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  1. Home
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  4. The raman spectra of nanocomposite clusters of atoms in phosphorous-selenium glassy state
 
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The raman spectra of nanocomposite clusters of atoms in phosphorous-selenium glassy state

Journal
Advanced Materials Research
Date Issued
2013
Author(s)
Rosli A.N.
Kassim H.A.
Shrivastava K.N.
Radhika Devi V.
DOI
10.4028/www.scientific.net/AMR.667.99
Abstract
We make clusters of atoms of the size of less than 1 nanometer by using the density functional theory and from that we obtain the bond lengths corresponding to the minimum energy configuration. We are able to optimize large clusters of atoms and find the vibrational frequencies for each cluster. This calculation provides us with a method to identify the clusters present in an unknown sample of a glass by comparing the experimental Raman frequency with the calculated value. We start with the experimental values of the Raman frequencies of PSe (Phosphorous- Selenium) glass. We calculate the structural parameters of PSe, P4Se, P2Se2, P4Se5, PSe4, P4Se3 clusters of atoms and tabulate the vibrational frequencies. We compare the calculated values with those measured. In this way we find the clusters of atoms present in the glass. Sometimes, the same number of atoms can be rearranged in a different symmetry. Hence we learn the symmetries of molecules. We find that certain symmetries are broken due to self-organization in the glassy state. � (2013) Trans Tech Publications, Switzerland.
Subjects

Cluster

Density-functional th...

Glass

Raman spectra

Vibrational frequency...

Calculated values

Cluster

Experimental values

Large clusters

Minimum energy config...

Raman frequencies

Self organizations

Structural parameter

Atoms

Density functional th...

Nanoscience

Phosphorus

Raman scattering

Raman spectroscopy

Selenium

Vibrational spectra

Glass

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