars atmosphere on plasma emission and study of factors influencing plasma emission with the use of Doehlert designs
Mars analysis by laser-induced breakdown spectroscopy (MALIS): Influence of mars atmosphere on plasma emission and study of factors influencing plasma emission with the use of Doehlert designs
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DOI：
10.1366/000370203322102816
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发表时间：
2003-07-01
影响因子：
3.5
通讯作者：
Maurice, S
中科院分区：
文献类型：
--
作者：
Brennetot, R;Lacour, JL;Maurice, S
一个名为MALIS（用激光诱导击穿光谱法进行火星分析）的项目正在进行中，目的是对火星土壤和岩石进行现场分析。本文报告了火星条件下等离子体的行为，即，在CO2气氛中在5和12毫巴之间的压力下。等离子体的膨胀和寿命进行了研究，以比较标准条件下（大气压力下的空气）和火星大气中的等离子体演化。我们已经表明，火星环境有利于等离子体膨胀和寿命。研究的第二部分涉及等离子体发射信号的优化。一个原始的方法已经被选择，因为我们使用了Doehlert设计的第一次在激光诱导击穿光谱（LIBS）。获得的最佳条件是激光波长为1064 nm，由于空间限制，最大能量为40 mJ，15 Hz。研究的其他因素是延迟，入射角和CO2压力。我们已经表明，这些因素不具有相同的影响，这取决于使用哪条光谱线，即，原子线或离子线。
A project called MALIS (Mars Analysis by Laser-Induced breakdown Spectroscopy) is under progress to perform in situ analysis of Mars soils and rocks. This paper reports on the behavior of plasma in Martian conditions, i.e., in a CO2 atmosphere at pressures between 5 and 12 mbar. Plasma expansion and lifetime have been studied in order to compare plasma evolution under standard conditions (air at atmospheric pressure) and in a Mars atmosphere. We have shown that the Mars environment favors plasma expansion and lifetime. The second part of the study concerns optimization of the emission signal from the plasma. An original approach has been chosen, as we used a Doehlert design for the first time in laser-induced breakdown spectroscopy (LIBS). The best conditions obtained are for a laser wavelength of 1064 nm with the maximum energy available due to space limitations, which is 40 mJ at 15 Hz. The other factors studied are delay, angle of incidence, and CO2 pressure. We have shown that these factors do not have the same influence depending on which spectroscopic line is used, i.e., the atomic line or the ionic line.