A Low Frequency Study of the Vibrational Modes in Alkalisilicate Glasses by Raman Spectroscopy

1995 ◽  
Vol 407 ◽  
Author(s):  
R. Sommer ◽  
J. Toulouse ◽  
H. Jain
Keyword(s):  
Raman Spectroscopy ◽  
Force Constant ◽  
Density Of States ◽  
System Analysis ◽  
Low Frequency ◽  
Boson Peak ◽  
Single Parameter ◽  
Silicate Glasses ◽  
Vibrational Modes ◽  
Peak Region

ABSTRACTWe have performed a study on low frequency modes in several alkali silicate glasses by Raman spectroscopy. The Boson peak region is analyzed with a single parameter ω0 which is believed to characerize the density of states of the system. Analysis of the dependence of ω0 on the nature and concentration of the alkali suggests that the position of the Boson peak is essentially governed by the ratio “force constant” over “mass” of localized oscillator modes. At lower frequency (below 30 cm−1), the “excess” intensity can be explained by considering secondorder processes of the same vibrational modes, superimposed on other (possibly relaxational) modes.

scholarly journals Raman spectroscopy studies of the terahertz vibrational modes of a DUT-8 (Ni) metal–organic framework

2017 ◽  
Vol 19 (47) ◽  
pp. 32099-32104 ◽  
Author(s):  
Alexander Krylov ◽  
Alexander Vtyurin ◽  
Petko Petkov ◽  
Irena Senkovska ◽  
Mariia Maliuta ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Metal Organic Framework ◽  
Low Frequency ◽  
Molecular Dynamic Simulations ◽  
Vibrational Modes ◽  
Dynamic Simulations ◽  
Metal Organic ◽  
Flexible Metal ◽  
Spectroscopy Studies ◽  
Organic Framework

Raman spectroscopy and Molecular Dynamic simulations were applied to study low-frequency vibrations of a flexible metal–organic framework DUT-8(Ni).

Low frequency vibrational density of state of highly permeable super glassy polynorbornenes – the Boson peak

2020 ◽  
Vol 22 (33) ◽  
pp. 18381-18387
Author(s):  
Reiner Zorn ◽  
Paulina Szymoniak ◽  
Mohamed A. Kolmangadi ◽  
Marcell Wolf ◽  
Dmitry A. Alentiev ◽  
...  
Keyword(s):  
Density Of States ◽  
Time Of Flight ◽  
Low Frequency ◽  
Boson Peak ◽  
Density Of State ◽  
Neutron Time ◽  
Incoherent Neutron ◽  
Vibrational Density

Inelastic incoherent neutron time-of-flight scattering was employed to measure the low frequency density of states for a series of addition polynorbornenes with bulky side groups.

Collective vibrational modes in molecular assembly of DNA and its application to biological systems. Low frequency Raman spectroscopy

1985 ◽  
Vol 82 (1) ◽  
pp. 531-535 ◽  
Author(s):  
Hisako Urabe ◽  
Hideyuki Hayashi ◽  
Yasunori Tominaga ◽  
Yoshifumi Nishimura ◽  
Kenji Kubota ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Biological Systems ◽  
Low Frequency ◽  
Molecular Assembly ◽  
Vibrational Modes ◽  
Collective Vibrational Modes

scholarly journals Boson-peak-like anomaly caused by transverse phonon softening in strain glass

2020 ◽  
Author(s):  
Shuai Ren ◽  
Hongxiang Zong ◽  
Xuefei Tao ◽  
Yonghao Sun ◽  
Bao An Sun ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Glassy State ◽  
Low Frequency ◽  
Boson Peak ◽  
Vibrational Properties ◽  
Vibrational Modes ◽  
Simulation Studies ◽  
Dynamic Relaxation ◽  
Phonon Softening ◽  
Transverse Acoustic

Abstract Strain glass is considered as a new glassy state with frozen ferroelastic/martensitic nanodomains in shape memory alloys, which exhibits many novel functionalities, yet its nature remains unclear. In this study, we reported a new dynamic relaxation behavior in strain glass that was thought to be only present in structural glasses. An abnormal hump was observed in strain glass around 10 K upon normalizing the specific heat (Cp) by cubed temperature, quite similar to the boson peak in metallic glass. The simulation studies showed that this boson-peak-like anomaly in Cp corresponds to excess low-frequency vibrational modes that stem from the transverse acoustic (TA) phonon softening of the non-transforming regions surrounding the nanodomains. The phonon softening takes place in the TA branches not associated with the martensitic transformation displacements. This work may provide a useful perspective for understanding the nature of glassy states and associated vibrational properties.

scholarly journals Anomalies in the low frequency vibrational density of states for a polymer with intrinsic microporosity – the Boson peak of PIM-1

2018 ◽  
Vol 20 (3) ◽  
pp. 1355-1363 ◽  
Author(s):  
Reiner Zorn ◽  
Huajie Yin ◽  
Wiebke Lohstroh ◽  
Wayne Harrison ◽  
Peter M. Budd ◽  
...  
Keyword(s):  
Density Of States ◽  
Low Frequency ◽  
Boson Peak ◽  
Vibrational Density Of States ◽  
First Time ◽  
Intrinsic Microporosity ◽  
Vibrational Density

For the first time the low frequency vibrational density of states is reported for a polymer with intrinsic microporosity.

scholarly journals Low frequency vibrational modes of oxygenated myoglobin, hemoglobins, and modified derivatives.

1994 ◽  
Vol 269 (49) ◽  
pp. 31047-31050
Author(s):  
S Jeyarajah ◽  
L M Proniewicz ◽  
H Bronder ◽  
J R Kincaid
Keyword(s):  
Low Frequency ◽  
Vibrational Modes
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