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Vibrational dynamics and heat capacity in polyglycine II

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Title Vibrational dynamics and heat capacity in polyglycine II
 
Creator Mishra, Abhishek Kumar
Singh, Mahendra
Tandon, Poonam
Gupta, Vishwambhar Dayal
 
Subject Polyglycine II
Density-of-states
Phonon dispersion
Heat capacity
Urey-Bradley force field
 
Description 240-246
The earlier works on the vibrational dynamics of polyglycine II (PG II) suffer from several infirmities, which not only suppress the dynamical nature of normal modes, but also lead to several incorrect assignments and interactive constants of the potential field. In this study, we have re-examined the phonon dispersion profiles of PG II using Higgs method for evaluation of phase-related normal modes and have attempted to remove the infirmities, as far as possible. The Wilson’s GF matrix method combined with the Urey-Bradley force field has been used for normal mode analysis. This potential field leads to correct assignments of Raman, infrared and inelastic neutron scattering frequencies. Characteristic features of the dispersion curve (ν versus δ/π plot), such as repulsion and regions of high density-of-states have been interpreted. In addition, the heat capacity as a function of temperature has been obtained via density-of-states. It agrees well with the experimental data and is being reported for the first time.
 
Date 2008-02-21T09:57:38Z
2008-02-21T09:57:38Z
2007-08
 
Type Article
 
Identifier 0301-1208
http://hdl.handle.net/123456789/121
 
Language en_US
 
Publisher CSIR
 
Source IJBB Vol.44(4) [August 2007]