نتایج جستجو برای: infrared spectrum

تعداد نتایج: 320726  

2014
Manuel Dujovny Onyekachi Ibe Pablo Sosa

Near infrared is a subdivision in the infrared spectrum between the range of 800 nanometers and 2,500 nanometers wavelength. There are no exact numbers on these wavelengths. Near Infrared is found on the right outermost of the visible light band of the electromagnetic spectrum. Visible Light near infrared emits irradiation in the spectrum of the human eye and its electromagnetic spectrum is in ...

Journal: :Physical review letters 2013
Y Kim J M Poumirol A Lombardo N G Kalugin T Georgiou Y J Kim K S Novoselov A C Ferrari J Kono O Kashuba V I Fal'ko D Smirnov

We perform polarization-resolved Raman spectroscopy on graphene in magnetic fields up to 45 T. This reveals a filling-factor-dependent, multicomponent anticrossing structure of the Raman G peak, resulting from magnetophonon resonances between magnetoexcitons and E(2g) phonons. This is explained with a model of Raman scattering taking into account the effects of spatially inhomogeneous carrier d...

Journal: :Physical chemistry chemical physics : PCCP 2012
Piter S Miedema Peter Ngene Ad M J van der Eerden Tsu-Chien Weng Dennis Nordlund Dimosthenis Sokaras Roberto Alonso-Mori Amélie Juhin Petra E de Jongh Frank M F de Groot

X-Ray Raman Spectroscopy (XRS) is used to study the electronic properties of bulk lithium borohydride (LiBH(4)) and LiBH(4) in porous carbon nano-composites (LiBH(4)/C) during dehydrogenation. The lithium (Li), boron (B) and carbon (C) K-edges are studied and compared with calculations of the starting material and intermediate compounds. Comparison of the B and C K-edge XRS spectra of the as-pr...

Journal: :Physical chemistry chemical physics : PCCP 2015
Carlos Randino Ricard Gelabert Miquel Moreno José M Lluch Kiryl D Piatkevich

Classical molecular dynamics (MD) simulations are carried out for the recently developed TagRFP675 fluorescent protein (FP), which is specifically designed to fully absorb and emit in the near infrared (NIR) region of the electromagnetic spectrum. Since the X-ray data of TagRFP675 reveal that the chromophore exists in both the cis and trans configuration and it can also be neutral (protonated) ...

2008
Albert A. Zijlstra

We present a radiative-transfer calculation which reproduces the infrared spectrum of the planetary nebula BD+303639, fitting both the spectral energy distribution and the spatial extent at infrared wavelengths. We obtain an acceptable fit to most of the spectrum, including the infrared bands. The fit requires a distance of ≥ 2 kpc, which implies that BD+303639 has evolved from a massive progen...

Journal: :Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy 2011
Jiangtao Peng Silong Peng An Jiang Jie Tan

A calibration transfer method for near-infrared (NIR) spectra based on spectral regression is proposed. Spectral regression method can reveal low dimensional manifold structure in high dimensional spectroscopic data and is suitable to transfer the NIR spectra of different instruments. A comparative study of the proposed method and piecewise direct standardization (PDS) for standardization on tw...

Journal: :Journal of combinatorial chemistry 2005
A Venimadhav K A Yates M G Blamire

Composition-spread La(1-x)SrxMnO3 thin films were prepared by pulsed laser deposition technique from LaMnO3 and SrMnO3 targets. The films were epitaxial with a continuous variation of the out-of-plane lattice parameter along the direction of composition gradient. Scanning Raman spectroscopy has been employed as a nondestructive tool to characterize the composition-spread films. Raman spectra sh...

2016
Pengfei Pan Houguang Sun Hankang Zhang Yachun Mao Hui Luan

In recent years, the research of modeling method based on near infrared spectrum data has become one of the main methods for the analysis of mineral composition, however, due to the influence of various factors, there is a lot of noise in the near infrared spectrum data, which causes serious influence on the precision of the model and model robustness. In this paper, the method of using wavelet...

1998
Luis Colina Ralph C. Bohlin Fiorella Castelli

An absolute ux calibrated reference spectrum of the Sun covering the 0.12 to 2.5 m wavelength range is presented. The ultraviolet and optical spectrum is based on absolute ux measurements from satellites and from the ground. The near-infrared spectrum is based on measurements using the NASA CV-990 aircraft and on a model spectrum. The synthetic optical and near-infrared magnitudes of the absolu...

خانلری, محمدرضا, ریحانی, علی, واحدی, وحید,

In this research, ZnO nanostructure hexagonal pyramid rods with high optical and structural quality were synthesized by the simple thermal chemical vapor deposition of Zn powder without a metal catalyst. Surface morphologies were characterized by scanning electron microscopy (SEM). XRD analyses demonstrated that ZnO hexagonal pyramid rods had a wurtzite structure with the orientation of (002). ...

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