高温气体中的激光击穿效应
The effect of laser induced breakdown in hot atomic oxygeng gas
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摘要: 通过对电子能量分布函数所满足的Boltzmann方程的求解，得到了高温氧原子气体中激光产生电离击穿效应时的束流强度阈值。这一阈值远小于在低温氧分子气体中产生电离击穿的阈值，最多可相差两个数量级。导致这一现象出现的主要原因是原子和分子的能级分布和激发自由度有很大的差别。
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关键词:
- 激光 /
- 大气击穿 /
- Boltzmann方程 /
- 阈值 /
- 自由度
Abstract: The threshold of laser induced breakdown in high temperature atomic oxygen gas is obtained by solving quantum Boltzmann equation for electrons numerically. This threshold is much more smaller than that in low temperature molecular gas. The reason is that in the high temperature gas, the distribution of energy level and the degree of freedom is much more different from that in molecular gas. The vibrational excitation of molecule in molecular gas dose not exist in atomic gas, which reduces the energy loss of electrons and increases ionization rate.-
Key words:
- laser /
- gas breakdown /
- boltzmann equation /
- threshold /
- degree of freedom
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