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I have seen elements with a number in parentheses after them in literature, but cannot find what it means. What does the number in parentheses after an element represent, such as in W(100) or Mo(110)?

https://aip.scitation.org/doi/abs/10.1063/1.1727919 https://www.sciencedirect.com/science/article/pii/0039602880900886

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    $\begingroup$ Something like this? aip.scitation.org/doi/abs/10.1063/1.1727919 "The interaction of hydrogen with a single‐crystal tungsten (100) surface has been studied" $\endgroup$ Jun 12, 2018 at 16:14
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    $\begingroup$ It refers to the crystalline plane which forms the surface. $\endgroup$
    – MaxW
    Jun 12, 2018 at 16:42

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These are called Miller indices and they identify a particular surface of a crystal. (You can form different faces by cutting the crystal in different ways.) When you see something like "Mo(110)" it means "the 110 surface of a crystal of molybdenum."

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    $\begingroup$ An explanation of what miller indices are would probably help a bit (even if you don't get too technical). $\endgroup$
    – matt_black
    Jun 13, 2018 at 8:55

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