Chapter 2 Multiple Choice Questions

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. Which of the following space groups is not a sub-group of the p6mm space group?

p2mg correct incorrect

p2mm correct incorrect

p4 correct incorrect

p1g correct incorrect

p31m correct incorrect

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. A certain reconstructed surface conforms to the c1m space group. Which of the following space groups could not have been that of the unreconstructed surface?

p4gm correct incorrect

p1m correct incorrect

p2mm correct incorrect

p3m1 correct incorrect

p6 correct incorrect

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. The (421) surface of a face-centred cubic crystal has a primitive unit cell (not necessarily the most symmetric primitive unit cell) spanned by the vectors $\left(a/2\right)\left[\overline{1}12\right]$ and $\text{a}\left[1\overline{2}0\right]$ (where the vector components are defined relative to the same three orthogonal unit vectors used in defining the surface's Miller indices). What is the nature of its real-space lattice?

Oblique correct incorrect

Triangular correct incorrect

Rectangular correct incorrect

Square correct incorrect

Rhombic correct incorrect

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. If the metallic radius of a gold atom is 1.44 Å, and if the regular atomic-scale steps on its {311} surface are spaced at a perpendicular distance of 4.78 Å, what is the area of that surface's primitive unit cell?

13.77 Ų correct incorrect

14.61 Ų correct incorrect

17.05 Ų correct incorrect

19.47 Ų correct incorrect

27.53 Ų correct incorrect

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. Given a face-centred cubic crystal, which of these high-index surfaces exhibits a regular array of straight-edged atomic-scale steps in their ideal structure?

{421} correct incorrect

{332} correct incorrect

{210} correct incorrect

{531} correct incorrect

{643} correct incorrect

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. At its densest single-layer packing on Ni{111}, benzene forms a $\left(\sqrt{7}\times \sqrt{7}\right)\text{R}{19.1}^{\circ }$ superstructure featuring one molecule per corresponding primitive unit cell. When coadsorbed with carbon monoxide, however, a $\left(2\sqrt{3}\times 2\sqrt{3}\right)\text{R}{30}^{\circ }$ superstructure is formed instead. What is the most plausible surface coverage of benzene in this latter case?

0.05 ML correct incorrect

0.08 ML correct incorrect

0.17 ML correct incorrect

0.25 ML correct incorrect

0.33 ML correct incorrect

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. Which of these superstructures (for any given crystalline surface) has the largest primitive surface unit cell?

(2, 1; $\overline{1}$, 2) correct incorrect

(2, 1; 2, 2) correct incorrect

c(2x4) correct incorrect

p(2x2) correct incorrect

(2, 1; 4, 3) correct incorrect

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. Which of these superstructures (for any given crystalline surface) could be represented as c(2×2) in Wood's notation?

(1, 1; $\overline{1}$, 1) correct incorrect

(2, 1; 1, 2) correct incorrect

(2, $\overline{1}$; $\overline{1}$, 1) correct incorrect

(2, 0; 0, 2) correct incorrect

(2, 0; 0, 1) correct incorrect

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. On the {111} surface of a face-centred cubic crystal, which of these superstructures has a rectangular primitive unit cell?

(4, 0; 1, 4) correct incorrect

(3, 1; 2, 3) correct incorrect

(4, 2; $\overline{2}$, 2) correct incorrect

(2, 1; 0, 2) correct incorrect

(3, 1; $\overline{2}$, 1) correct incorrect

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. What is the nature of the reciprocal lattice associated with a rhombic real-space lattice?

Triangular correct incorrect

Rhombic correct incorrect

Rectangular correct incorrect

Oblique correct incorrect

Square correct incorrect