Vibrational dynamics and heat capacity of polyglycine I.
Earlier works on polyglycine I suffer from several infirmities, such as the dynamic methylene group being replaced by a mass unit and the use of poorly resolved inelastic neutron spectra, which have resulted in wrong assignments and imprecise profile of dispersion curves. In addition, the density-of-states and heat capacity variation as a function of temperature are being reported for the first time. The heat capacity is in good agreement with the measurements reported earlier by Roles and Wunderlich within a certain range (230-350 K). Deviations set in beyond this could be due to the presence of two crystalline states (I and II) in the sample used for the heat capacity measurements.
Physics Department, Lucknow University, Lucknow 226 007.
Vikas
V
Porwal
Radha Mohan
RM
Misra
Poonam
P
Tandon
Vishwambhar Dayal
VD
Gupta
D001703:Biophysics / Q000379:methods*; D004548:Elasticity; D006358:Hot Temperature; D009502:Neutrons; D010455:Peptides / Q000737:chemistry*; D060739:Phonons; D011108:Polymers / Q000737:chemistry; D011487:Protein Conformation; D019265:Spectroscopy, Near-Infrared / Q000379:methods; D013059:Spectrum Analysis, Raman / Q000379:methods; D013696:Temperature
D010455:Peptides; D011108:Polymers; C011080:polyglycine