Abstract
We present scanning tunneling microscopy (STM) images of meta-stable hydrogen adsorbate structures on the highly oriented pyrolytic graphite (HOPG) (0 0 0 1) surface and identify two unique and stable hydrogen structures. One of these is observed after thermal anneals to 525 K at both high and low hydrogen coverage and is identified as a hydrogen dimer structure. The other, a novel, more complex structure not previously observed, appears only after thermal anneals at high hydrogen coverage and is observed to exhibit long range orientation within each micro-crystallite region on the HOPG surface.
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