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Return to Foundations of Surface Science 1e Student Resources
Chapter 3 Multiple Choice Questions
Quiz Content
*
not completed
.
At the surface of a free-electron metal having a valence electron density of 65 nm
-3
, the expected wavelength of Friedel oscillations perpendicular to the surface will be approximately…
0.20 nm
correct
incorrect
0.25 nm
correct
incorrect
0.30 nm
correct
incorrect
0.35 nm
correct
incorrect
0.40 nm
correct
incorrect
*
not completed
.
Within a free-electron model, the surface dipole is…
Independent of the Fermi wavenumber
correct
incorrect
Inversely proportional to the Fermi wavenumber
correct
incorrect
Inversely proportional to the square of the Fermi wavenumber
correct
incorrect
Proportional to the Fermi wavenumber
correct
incorrect
Proportional to the square of the Fermi wavenumber
correct
incorrect
*
not completed
.
The work functions of Cu{111} and Cu{110} are 4.94 eV and 4.48 eV respectively. By how much must their surface dipole densities differ?
Surface dipole density 1.22 D.nm
-2
higher for Cu{111} than for Cu{110}
correct
incorrect
Surface dipole density 0.61 D.nm
-2
higher for Cu{111} than for Cu{110}
correct
incorrect
Surface dipole densities are identical for both Cu{111} and Cu{110}
correct
incorrect
Surface dipole density 0.61 D.nm
-2
lower for Cu{111} than for Cu{110}
correct
incorrect
Surface dipole density 1.22 D.nm
-2
lower for Cu{111} than for Cu{110}
correct
incorrect
*
not completed
.
Two parallel metal plates face each other across a vacuum gap that is small relative to their lateral extent. The plates are linked by a conducting wire of comparatively negligible thickness, and the two facing surfaces have differing work functions. Ignoring edge effects and the regions within a few nanometres of the plates themselves, which of these statements ought to be true?
The electric field strength varies linearly across the vacuum gap
correct
incorrect
The electric field strength is least at the centre of the vacuum gap
correct
incorrect
The electric field strength is constant throughout the vacuum gap
correct
incorrect
The electric field strength is greatest at the centre of the vacuum gap
correct
incorrect
The electric field strength is zero throughout the vacuum gap
correct
incorrect
*
not completed
.
Isometric projection of the 1BZ of a bulk crystal onto a surface-parallel plane results in a shape having an area that is necessarily…
Equal to or smaller than that of the surface 1BZ
correct
incorrect
Equal to that of the surface 1BZ
correct
incorrect
Half that of the surface 1BZ
correct
incorrect
Twice that of the surface 1BZ
correct
incorrect
Equal to or larger than that of the surface 1BZ
correct
incorrect
*
not completed
.
Reconstruction of a crystalline surface results in a surface 1BZ that is necessarily…
Identical to or smaller than the ideal surface's 1BZ
correct
incorrect
Identical to that of the ideal surface's 1BZ
correct
incorrect
Twice the size of the ideal surface's 1BZ
correct
incorrect
Identical to or larger than the ideal surface's 1BZ
correct
incorrect
Half the size of the ideal surface's 1BZ
correct
incorrect
*
not completed
.
On the Au{111} surface, photoemission experiments indicate the maximum binding energy and effective mass for the Shockley state to be 380 meV and 0.211m
e
respectively (m
e
being the mass of a free electron). At what wavenumber does the corresponding band cross the Fermi level?
1.30 nm
-1
correct
incorrect
1.35 nm
-1
correct
incorrect
1.40 nm
-1
correct
incorrect
1.45 nm
-1
correct
incorrect
1.50 nm
-1
correct
incorrect
*
not completed
.
Upon saturation adsorption of Xe on Cu{111} at 40 K, the Shockley surface state of the metal is found to shift rigidly upward in energy, its zone-centre binding energy decreasing from 0.42 eV to 0.32 eV. By approximately what percentage of its clean-surface value must the Fermi wavenumber of this state have decreased?
10.0%
correct
incorrect
12.5%
correct
incorrect
15.0%
correct
incorrect
17.5%
correct
incorrect
20.0%
correct
incorrect
*
not completed
.
After saturation adsorption of Sb onto a Si{001} surface and subsequent annealing, the connectivity of atoms looks much the same as for the clean surface, except that the top-layer atoms forming the dimers are now Sb rather than Si. Which of these statements is most likely to be true?
The Sb dimers are tilted a little more than the Si dimers were
correct
incorrect
The Sb dimers are tilted about the same as the Si dimers were
correct
incorrect
The Sb dimers are hardly tilted at all
correct
incorrect
The Sb dimers are tilted a little less than the Si dimers were
correct
incorrect
The Sb dimers are tilted much more than the Si dimers were
correct
incorrect
*
not completed
.
In the extended Blyholder model, individual covalent interactions between a given adsorbate orbital and a specific surface orbital are…
Usually attractive, but sometimes repulsive
correct
incorrect
As often attractive as repulsive
correct
incorrect
Always repulsive, never attractive
correct
incorrect
Always attractive, never repulsive
correct
incorrect
Usually repulsive, but sometimes attractive
correct
incorrect
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