A5006503593- Spectroscopy and Laser Applications
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Molecular Spectroscopy and Structure
- Advanced Chemical Physics Studies
- Diamond and Carbon-based Materials Research
- Semiconductor materials and devices
- Laser Design and Applications
- Spectroscopy and Quantum Chemical Studies
- Atomic and Subatomic Physics Research
- Advancements in Semiconductor Devices and Circuit Design
- Metal and Thin Film Mechanics
- Calibration and Measurement Techniques
- Scientific Measurement and Uncertainty Evaluation
- Electron and X-Ray Spectroscopy Techniques
- Analytical Chemistry and Chromatography
- Quantum and electron transport phenomena
- Inorganic Fluorides and Related Compounds
- Silicon Nanostructures and Photoluminescence
- Ion-surface interactions and analysis
- Chemical Thermodynamics and Molecular Structure
- Atmospheric chemistry and aerosols
- Electron Spin Resonance Studies
- Graphene research and applications
- Phase Equilibria and Thermodynamics
Sorbonne Université
2002-2024
Centre National de la Recherche Scientifique
2009-2024
Laboratoire des Sciences des Procédés et des Matériaux
2013-2024
Université Sorbonne Paris Nord
2012-2024
Université Paris Cité
1986-2018
Sorbonne Paris Cité
2015-2018
CEA DAM Île-de-France
2010-2012
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2010-2012
Université Paris-Sud
1996-2011
Université de Technologie de Compiègne
2011
This letter shows that a moderate degree of edge disorder can explain the fact experimentally measured bandgaps graphene nanoribbons (GNRs) do not depend on orientation. We argue GNRs actually behave similarly to Anderson insulators and should thus be interpreted as quasi-mobility edges. Calculations in tight binding approach reveal presence disorder, electronic structures become independent orientation follows quasi-universal law similar experimental data, although with different parameters.
Abstract
Line mixing effects have been observed in absorption spectra recorded, at room temperature, with a Fourier spectrometer. They concern the Q branches of ν1+ν2 band N2O, centered 1880.2 cm−1 and (1110)I←(0220) CO2, 740.8 cm−1. For N2O spectra, gas was pure its pressure has raised up to more than 6 atm. The CO2 were registered total below 1 atm either or mixed argon nitrogen. Comparison is made between experimental results computations taking into account off-diagonal elements relaxation matrix.
New "MuElec" models and processes are developed implemented in Geant4 for the generation of low energy electrons silicon by incident electrons, protons heavy ions. They allow a more accurate modeling proton ion tracks; differences clearly seen as compared to tracks previously obtained with already available ionization models, mainly located first 10 nm track core. The effect these new on response electronic devices is studied means TCAD simulations. Significant collected charge-up 25%-are...
Line-mixing effects have been studied in the ν3 band of CH4 perturbed by N2 at room temperature. New measurements made and a model is proposed which not, for first time, strictly empirical. Three different experimental set ups used order to measure absorption 2800–3200 cm−1 spectral region total pressures 0.25–2 25–80 atm ranges. Analysis spectra demonstrates significant influence line mixing on shape Q branch P R manifolds. A based state-to-state collisional transfer rates calculated from...
We present theoretical calculations of phonon dispersion in silicon nanocrystals using an approach based on the adiabatic bond charge model. To deal with boundary conditions, two cases are considered: surface atoms either free to move or rigidly fixed. In former case, modes appear at low frequencies and, latter nodes and antinodes near a frequency 11 THz. By projecting nanocrystal basis bulk modes, one can show increasing correlation between when dot size. Finally, shift Raman spectra...
The phonon dispersion and the vibrational density of states (VDOS) graphene nanoribbons (GNR) various widths edge shapes are calculated using force constant model including fifth-nearest neighbor atoms. Among typical peaks like E2g (or G) D peaks, several distinctive ribbon identified in VDOS depending on shape. According to our calculation, nature a GNR can be by characteristic VDOS: many out-of-plane localized modes detected at about 630 cm−1 armchair GNRs in-plane 480 zigzag GNRs. In...
A Fourier-transform absorption spectrum of the three silicium isotopes silane in natural abundance have been recorded from 840 to 1040 cm −1 . The line width is 3 × 10 −3 and absolute accuracy estimated be about 2 −4 for non-saturated non-overlapped lines. analysis this achieved, using a Hamiltonian, formulated with an irreducible tensorial set Td group.For dyad ν 4 each isotopic species, 30 reduced effective Hamiltonian parameters are determined, giving wave numbers 2.5 28 SiH , 3.4 29 5.5...
Very high resolution Fourier transform spectra of HNO3 recorded in the 1230–1370 cm-1 spectral region have been extensively analysed leading to precise line positions and intensities for v 3 4 bands this molecule. Then, using a hamiltonian which takes explicitly into account Fermi Coriolis resonances between these two bands, it has possible reproduce satisfactorily majority interacting rotational levels. Moreover due unobserved vibrorotational levels are discussed. Intensities 218 individual...
We have recorded a vibration–rotation spectrum of 28 SiH 4 from 840 to 1040 cm −1 with Fourier transform spectrometer operating an apparatus-function width 2 × 10 −3 . An analysis microwave transitions and 919 combination differences between two different ground state levels excited level belonging the band ν or been used determine value constants as expressed in sixth-order Hamiltonian development. The experimental needed was Laboratoire de Spectronomie Moléculaire Paris. precision is about...
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