A RAMAN SPECTROSCOPIC STUDY OF BARIUM COPPER OXIDE

Various physical treatments of BaCuO 2 samples result in irreversible changes in its Raman spectrum. The prominent peaks at 576 and 628 cm −1 in the spectra of sintered pellets of BaCuO 2 disappear upon further annealing in air or oxygen or upon mere regrinding of the pellets. Further annealing in air, oxygen, or vacuum does not restore these peaks. Similar but less intense peaks reappear upon exposure of pellets to laboratory environment for several weeks, but these broaden and disappear upon further exposure. These spectral characteristics contrast with those observed in Y123 Raman spectrum. It is concluded that the peaks at 582 cm −1 and 636 cm −1 in the spectra of sintered pellets of Y123 are not due to the presence of BaCuO 2.

Download Full-text

Raman Spectroscopic Study Of Ion-Implanted And Annealed Silicon.

MRS Proceedings ◽

10.1557/proc-406-549 ◽

1995 ◽

Vol 406 ◽

Author(s):

David. D. Tuschel ◽

James P. Lavine ◽

Jeffrey B. Russell

Keyword(s):

Raman Spectroscopy ◽

Raman Spectrum ◽

Spectroscopic Study ◽

Complete Recovery ◽

Acoustic Mode ◽

Raman Intensity ◽

Optical Mode ◽

Raman Spectroscopic ◽

Raman Spectroscopic Study ◽

Transverse Acoustic

AbstractRaman spectroscopy is used to characterize silicon implanted with arsenic and then annealed. The implant dose ranged from 2 × 1012 to 2 × 1013/cm2. The as-implanted samples show a decreased Raman intensity of the 520 cm−1 optical mode, and increased Raman intensity between 400 and 500 cm−1 with respect to an unimplanted silicon wafer. The higher arsenic doses show an increase in the second-order transverse acoustic-mode (TA) intensity around 300 cm−1 relative to the secondorder transverse optical-mode (TO) intensity near 970 cm−1. Annealing restores the 2TA/2TO relative intensities and sharpens the weak peaks between 600 and 900 cm−1. The Raman spectrum is altered by the lowest dose implant and the annealing steps do not lead to a complete recovery of the pre-implant Raman spectrum. This permits the monitoring of lowdose ion-implant damage recovery with Raman spectroscopy.

Download Full-text

Raman Spectroscopic Study of Coal Samples during Heating

Applied Sciences ◽

10.3390/app9214699 ◽

2019 ◽

Vol 9 (21) ◽

pp. 4699 ◽

Cited By ~ 3

Author(s):

Yingfang Xie ◽

Jinglin You ◽

Liming Lu ◽

Min Wang ◽

Jian Wang

Keyword(s):

High Temperature ◽

Spectroscopic Study ◽

Spectral Characteristics ◽

Blue Shift ◽

Carbonaceous Materials ◽

Temperature Dependent ◽

Spectral Parameters ◽

Raman Spectroscopic ◽

Raman Spectroscopic Study ◽

Raman Spectral

Raman spectroscopy can be used to record the characteristic spectra of carbonaceous materials. The D and G bands are the most popular and most important spectral characteristics when discussing carbonaceous materials. In this paper, a Raman spectroscopic study of different coals was first carried out using a 355 nm wavelength laser beam as an excitation source. The spectral parameters of the resultant spectra were evaluated and analyzed. Raman spectral characteristics of different kinds of coals were explored. The high temperature-dependent Raman spectra of the coals were further collected in a temperature range from 298 to 1473 K in order to investigate the transformations of the internal structure of the coals during the pyrolysis process. An abnormal blue shift of the G band occurred at moderate temperature (600–900 K), and the intensity of the G band became weaker at high temperatures, indicating pyrolysis and graphitization of the sample at moderate and high temperature, respectively.

Download Full-text

Faculty Opinions recommendation of Oxygen-sensing mechanism of HemAT from Bacillus subtilis: a resonance Raman spectroscopic study.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.1024257.287827 ◽

2005 ◽

Author(s):

Bruce Averill

Keyword(s):

Bacillus Subtilis ◽

Spectroscopic Study ◽

Oxygen Sensing ◽

Resonance Raman ◽

Raman Spectroscopic ◽

Sensing Mechanism ◽

Raman Spectroscopic Study

Download Full-text

Raman spectroscopic study of artificially twisted and non-twisted trilayer graphene

Applied Physics Letters ◽

10.1063/5.0040716 ◽

2021 ◽

Vol 118 (13) ◽

pp. 133101

Author(s):

Sanghyun Kim ◽

Donghyeon Lee ◽

Binbin Wang ◽

Shang-Jie Yu ◽

Kenji Watanabe ◽

...

Keyword(s):

Spectroscopic Study ◽

Raman Spectroscopic ◽

Raman Spectroscopic Study ◽

Trilayer Graphene

Download Full-text

Hydrogen Bonds: Raman Spectroscopic Study

International Journal of Molecular Sciences ◽

10.3390/ijms22105380 ◽

2021 ◽

Vol 22 (10) ◽

pp. 5380

Author(s):

Boris A. Kolesov

Keyword(s):

Hydrogen Bonding ◽

Hydrogen Bonds ◽

Spectroscopic Study ◽

Raman Spectra ◽

Temperature Region ◽

Vibrational Frequency ◽

Chemical Compounds ◽

Raman Spectroscopic ◽

Raman Spectroscopic Study ◽

Proton Dynamics

The work outlines general ideas on how the frequency and the intensity of proton vibrations of X–H×××Y hydrogen bonding are formed as the bond evolves from weak to maximally strong bonding. For this purpose, the Raman spectra of different chemical compounds with moderate, strong, and extremely strong hydrogen bonds were obtained in the temperature region of 5 K–300 K. The dependence of the proton vibrational frequency is schematically presented as a function of the rigidity of O-H×××O bonding. The problems of proton dynamics on tautomeric O–H···O bonds are considered. A brief description of the N–H···O and C–H···Y hydrogen bonds is given.

Download Full-text