Polarized Raman spectra of an oriented single crystal of barium nitrite monohydrate

1983 ◽  
Vol 61 (3) ◽  
pp. 608-612 ◽  
Author(s):  
O. P. Lamba ◽  
H. D. Bist ◽  
Y. S. Jain
Keyword(s):  
Single Crystal ◽  
Raman Spectra ◽  
Longitudinal Optical ◽  
Transverse Optical ◽  
Polarized Raman ◽  
First Time ◽  
Barium Nitrite ◽  
Lattice Modes ◽  
Oriented Single Crystal

The symmetries of the observed Raman lines in the 4000–30 cm−1 region in different orientations of a single crystal of Ba(NO2)2•H2O have been determined and the spectra have been analysed in terms of the phonons originating from the internal modes of the NO2− and H2O groups and the external lattice modes. The longitudinal-optical and transverse-optical (LO–TO) splittings arising from the Coulomb forces in the crystal arc reported for the first time.

scholarly journals THE POLARIZED RAMAN SPECTRA FOR SINGLE CRYSTAL LiB3O5

1996 ◽  
Vol 45 (5) ◽  
pp. 885
Author(s):  
JANG YI-JIAN ◽  
WANG YUE ◽  
ZENG LING-ZHI ◽  
LIU YU-LONG
Keyword(s):  
Single Crystal ◽  
Raman Spectra ◽  
Polarized Raman

Nondestructive Characterizations of Au-Catalyzed GaAs Nanowires on GaAs(111)B Substrates via Identifications of 1st Order Optical Phonon Modes Using μ-Raman Spectroscopy

2020 ◽  
Vol 20 (7) ◽  
pp. 4358-4363
Author(s):  
Jeung Hun Park ◽  
Richard S. Kim ◽  
Se-Jeong Park ◽  
Gye-Choon Park ◽  
Choong-Heui Chung
Keyword(s):  
Raman Spectroscopy ◽  
Dose Rate ◽  
Raman Spectra ◽  
Optical Phonon ◽  
Longitudinal Optical ◽  
Transverse Optical ◽  
Longitudinal Optical Phonon ◽  
Phonon Modes ◽  
Gaas Nanowires ◽  
Beam Dose

We report the relation between the catalyst patterning conditions and the intensity of the 1st order Raman active modes in Au-catalyzed GaAs nanowire bundles. We fabricated e-beam lithographically Au-patterned GaAs(111)B substrates by varying the patterning conditions (e-beam dose rate, dot-size and interdot-spacings), and grew GaAs nanowires via vapor–liquid–solid process using a solid-source molecular beam epitaxy. To understand the effects of the substrate preparation conditions and resulting morphologies on the optical characteristics of 1st order transverse optical and longitudinal optical phonon modes of GaAs, we characterized the nanowire bundles using complementary μ-Raman spectroscopy and scanning electron microscopy as a function of the e-beam dose rate (145–595 μC/cm2), inter-dot spacing (100 and 150 nm) and pattern size (100 and 150 nm). Ensembles of single crystalline GaAs nanowires covered with different Au-thickness exhibit a downshift and asymmetric broadening of the 1st order transverse optical and longitudinal optical phonon peaks relative to GaAs bulk modes. We also showed that the sensitivity of a downshift and broadening of Raman spectra are directly related to morphological and surface coverage variations in as-grown nanowires. We observed clear increases of the transverse optical and longitudinal optical intensity as well as the relatively higher peak shift and broadening of Raman spectra from the 100 nm patterning in response to the dose rate change. Strong dependence of Raman spectra of the nanowire bundles on the e-beam dose rate changes are attributed to the variations in spatial density, size, shape and random growth orientation of the wires. We have shown that the identification of the changes in GaAs longitudinal optical and Arsenic anti-site peaks is good indicators to characterize the quality of as-grown GaAs nanowires. Our finding confirms the utilization of Raman spectroscopy as a powerful tool for characterizing chemical, structural, and morphological information of as-grown nanowires within the supporting substrate.

Polarized Raman spectra of single-crystal n-C36H74

1976 ◽  
Vol 37 (3) ◽  
pp. 577-581 ◽  
Author(s):  
M. Kobayashi ◽  
T. Uesaka ◽  
H. Tadokoro
Keyword(s):  
Single Crystal ◽  
Raman Spectra ◽  
Polarized Raman

Polarized Raman spectra of single-crystal barium nitroprusside trihydrate, Ba[Fe(CN)5NO]·3H2O

1992 ◽  
Vol 23 (3) ◽  
pp. 131-136 ◽  
Author(s):  
J. A. Güida ◽  
O. E. Piro ◽  
P. J. Aymonino ◽  
O. Sala
Keyword(s):  
Single Crystal ◽  
Raman Spectra ◽  
Polarized Raman

The single crystal Raman spectrum of orthorhombic PbCl2

1970 ◽  
Vol 48 (18) ◽  
pp. 2931-2933 ◽  
Author(s):  
G. A. Ozin
Keyword(s):  
Raman Spectrum ◽  
Raman Scattering ◽  
Single Crystal ◽  
Lattice Vibrations ◽  
Polarized Raman ◽  
Oriented Single Crystal

The frequencies and symmetries of the even parity lattice vibrations of orthorhombic lead dichloride are determined by means of polarized Raman scattering from an oriented single crystal. The frequencies of the vibrations are interpreted in terms of symmetry co-ordinates and by comparison with the modes of the isomorphous lead dibromide.

scholarly journals Raman Spectra of 6LiRbSO4 and 7LiRbSO4

1993 ◽  
Vol 47 (7) ◽  
pp. 999-1006 ◽  
Author(s):  
Kyung Hui Oh ◽  
Joon Hyung Cho ◽  
Seung-Bin Kim
Keyword(s):  
Irreducible Representation ◽  
Single Crystal ◽  
Raman Spectra ◽  
Room Temperature ◽  
Lithium Ion ◽  
Lithium Isotope ◽  
Sulfate Ion ◽  
Vibrational Coupling ◽  
Coupling Interaction ◽  
Polarized Raman

The polarized Raman spectra of single-crystal 6LiRbSO4 and 7LiRbSO4 at room temperature are reported. On the basis of these data, symmetry-based band assignments are given for both internal and external optic modes. The translational optic modes of the lithium ion appear in the region between 444 and 364 cm−1. Vibrational coupling interactions are noted between the sulfate ion ν2 and the lithium translational optic modes in the same irreducible representation. Coupling interactions are negligible or small in 7LiRbSO4, while in 6LiRbSO4 the lithium isotope effect shifts the lithium translational modes into more coupling interaction with the sulfate ion ν2 modes.

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