The amount of ionization produced in a laser-matter interaction provides critical information in studying strong field physics and attosecond science. The amount of ionization can be accurately measured in vacuum using a photoelectron/ion spectrometer by counting the number of charged particles. However, an ionization yield measurement in ambient air requires the considerations of post processes such as drift and recombination of charged particles, which may add an unwanted nonlinearity to the measurement. Here we investigate the kinetics of the charged particles after optical field ionization in ambient air under a static bias field. A simple kinetic model is used in which coupled rate equations are numerically solved. The kinetic model explains the recombination loss of the charged particles observed in ionization yield measurements. A condition for the static bias field is derived for an accurate ionization yield measurement.

中文翻译：

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使用环境空气中带有静电场的金属电极测量电离率

激光物质相互作用中产生的电离量为研究强场物理学和阿秒科学提供了关键信息。可以使用光电子/离子光谱仪在真空中通过对带电粒子的数量进行计数来准确地测量电离量。但是，环境空气中电离产率的测量需要考虑后处理，例如漂移和带电粒子的复合，这可能会增加测量的不必要的非线性。在这里，我们研究在静态偏置场下环境空气中光场电离后带电粒子的动力学。使用简单的动力学模型，在该模型中，数值求解了耦合速率方程。动力学模型解释了在电离产率测量中观察到的带电粒子的重组损失。