1Deptt. of Chemistry, Samta College, Jandaha, Vatshah, Bihar, India.
2Deptt. of Chemistry, J.P. University, Chapra, Bihar, India.
3Deptt. of Physics, H.N.K. Inter College, Ara, Bihar, India.
4Deptt. of Chemistry, A.B.S. College, Lalganj, Bihar, India.
Online published on 11 January, 2013.
We have studied the stabilities and path ways between different fragments resulting from the adsorption and break down of Ammonia on Silicon. We have made careful comparison of these features and their appearance in scanning tunnellnq microscopy and observed that NH2-H. dimers are the dominant features resulting from room temperature adsorption. NH, 2H configurations are more stable like pH3 case. The effects of adsorbate -adsorbate interactions have also been studied. We proposed that a weak preference for forming the zig-zag configurations as a result of dynamic dimer buckling is counteracted by Physisorbed H-bonded intermediate at 300k. AI tow coverages the ammonia fragments are observed to form clumps, which extended both along and cross dimer rows, suggesting interactions between molecules.
Dimer, Proximity, Ammonia, Silicon Scanning, Tunneling
