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首页> 外文期刊>RSC Advances >A helium nanodroplet setup for mid and far-infrared spectroscopy using pulsed-free-electron lasers: vibrational spectra of propargyl alcohol
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A helium nanodroplet setup for mid and far-infrared spectroscopy using pulsed-free-electron lasers: vibrational spectra of propargyl alcohol

机译：使用脉冲自由电子激光的中纳米和远红外光谱的氦纳米液滴设置：炔丙醇的振动光谱

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Our microscopic understanding of intermolecular interactions has increased considerably from the studies on isolated molecular clusters. The intermolecular modes for these clusters are located in far-infrared and terahertz regions and provide a sensitive test of the potential energy surface. Here we report a helium droplet setup (BoHeNDI@FELIX), which is coupled with free electron lasers, FEL-I and FEL-II, at the FELIX laboratory in Nijmegen. These lasers provide tunable radiation in the range of 66–3600 cm?1, covering the intermolecular modes, with average output power of 0.1–0.8 W and spectral bandwidth of 0.2–5% of the central frequency. Mass-selective infrared spectra of propargyl alcohol were recorded in the frequency range of 560–1600 cm?1, which demonstrate the performance of the new setup. The observed vibrational bands could be assigned to the gauche conformer of propargyl alcohol. The high power and micropulse structure of the FELIX radiation allow multiple excitations of the embedded molecules allowing spectral detection with a signal to noise of 10, even in the low-frequency region.
机译：通过对孤立分子簇的研究，我们对分子间相互作用的微观理解有了很大的提高。这些簇的分子间模式位于远红外和太赫兹区域，并提供了对势能面的灵敏测试。在这里，我们报告了位于奈梅亨的FELIX实验室的氦滴装置（BoHeNDI @ FELIX），该装置与自由电子激光器FEL-I和FEL-II耦合。这些激光器提供了66–3600 cm ？1 范围内的可调辐射，涵盖了分子间模式，平均输出功率为0.1-0.8 W，光谱带宽为0.2-中心频率的5％。在560–1600 cm ？1 的频率范围内记录了炔丙醇的质谱选择性红外光谱，证明了新装置的性能。可以将观察到的振动带分配给炔丙醇的 gauche 构象异构体。 FELIX辐射的高功率和微脉冲结构允许对嵌入分子进行多次激发，从而即使在低频区域也能以10的信噪比进行光谱检测。

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