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首页> 外文期刊>Nuclear Instruments & Methods in Physics Research. B, Beam Interactions with Materials and Atoms >Nucleation and growth of Ag clusters in silicate glasses under ion irradiation
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Nucleation and growth of Ag clusters in silicate glasses under ion irradiation

机译：离子辐照下硅酸盐玻璃中银团簇的形核和生长

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摘要

The processes of nucleation and growth of silver clusters under ion irradiation are investigated respectively in ion-exchanged glasses containing no clusters and in sputtered films, in which all the metal is precipitated before the irradiation. The studied samples were irradiated with He or Au ions of energy in the range of 1-100 MeV and the yields of precipitation or growth were assessed by combining measurements of luminescence and of optical absorption. The two processes result from electronic excitations and the nuclear collisions have insignificant effect. The nucleation rate is proportional to the product of the reduction cross section of Ag~+ ions by the ion fluence and the process involves the transient formation of Ag_3~(2+) ions. Ag atoms must be released from clusters in order to permit the growth of some others in a matrix free of solute atoms (sputtered films) and this desorption is the stage limiting the growth rate. The desorbed atoms remain in solid solution when the density of electronic excitations exceeds a threshold value.
机译：分别在无团簇的离子交换玻璃和溅射膜中研究了在离子辐照下银团簇的形核和生长过程，其中所有金属均在辐照前沉淀。用能量在1-100 MeV范围内的He或Au离子辐照研究的样品，并结合发光和光吸收的测量值评估沉淀或生长的产量。这两个过程是由电子激发引起的，核碰撞的影响很小。成核速率与离子通量与Ag〜+离子的还原截面乘积成正比，该过程涉及Ag_3〜（2+）离子的瞬态形成。 Ag原子必须从团簇中释放出来，以便允许其他一些原子在不含溶质原子的基质（溅射膜）中生长，并且这种解吸是限制生长速率的阶段。当电子激发的密度超过阈值时，解吸的原子保留在固溶体中。

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