Department of Chemistry, University of Leicester, University Road, Leicester, LE1 7RH, UK.
Phys Chem Chem Phys. 2011 Aug 21;13(31):13920-5. doi: 10.1039/c1cp20653b. Epub 2011 May 18.
Core-shell particles with water clusters as the core and surrounded by an atomic or molecular shell have been synthesized for the first time by adding water and a co-dopant sequentially to helium nanodroplets. The co-dopants chosen for investigation were Ar, O(2), N(2), CO, CO(2), NO and C(6)D(6). These co-dopants have been used to investigate the effect of an outer shell on the ionization of the core material by charge transfer in helium nanodroplets. The specific aim was to determine how the identity of the shell material affects the fragmentation of water cluster ions, i.e. whether it helps to stabilize parent ion ((H(2)O)(n)(+)) formation or increases fragmentation (to form (H(2)O)(n)H(+)). N(2), O(2), CO(2) and C(6)D(6) all show a marked softening effect, which is consistent with the formation of a protective shell around the water cluster core. For CO and NO co-dopants, the response is complicated by secondary reactions which actually favour water cluster ion fragmentation for some water cluster sizes.
首次通过向氦纳米液滴中顺序添加水和共掺杂剂，合成了以水团簇为核、原子或分子壳包围的核壳粒子。选择的共掺杂剂为 Ar、O(2)、N(2)、CO、CO(2)、NO 和 C(6)D(6)。这些共掺杂剂用于通过氦纳米液滴中的电荷转移研究外壳对核材料电离的影响。具体目的是确定外壳材料的特性如何影响水团簇离子的碎片化，即它是否有助于稳定母体离子((H(2)O)(n)(+))的形成或增加碎片化（形成 (H(2)O)(n)H(+))。N(2)、O(2)、CO(2)和 C(6)D(6)都表现出明显的软化效应，这与水团簇核周围形成保护性壳一致。对于 CO 和 NO 共掺杂剂，由于次级反应的复杂性，对于某些水团簇尺寸，实际上有利于水团簇离子的碎片化。
