Force-constant model for the vibrational modes in black-phosphorene and phosphorene nanoribbons (PNRs)

2021 ◽  
pp. 114757
Author(s):  
Oussama Boutahir ◽  
Souhail Lakhlifi ◽  
Sidi Abdelmajid Ait Abdelkader ◽  
Mourad Boutahir ◽  
Abdelhai Rahmani ◽  
...  
Keyword(s):  
Force Constant ◽  
Vibrational Modes ◽  
Black Phosphorene

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.

Force-constant model for the vibrational modes inC70

1993 ◽  
Vol 48 (8) ◽  
pp. 5634-5642 ◽  
Author(s):  
R. A. Jishi ◽  
R. M. Mirie ◽  
M. S. Dresselhaus ◽  
G. Dresselhaus ◽  
P. C. Eklund
Keyword(s):  
Force Constant ◽  
Vibrational Modes

Force-constant model for the vibrational modes inC60

1992 ◽  
Vol 45 (23) ◽  
pp. 13685-13689 ◽  
Author(s):  
R. A. Jishi ◽  
R. M. Mirie ◽  
M. S. Dresselhaus
Keyword(s):  
Force Constant ◽  
Vibrational Modes

VIBRATIONAL EXCITATIONS IN GRADED ELASTIC CHAINS

2007 ◽  
Vol 21 (23n24) ◽  
pp. 4184-4189
Author(s):  
J. J. XIAO ◽  
K. YAKUBO ◽  
K. W. YU
Keyword(s):  
Force Constant ◽  
Elastic System ◽  
Normal Modes ◽  
Inhomogeneous System ◽  
Vibrational Modes ◽  
Disordered System ◽  
Graded Materials ◽  
One Dimensional ◽  
Vibrational Excitations ◽  
New Type

We study vibrational excitations in linearly graded materials and/or systems. Graded systems demonstrate a unique spectrum and mode profiles, resulting in a new type of localization-delocalization transition. The nature of gradients can confine certain vibrational excitations, and redistribute them spatially. These features are contrasted to the two extreme cases of inhomogeneous system, i.e., periodically modulated system and randomly disordered system, We show in detail vibrational normal modes sustained by one dimensional graded force constant and graded mass networks, in particular, a unusual kind of modes called gradons. We propose an approach to study vibrational modes in a grades elastic system with the help of a series of homogeneous systems. Using this approach, we elaborate the features of the elastic gradons and the phonon-gradon transition.

Anomalous vibrational modes in acetanilide as studied by inelastic neutron scattering

1992 ◽  
Vol 2 (10) ◽  
pp. 1929-1939 ◽  
Author(s):  
Mariette Barthes ◽  
Juegen Eckert ◽  
Susanna W. Johnson ◽  
Jacques Moret ◽  
Basil I. Swanson ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Vibrational Modes
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