Figure 1.

Basics of the GaAs(001)-4 × 6 surface. (a) A LEED pattern using an electron energy of 51 eV, (b) atomic structure proposed by Ohtake et al. (adapted from [17]. copyright 2004 American Physical Society), and (c) As 3d and Ga 3d core-level photoemission spectra with various emission angles (θe).

Pi et al. Nanoscale Research Letters 2013 8:169   doi:10.1186/1556-276X-8-169
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