Sezawa and love modes in Co/Cu superlattices

Open Physics ◽  
2003 ◽  
Vol 1 (4) ◽  
Author(s):  
Tomasz Błachowicz
Keyword(s):  
Light Scattering ◽  
Boundary Conditions ◽  
Theoretical Approach ◽  
Theoretical Study ◽  
Experimental Results ◽  
Brillouin Light Scattering ◽  
Acoustic Modes ◽  
Scattering Measurements

AbstractIn this paper detailed theoretical study and experimental results concerning acoustic surface and undersurface propagation modes in multilayered Co/Cu superlattices are provided. The theoretical approach was adopted from that of Adler and Farnel. Experimental results were obtained in Brillouin light-scattering measurements. The Sezawa and Love acoustic modes were observed as a result of boundary conditions at the interface between hexagonal and cubic structures.

scholarly journals Inversion of light-scattering measurements for particle size and optical constants: theoretical study

1994 ◽  
Vol 33 (18) ◽  
pp. 4025 ◽  
Author(s):  
Matthew R. Jones ◽  
Bill P. Curry ◽  
M. Quinn Brewster ◽  
Keng H. Leong
Keyword(s):  
Particle Size ◽  
Light Scattering ◽  
Optical Constants ◽  
Theoretical Study ◽  
Scattering Measurements

scholarly journals Brillouin Light Scattering Study of Microscopic Structure and Dynamics in Pyrrolidinium Based Ionic Liquids

2020 ◽  
Author(s):  
Supti Das ◽  
Dhanya Radhakrishnan ◽  
Venkata. S. Bhadram ◽  
Chandrabhas Narayana ◽  
Aninda J. Bhattacharyya
Keyword(s):  
Ionic Liquids ◽  
Phase Transitions ◽  
Light Scattering ◽  
Solid Phase ◽  
Microscopic Structure ◽  
Temperature Dependent ◽  
Brillouin Light Scattering ◽  
Acoustic Modes ◽  
Structure And Dynamics ◽  
Acoustic Velocities

<p>Pyrrolidinium based ionic liquids are known to be good ionic conductors even in solid-state around room temperature, which is attributed to the highly disordered plastic crystalline phase. Moreover, these ionic liquids are characterized by multiple phase transitions which include plastic, structural glass, and glassy crystal phases with varying levels of molecular disorder. Temperature-dependent Brillouin light scattering is used to investigate the phase transitions in a series of alkylmethylpyrrolidinium Bis(trifluoromethanesulfonyl) imides (P<i><sub>1n</sub></i>TFSI, n=1,2,4). Brillouin spectral features such as the number of acoustic modes, their shape, and linewidth provide the picture of different disordered phases resultant of dynamics at the microscopic scale. The longitudinal and transverse acoustic velocities in different phases are determined from the corresponding acoustic mode frequencies (Brillouin shift). Extremely low acoustic velocities in the solid phase of P<i><sub>11</sub></i>TFSI and P<i><sub>12</sub></i>TFSI are a consequence of a high degree of disorder and plasticity present in the system. Anomalous temperature-dependent behavior of linewidth and asymmetric (Fano) line shape of acoustic modes observed in certain phases of P<i><sub>1n</sub></i>TFSI could be due to the strong coupling between the Brillouin central peak and the acoustic phonons. The present results establish that the Brillouin light scattering technique can be efficiently used to understand the complex phase behavior, microscopic structure, and dynamics of ionic liquids.</p>

scholarly journals Brillouin Light Scattering Study of Microscopic Structure and Dynamics in Pyrrolidinium Based Ionic Liquids

2020 ◽  
Author(s):  
Supti Das ◽  
Dhanya Radhakrishnan ◽  
Venkata. S. Bhadram ◽  
Chandrabhas Narayana ◽  
Aninda J. Bhattacharyya
Keyword(s):  
Ionic Liquids ◽  
Phase Transitions ◽  
Light Scattering ◽  
Solid Phase ◽  
Microscopic Structure ◽  
Temperature Dependent ◽  
Brillouin Light Scattering ◽  
Acoustic Modes ◽  
Structure And Dynamics ◽  
Acoustic Velocities

<p>Pyrrolidinium based ionic liquids are known to be good ionic conductors even in solid-state around room temperature, which is attributed to the highly disordered plastic crystalline phase. Moreover, these ionic liquids are characterized by multiple phase transitions which include plastic, structural glass, and glassy crystal phases with varying levels of molecular disorder. Temperature-dependent Brillouin light scattering is used to investigate the phase transitions in a series of alkylmethylpyrrolidinium Bis(trifluoromethanesulfonyl) imides (P<i><sub>1n</sub></i>TFSI, n=1,2,4). Brillouin spectral features such as the number of acoustic modes, their shape, and linewidth provide the picture of different disordered phases resultant of dynamics at the microscopic scale. The longitudinal and transverse acoustic velocities in different phases are determined from the corresponding acoustic mode frequencies (Brillouin shift). Extremely low acoustic velocities in the solid phase of P<i><sub>11</sub></i>TFSI and P<i><sub>12</sub></i>TFSI are a consequence of a high degree of disorder and plasticity present in the system. Anomalous temperature-dependent behavior of linewidth and asymmetric (Fano) line shape of acoustic modes observed in certain phases of P<i><sub>1n</sub></i>TFSI could be due to the strong coupling between the Brillouin central peak and the acoustic phonons. The present results establish that the Brillouin light scattering technique can be efficiently used to understand the complex phase behavior, microscopic structure, and dynamics of ionic liquids.</p>

Molecular aggregations in water–2-butoxyethanol mixtures by ultrasonic and Brillouin light-scattering measurements

1991 ◽  
Vol 44 (4) ◽  
pp. 2578-2587 ◽  
Author(s):  
G. D’Arrigo ◽  
F. Mallamace ◽  
N. Micali ◽  
A. Paparelli ◽  
C. Vasi
Keyword(s):  
Light Scattering ◽  
Brillouin Light Scattering ◽  
Scattering Measurements

Scattering Rings in Birefringent Porous Silicon

2003 ◽  
Vol 762 ◽  
Author(s):  
Claudio J. Oton ◽  
Zeno Gaburro ◽  
Mher Ghulinyan ◽  
Nicola Daldosso ◽  
Lucio Pancheri ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Light Scattering ◽  
Porous Silicon ◽  
Direct Measurement ◽  
Optical Anisotropy ◽  
Oblique Incidence ◽  
Laser Light ◽  
Anisotropic Scattering ◽  
Scattering Measurements

AbstractWe report the observation of strongly anisotropic scattering of laser light at oblique incidence on (100)-oriented porous silicon layers. We performed angle-resolved light scattering measurements and three concentric rings were observed. Modeling porous silicon by means of nanometric columnar air pores and an effective anisotropic uniaxial dielectric constant explains the observed phenomenon, and besides, the observation of the angle aperture of these rings allows a direct measurement of relative birefringence. We finally study the changes of optical anisotropy after different modifications of the structure.

Light Scattering from Deformed Droplets and Droplets with Inclusions: Volume 1 - Experimental Results

2000 ◽  
Author(s):  
David R. Secker ◽  
Richard Greenaway ◽  
Paul H. Kaye ◽  
Edwin Hirst ◽  
David Bartley
Keyword(s):  
Light Scattering ◽  
Experimental Results
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