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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >(HCN)m-Mn (M ) K, Ca, Sr): Vibrational Excitation Induced Solvation and Desolvation of Dopants in and on Helium Nanodroplets
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(HCN)m-Mn (M ) K, Ca, Sr): Vibrational Excitation Induced Solvation and Desolvation of Dopants in and on Helium Nanodroplets

机译:(HCN)m-Mn(M)K,Ca,Sr):振动激发诱导的氦纳米液滴中及其上掺杂物的溶解和去溶剂化

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摘要

Infrared (IR) laser spectroscopy is used to probe the rotational and vibrational dynamics of the (HCN)m-Mn (M ) K, Ca, Sr) complexes, either solvated within or bound to the surface of helium nanodroplets. The IR spectra of the (HCN)m-K (m ) 1-3), HCN-Sr, and HCN-Ca complexes have the signature of a surface species, similar to the previously reported spectra of HCN-M (M) Na, K, Rb, Cs) [Douberly, G. E.; Miller, R. E. J. Phys. Chem. A 2007, 111, 7292.]. A second band in the HCN-Ca spectrum is assigned to a solVated complex. The relative intesities of the two HCN-Ca bands are droplet s ize dependent, with the solvatedspecies being favored in larger droplets. IR-IR double resonance spectroscopy is used to probe the interconversion of the two distinct HCN-Ca populations. While only a surface-bound HCN-Sr species is initially produced, CH stretch vibrational excitation results in a population transfer to a solvated state. Complexes containing multiple HCN molecules and one Sr atom are surface-bound, while the ν1 (HCN)2Ca spectrum as both the solvated and surface-bound signatures. All HCN-(Ca,Sr)n (n g 2) complexes are solvated following cluster formation in the droplet. Density-functional calculations of helium nanodroplets interacting with the HCN-M show surface binding for M ) Na with a binding energy of 95 cm-1. The calculations predict a fully solvated complex for M ) Ca. For M ) Sr, a 2.2 cm-1 barrier is predicted between nearly isoenergetic surface binding and solvated states.
机译:红外(IR)激光光谱仪用于探测(HCN)m-Mn(M)K,Ca,Sr)配合物的旋转和振动动力学,这些配合物溶解或结合在氦纳米液滴的表面。 (HCN)mK(m 1-3),HCN-Sr和HCN-Ca配合物的红外光谱具有表面物种的特征,类似于先前报道的HCN-M(M)Na,K ,Rb,Cs)[加倍,GE; Miller,R.E.J.Phys。化学A 2007,111,7292.]。 HCN-Ca光谱中的第二个波段分配给溶剂化的复合物。两个HCN-Ca谱带的相对强度取决于液滴大小,其中较大的液滴更倾向于溶剂化物种。 IR-IR双共振光谱法用于探测两个不同的HCN-Ca群体的相互转化。虽然最初只产生表面结合的HCN-Sr物种,但CH拉伸振动激发导致种群转移到溶剂化状态。含有多个HCN分子和一个Sr原子的配合物是表面结合的,而ν1(HCN)2Ca光谱既是溶剂化的又是表面结合的标记。在液滴中形成簇之后,所有HCN-(Ca,Sr)n(n g 2)配合物均被溶剂化。与HCN-M相互作用的氦纳米滴的密度泛函计算显示M)Na的表面结合具有95 cm-1的结合能。该计算预测了M)Ca的完全溶剂化复合物。对于M)Sr,在几乎等能量的表面结合和溶剂化状态之间预计有2.2 cm-1的势垒。

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