Töpfer Matthias, Jensen Anders, Nagamori Keigo, Kohguchi Hiroshi, Szidarovszky Tamás, Császár Attila G, Schlemmer Stephan, Asvany Oskar
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, D-50937 Köln, Germany.
Department of Chemistry, Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan.
Phys Chem Chem Phys. 2020 Oct 21;22(40):22885-22888. doi: 10.1039/d0cp04649c.
Using two different action spectroscopic techniques, a high-resolution quantum cascade laser operating around 1300 cm-1 and a cryogenic ion trap machine, the proton shuttle motion of the cations HHe2+ and HHe3+ has been probed at a nominal temperature of 4 K. For HHe3+, the loosely bound character of this complex allowed predissociation spectroscopy to be used, and the observed broad features point to a lifetime of a few ps in the vibrationally excited state. For He-H+-He, a fundamental linear molecule consisting of only three nuclei and four electrons, the method of laser-induced inhibition of complex growth (LIICG) enabled the measurement of three accurate rovibrational transitions, pinning down its molecular parameters for the first time.
利用两种不同的行动光谱技术，即一台工作在1300厘米-1附近的高分辨率量子级联激光器和一台低温离子阱装置，在4K的标称温度下对阳离子HHe2+和HHe3+的质子穿梭运动进行了探测。对于HHe3+，该复合物的松散结合特性使得预解离光谱得以应用，观察到的宽峰特征表明其在振动激发态的寿命为几皮秒。对于He-H+-He，这个仅由三个原子核和四个电子组成的基本线性分子，激光诱导抑制复合物生长（LIICG）方法实现了对三个精确的振转跃迁的测量，首次确定了其分子参数。
