Molecular tagging velocimetry is typically species specific and limited by excited state/species lifetimes. We utilize laser-generated ionization, long-lived anions, and a time-delayed microwave pulse to monitor the tagged region up to several milliseconds. This non-resonant excitation and microwave interaction is demonstrated in a range of gas mixtures. Signal levels show up to 1000-fold improvement, and the flexibility in interrogation time allows for velocity measurements over a large dynamic range (1–100 m/s) with single-shot precision of <5%. This approach has the potential for wide application over a range of relevant gas compositions, temperatures, and pressures.

中文翻译：

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用于高度灵活测速的飞秒激光标记的微波再激发

分子标记测速通常是物种特异性的，并受到激发态/物种寿命的限制。我们利用激光产生的电离、长寿命阴离子和延时微波脉冲来监测标记区域长达几毫秒。这种非共振激发和微波相互作用在一系列气体混合物中得到了证明。信号水平提高了 1000 倍，询问时间的灵活性允许在大动态范围 (1–100 m/s) 内进行速度测量，单次精度 <5%。这种方法具有在一系列相关气体成分、温度和压力下广泛应用的潜力。