Quiros Nancy, Tariq Naima, Tscherbul Timur V, Kłos Jacek, Weinstein Jonathan D
Department of Physics, University of Nevada, Reno, Nevada 89557, USA.
Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA.
Phys Rev Lett. 2017 May 26;118(21):213401. doi: 10.1103/PhysRevLett.118.213401.
We have used laser ablation and helium buffer-gas cooling to produce titanium-helium van der Waals molecules at cryogenic temperatures. The molecules were detected through laser-induced fluorescence spectroscopy. Ground-state Ti(a^{3}F_{2})-He binding energies were determined for the ground and first rotationally excited states from studying equilibrium thermodynamic properties, and found to agree well with theoretical calculations based on newly calculated ab initio Ti-He interaction potentials, opening up novel possibilities for studying the formation, dynamics, and nonuniversal chemistry of van der Waals clusters at low temperatures.
我们利用激光烧蚀和氦缓冲气体冷却在低温下制备了钛-氦范德瓦尔斯分子。通过激光诱导荧光光谱法对这些分子进行了检测。通过研究平衡热力学性质，确定了基态Ti(a³F₂)-He在基态和第一转动激发态下的结合能，发现其与基于新计算的从头算Ti-He相互作用势的理论计算结果吻合良好，为研究低温下范德瓦尔斯团簇的形成、动力学和非通用化学开辟了新的可能性。
