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In a space between the two Twin Tower footprints at bedrock, visitors see a wall behind which the Office of Chief Medical Examiner of the City of New York operates and maintains a repository for the unidentified remains and a smallwork space.

A repository for the remains of 9/11 victims under the jurisdiction of the Office of Chief Medical Examiner of the City of New York (OCME) is located at bedrock at the World Trade Center site. The repository is an official New York City facility operated by the OCME, and is designed to meet the OCME’s professional specifications for access, security and environmental controls. The repository provides a dignified and reverential setting for the remains to repose – temporarily or in perpetuity – as identifications continue to be made. The OCME is committed to the ongoing work to identify the remains of 9/11 victims, but no DNA testing will be performed on site at the repository.

The repository is separate from the public space of the 9/11 Memorial Museum, and is only accessible by OCME staff. A private space exclusively for 9/11 family members, known as the Reflection Room, is located next to the repository. No portion of these spaces is accessible to the general public. There is no cost for 9/11 family members to visit the repository or the 9/11 Memorial Museum.

Additional information about the repository from the OCME can be found .

For 9/11 Family Members wishing to visit the Reflection Room: A Message from the New York City Office of Chief Medical Examiner

In order to ensure that you will have adequate private time in the Reflection Room at the repository, we urge you to schedule in advance by calling the Office of Chief Medical Examiner's WTC Hot Line number 212-447-7884. If you have any questions for the Office of Chief Medical Examiner WTC Team, please call the hot line or visit online at nyc.gov/ocme .

A dedicated section for the loved ones of those killed in the 2001 and 1993 attacks. Stay informed and plan your visit.

More Information»

The National September 11 Memorial Museum is only possible because of your support.

All donations are tax deductible »

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This may be contrasted with the following picture which shows a schematic of a reconstructed surface - this particular example is similar to the "missing row model" proposed for the structure of a number of reconstructed (110) fcc metal surfaces.

Since reconstruction involves a change in the periodicity of the surface and in some cases also a change in surface symmetry, it is readily detected using surface diffraction techniques (e.g. LEED RHEED ).

The overall driving force for reconstruction is once again the minimization of the surface free energy - at the atomic level, however, it is not always clear why the reconstruction should reduce the surface free energy. For some metallic surfaces, it may be that the change in periodicity of the surface induces a splitting in surface-localized bands of energy levels and that this can lead to a lowering of the total electronic energy when the band is initially only partly full.

In the case of many semiconductors, the simple reconstructions can often be explained in terms of a "surface healing" process in which the co-ordinative unsaturation of the surface atoms is reduced by bond formation between adjacent atoms. For example, the formation of a Si(100) surface requires that the bonds between the Si atoms that form the new surface layer and those that were in the layer immediately above in the solid are broken - this leaves two "dangling bonds" per surface Si atom.

A relatively small co-ordinated movement of the atoms in the topmost layer can reduce this unsatisfied co-ordination - pairs of Si atoms come together to form surface "Si dimers", leaving only one dangling bond per Si atom. This process leads to a change in the surface periodicity : the period of the surface structure is doubled in one direction giving rise to the so-called (2x1) reconstruction observed on all clean Si(100) surfaces [ nike air jordan 11 retro low bgl
].

In this section, attention has been concentrated on the reconstruction of clean surfaces. It is, however, worth noting that reconstruction of the substrate surface is frequently induced by the adsorption of molecular or atomic species onto the surface - this phenomenon is known as adsorbate-induced reconstruction (see nike roshe flyknit grey womens adidas
for some examples).

Summary

The minimisation of surface energy means that even single crystal surfaces will not exhibit the ideal geometry of atoms to be expected by truncating the bulk structure of the solid parallel to a particular plane. The differences between the real structure of the clean surface and the ideal structure may be imperceptibly small (e.g. a very slight surface relaxation ) or much more marked and involving a change in the surface periodicity in one or more of the main symmetry directions ( surface reconstruction ).

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