Search results for "high resolution"

A high pressure gas target system for the determination of absolute electron scattering cross sections

1979

A high pressure gas target system is described, which is suitable for measurements of absolute electron scattering cross sections and for high resolution electron scattering experiments at medium energies. Details of design and construction are given and special investigations are discussed with respect to straggling effects that take place in the walls and in the gases, and to changes in the gas density, due to heating by the electron beam.

High-Resolution Spectroscopy and Analysis of the nu(4) Bending Region of SF(6) near 615 cm(-1).

2001

The high-resolution Fourier transform spectrum of the nu(4) bending region of SF(6) near 615 cm(-1) has been recorded at 213 K. We were able to perform a simultaneous analysis of the nu(4) and nu(4) + nu(6) - nu(6) bands of the main isotopomer, namely (32)SF(6). This is the first detailed analysis of a hot band for this molecule. The nu(4) band of (34)SF(6) was also analyzed and the Q branch of the nu(4) band of (33)SF(6) was identified. In both cases we used the HTDS software developed in Dijon. Copyright 2001 Academic Press.

First High-Resolution Raman Spectrum and Analysis of the ν5 Bending Fundamental of SF6

2002

Abstract The high-resolution Raman spectrum of the Q , R , and S branches of the ν 5 bending fundamental of SF 6 has been recorded at a temperature of 195 K (dry ice) and a pressure of 39 mbar. This is the first study ever performed of a ν 5 band of an XY 6 molecule. It has been analyzed thanks to the HTDS software ( http://www.u-bourgogne.fr/LPUB/shTDS.html ) developed in Dijon. This contribution should be of help in understanding the role hot bands in the strong absorbing ν 3 region.

High-Resolution Spectroscopy and Analysis of the ν3 and ν4 Fundamentals of Monoisotopic 70GeF4

2001

The first high-resolution study on germanium tetrafluoride is reported. We used a monoisotopic sample of (70)GeF(4). The FTIR spectra of the two infrared active fundamentals, namely the nu(4) (bending) and nu(3) (stretching) modes, were recorded at a temperature of ca. 210 K and a resolution (1/maximum optical path difference) of 0.0031 and 0.0023 cm(-1), respectively. These spectra were analyzed using the STDS software developed in Dijon. In both cases, we obtained a fit with a root mean square better than 1x10(-3) cm(-1). Both bands show very regular structures with no detectable perturbation. Copyright 2001 Academic Press.

High-resolution deep view microscopy of cells and tissues

2020

Abstract Methods, experimental setups and perspectives of three-dimensional deep view imaging microscopy of cell or tissue samples are reported. Preliminary biophysical and clinically relevant examples are presented.

Growth, structural and optical properties of GaN/AlN and GaN/GaInN nanowire heterostructures

2012

Abstract After discussing the GaN NW nucleation issue, we will present the structural properties of axial and radial (i.e. core/shell) GaN/AlN NW heterostructures and adress the issue of critical thickness during the growth of such heterostructures. Next, we will present the growth of InGaN NWs on a GaN NW base. It will be shown that the morphology and structural properties of the InGaN NW sections depend on the In content: for high In content a flat top is observed and plastic relaxation is occuring, with mismatch dislocations formed at the InGaN/GaN interface. By contrast, for In content below 25% InGaN NWs exhibit a pencil-like shape assigned to a purely elastic strain relaxation process…

The fingerprint of Te-rich and stoichiometric Bi2Te3 nanowires by Raman spectroscopy

2016

We unambiguously show that the signature of Te-rich bismuth telluride is the appearance of three new peaks in the Raman spectra of Bi2Te3, located at 88, 117 and 137 cm−1 . For this purpose, we have grown stoichiometric Bi2Te3 nanowires as well as Te-rich nanowires. The absence of these peaks in stoichiometric nanowires, even in those with the smallest diameter, shows that they are not related to confinement effects or the lack of inversion symmetry, as stated in the literature, but to the existence of Te clusters. These Te clusters have been found in nonstoichiometric samples by high resolution electron microscopy, while they are absent in stoichiometric samples. The Raman spectra of the l…

High-resolution investigation of nanoparticle interaction with a model pulmonary surfactant monolayer.

2012

The pulmonary surfactant film spanning the inner alveolar surface prevents alveolar collapse during the end-exhalation and reduces the work of breathing. Nanoparticles (NPs) present in the atmosphere or nanocarriers targeted through the pulmonary route for medical purposes challenge this biological barrier. During interaction with or passage of NPs through the alveolar surfactant, the biophysical functioning of the film may be altered. However, experimental evidence showing detailed biophysical interaction of NPs with the pulmonary surfactant film are scant. In this study, we have investigated the impact of a hydrophobic polyorganosiloxane (AmOrSil20) NPs on the integrity as well as on the …

Ultrahigh-Resolution Microwave Spectroscopy on TrappedYb+171Ions

1982

Characterization of a pulsed injection-locked Ti:sapphire laser and its application to high resolution resonance ionization spectroscopy of copper

2017

A high repetition rate pulsed Ti:sapphire laser injection-locked to a continuous wave seed source is presented. A spectral linewidth of 20 MHz at an average output power of 4W is demonstrated. An enhanced tuning range from 710-920 nm with a single broadband mirror set is realized by the inclusion of a single thin birefringent quartz plate for suppression of unseeded emission. The spectral properties have been analyzed using both a scanning Fabry-P´erot interferometer as well as crossed beam resonance ionization spectroscopy of the hyperfine levels of natural copper. Delayed ionization of the long-lived excited state is demonstrated for increased resolution. For the excited state hyperfine c…