一小段文献求翻译
The measured distance between the two nearest atom rows is 2.22A ̊, i.e., close to the (111) interplanar distance of Pd (2.25 A ̊ ). Rows of Pd atom can be observed on the surfaces of most Co@Pd particles, denoting the uniformity of the Pd shell. The Co@Pd nanoparticles consist of 34 mol% Pd and 66 mol% Co, determined by ICP-AES measure- ments, that is consistent with the expected Pd/Co molar ratio (33/67). On the basis of the particle’s size, composi- tion, and lattice parameters, and assuming that the parti- cles are spherical, the estimated thickness of the Pd shell was 0.54 nm, i.e., about 2.4 atomic layers.
主要是我想知道是怎么知道Pd壳有多厚的，求大神们赐教，谢谢了
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0.54纳米 约相当于2.4倍原子层
这个我看懂了，我不太明白前面是怎么得出来的这个结果？？？
On the basis of the particle’s size, composi- tion, and lattice parameters,应该是靠这一系列的数据计算的吧，
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On the basis of the particle's size [这里指Co@Pd这个核壳结构的颗粒大小(你的这个段落中没有提及，但是前文应该有)], composition [既是Pd/Co=34/66这个颗粒内的原子成分], and lattice parameters [2.22A这个提及的两排原子间的最近距离。这个距离被认为十分接近纯Pd晶体内Pd原子内最紧排列方向(111)上的间距，因此被暗示为核壳结构里Pd原子间的间距], and assuming that the particles are spherical [假设颗粒是球形], [这里开始你已经懂了] the estimated thickness of the Pd shell was 0.54 nm, i.e., about 2.4 atomic layers，