Spectroscopic application of few-femtosecond deep-ultraviolet laser pulses from resonant dispersive wave emission in a hollow capillary fibre.
Spectroscopic application of few-femtosecond deep-ultraviolet laser pulses from resonant dispersive wave emission in a hollow capillary fibre.
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DOI：
10.1039/d2sc02185d
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发表时间：
2022-08-24
期刊：
影响因子：
8.4
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中科院分区：
文献类型：
--
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利用充气中空毛细管纤维（HCFs）中的共振色散波（RDW）发射现象，实现了时间分辨光电子成像（TRPEI）测量。通过将HCF的输出端直接集成到真空室组件中，我们展示了在250和280 nm的中心泵浦波长处仅为10和11 fs的双色深紫外（DUV）-红外仪器响应函数。这一结果代表了超快光电子能谱技术的一个进步。我们还提出了一个初步的TRPEI测量调查的激发态光化学动力学操作的N-甲基吡咯烷分子。鉴于对许多先进光谱应用产生极短且高度可调的DUV脉冲的浓厚兴趣，我们预计我们的首次演示将刺激更广泛地采用基于RDW的新方法来研究超快光化学-特别是考虑到HCF设置的相对紧凑和简单的性质。我们利用充气中空毛细管纤维中的共振色散波发射现象，实现了时间分辨的光电子成像测量与极短的时间分辨率。
We exploit the phenomenon of resonant dispersive wave (RDW) emission in gas-filled hollow capillary fibres (HCFs) to realize time-resolved photoelectron imaging (TRPEI) measurements with an extremely short temporal resolution. By integrating the output end of an HCF directly into a vacuum chamber assembly we demonstrate two-colour deep ultraviolet (DUV)-infrared instrument response functions of just 10 and 11 fs at central pump wavelengths of 250 and 280 nm, respectively. This result represents an advance in the current state of the art for ultrafast photoelectron spectroscopy. We also present an initial TRPEI measurement investigating the excited-state photochemical dynamics operating in the N-methylpyrrolidine molecule. Given the substantial interest in generating extremely short and highly tuneable DUV pulses for many advanced spectroscopic applications, we anticipate our first demonstration will stimulate wider uptake of the novel RDW-based approach for studying ultrafast photochemistry – particularly given the relatively compact and straightforward nature of the HCF setup. We exploit the phenomenon of resonant dispersive wave emission in gas-filled hollow capillary fibres to realize time-resolved photoelectron imaging measurements with an extremely short temporal resolution.
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