IR Spectroscopy of Fullerene Ions in a Cryogenic Quadrupole Trap
IR Spectroscopy of Fullerene Ions in a Cryogenic Quadrupole Trap
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低温四极杆陷阱中富勒烯离子的红外光谱
DOI：
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发表时间：
2018
影响因子：
4.9
通讯作者：
J. Roithová
中科院分区：
文献类型：
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作者：
D. Gerlich;J. Jašík;Dmitry V. Strelnikov;J. Roithová
本文报道了（n = 1-3）离子在1100 - 1600 cm-1范围内的气相红外光谱。用温度可变的射频离子阱仪器记录光谱。实验工作与质量选择的离子限制在一个线性线四极杆，在那里他们形成氦标记的复合物后，暴露于低温（低至2.3 K）和高密度氦缓冲气体。由于富勒烯笼的振动态之间的强耦合，所有测量的线均匀加宽。皮秒或以下的短寿命排除了高分辨率红外光谱的测量。距离在5到20 cm−1之间的可再现边带丰富了光谱。初步的解释是基于非线性和破键相互作用或可能是由于附加的He原子的影响。将光谱与的光谱进行比较，发现位移高达6 cm−1，而和的红外光谱非常相似。利用阱的谐振势将离子压缩到较窄的激光束中，提高了灵敏度，简化了绝对光吸收截面的测定。忽略几cm−1的位移，和的气相结果与以前的矩阵结果和理论预测一致。我们的结果的天体物理相关性简要提及。
This paper reports gas-phase IR spectra of (n = 1–3) ions in the range from 1100 to 1600 cm−1. The spectra were recorded with a temperature-variable radio frequency ion trap instrument. The experiments work with mass-selected ions confined in a linear wire quadrupole, where they form helium-tagged complexes following exposure to low-temperature (as low as 2.3 K) and high-density helium buffer gas. All measured lines are homogeneously broadened owing to a strong coupling between the vibrational states of the fullerene cage. The short lifetimes of picoseconds or below rule out measurements of high-resolution IR spectra. Reproducible sidebands with distances between 5 and 20 cm−1 enrich the spectra. Tentative explanations are based on nonlinear and symmetry-breaking interactions or may be due to the influence of the attached He atom. Comparison of the spectrum with that of reveals shifts up to 6 cm−1, while the IR spectra of and are very similar. With the harmonic potential of the trap the ions are squeezed into the rather narrow laser beam, increasing the sensitivity and simplifying the determination of absolute photoabsorption cross sections. Disregarding shifts of several cm−1, the gas-phase results for and are in agreement with previous matrix results and with theoretical predictions. The astrophysical relevance of our results is briefly mentioned.
HeâH 3 在 3 7 K 离子阱中的受控合成和分析
影响因子：
1.7
作者：
I. Savic;D. Gerlich;O. Asvany;P. Jusko;S. Schlemmer
通讯作者：
S. Schlemmer