Sentences with word «photoelectron»

Their method uses x-rays, in the form of x-ray photoelectron spectroscopy.

Using X-ray photoelectron spectroscopy and Fourier transform infrared imaging, the team found carbonyl groups at the tail ends of the polymer chains.

DeVine et al. used photoelectron spectroscopy to discern the quantum mechanical underpinnings of this 1,2 shift in a prototypical case: conversion of vinylidene (H2CC) to acetylene (HCCH).

These electrons, known as photoelectrons, have a very specific energy of 24.1 electronvolts, which means they can be traced by the CAPS instrument, and easily distinguished from other electrons, as they propagate through the surrounding magnetic field.»

Using photoelectron emission microscopy (PEEM) and X-ray magnetic circular dichroism (XMCD) at HZB, we are able to «see» and characterise the magnetic properties of individual chains,» explains Dr. Sergio Valencia, HZB.

After a battery sample is characterized in the large glove box, it is transferred without exposure to air to the X-ray photoelectron spectrometer for characterization of surface species.

This reaction was investigated with quantum state specificity by high - resolution photoelectron spectroscopy of the vinylidene anions H2CCˉ and D2CCˉ and quantum dynamics calculations.

Sample imaged using ARPES: Scientists at PGI - 3 used angle - resolved photoelectron spectroscopy (ARPES) to determine the degree of doping in the graphene samples.

Using a combination of spectro - photoelectron holography, electrical property measurements, and first - principles dynamics simulations, the 3D atomic structures of dopant impurities in a semiconductor crystal...

Ionospheric photoelectron peak features are also seen in Saturn's ring ionosphere (Coates et al. 2005) and in the neutral - rich inner magnetosphere of Saturn (Schippers et al. 2009) and they are predicted in Saturn's ionosphere (Galand et al. 2009).

The team found that these negatively - charged photoelectrons, spread throughout Titan's ionosphere and the tail, set up an electrical field.

We implemented self - referenced attosecond photoelectron interferometry to measure the temporal profile of the forward and backward electron wave packets emitted upon photoionization of camphor by circularly polarized laser pulses.

Using negative ion photoelectron spectroscopy and theoretical calculations, they created a probe to identify the exact structures involved in the GFP chromophore, showing that when the chromophore encounters water molecules, the first few molecules progressively stabilize the excited state of the chromophore.

He brings a variety of in situ and ex situ characterization methods to bear on the these materials, including high - resolution x-ray and ultraviolet photoelectron spectroscopy, x-ray diffraction, Rutherford backscattering, scanning transmission electron microscopy, electron energy loss spectroscopy, atom probe tomography and scanning probe microscopy.

The team used temperature - controlled photoelectron spectroscopy in EMSL, the DOE's Environmental Molecular Sciences Laboratory on the PNNL campus, to determine how tightly one cyanide ion and one to three water molecules interact at the very low temperature of -438 °F (12 Kelvin) and again at ambient temperature of 80 °F (equivalent to 300 Kelvin).

Acronyms: XRF = x-ray fluoresencence; RBS = Rutherford Backscattering; XRD = x-ray diffraction; SEM = scanning electron microscopy; AFM = atomic force microcopy; PES = photoelectron spectroscopy, with x-rays (XPS) and ultraviolet (UPS); KP = Kelvin probe measurements, SECM = scanning electrochemical microscopy, PL = photoluminescence; FTIR = Fourier transform infrared spectroscopy

As shown in Fig. 1b, the shoulder at lower binding energies becomes comparatively weaker at the larger θ = 40 ° photoelectron emission angle (with respect to the surface normal) when compared to spectra taken at θ = 20 °.

He has prepared and prosecuted patent applications for inventions in the electrical, medical, and mechanical arts, including laryngeal mask airway devices, pressure transducers, artifact reduction filters for CT scanners, parallel processors, magnetic bearings, optical gyroscopes, mass flowmeters, photoelectron multipliers, speech recognition systems and night vision systems.

Based on the experiences from high - tech industry of photoelectron semiconductor, CHOOSE NanoTech develops many consumer coatings to achieve the best protection with multi-functional properties for different applications.

The trapping is confirmed in situ by X-ray photoelectron spectroscopy at modest pressures of only 0.5 mbar (in the presence of X-rays) to trap the Ar atoms.

X-rays of a given energy are sent to the sample being studied, causing electrons in the inner shells of the sulphur atoms to be excited to higher energy or ejected as photoelectrons.

The project also used the expertise of staff and several advanced instruments — environmental transmission and scanning electron microscopes, an X-ray photoelectron spectrometer and a Mössbauer spectrometer — at EMSL, the Environmental Molecular Sciences Laboratory, a DOE Office of Science User Facility at PNNL.

It has a complete array of state - of - the - art laser instruments at its disposal, including a time - resolved photoelectron spectrometer that can generate ultra-short XUV pulses with duration below 45 femtoseconds.

Ionospheric photoelectrons can be used as an important diagnostic tool for the topology of the solar wind interaction with both magnetized and unmagnetized objects (Coates et al. 2011), possibly playing a role also in enhancing the ion escape.

The choice of tungsten diselenide as material turned out to be essential: It provides four photoelectron emission channels with different initial state properties and the outstanding stability of the surface enabled long - term data collecting improving the statistical significance.

At PNNL, researchers measured the electrochemical properties of each compound in the gas phase using photoelectron spectroscopy, located in EMSL.

But instead of a momentum distribution of N + ions, the scientists studied an interference pattern of photoelectrons that had tunneled from the outer shell of the atom.

Meanwhile, Franklin Tao, Luan Nguyen and Xiaoyan Zhang of the University of Kansas used ambient pressure X-ray photoelectron spectroscopy to characterize the oxidation state of cerium oxide, which was critical to deriving the mechanism.

In 23 fly - bys which passed through Titan's ionosphere or its magnetic tail, CAPS detected measurable quantities of these photoelectrons up to 6.8 Titan radii away from the moon, because they can easily travel along the magnetic field lines.

Support from DOE SC user facilities: computations were performed at National Energy Research Scientific Computing Center, Environmental Molecular Sciences Laboratory, and Argonne Leadership Computing Facility; microscopy studies used the Center for Nanoscale Materials, Molecular Foundry, and the Center for Nanophase Materials Sciences; and the x-ray photoelectron spectroscopy studies were carried out at Advanced Light Source.

Whereas most chiroptical effects result from a response of bound electrons, photoionization can produce much stronger chiral signals that manifest as asymmetries in the angular distribution of the photoelectrons along the light - propagation axis.

Peaks in the photoelectron spectra are considerably narrower than in previous work and reveal subtleties in the isomerization dynamics of neutral vinylidene, as well as vibronic coupling with an excited state of vinylidene.

This achievement, reported in a paper published today in Nature Communications, will enable scientists to use traditional surface - science tools — such as x-ray photoelectron and infrared reflection absorption spectroscopy — to perform detailed studies of single gas atoms in confinement.

In particular, photoelectron spectroscopy with extreme ultraviolet (XUV) radiation is a powerful method to probe the electron density in a valence shell of a molecular system.

When the interaction of metals was analyzed by X-ray photoelectron spectroscopy, it revealed the creation of a more supportive substrate for the forests to root in.

«We analyzed the structure of the buffer layer by X-ray photoelectron spectroscopy, transmission electron microscopy, and other techniques.

The kinetic energy of these photoelectrons and the angles at which they are ejected are then measured to obtain an electronic spectrum.

The researchers used high - resolution scanning electron microscopy with energy dispersive x-ray analysis to study microstructure and elemental composition, and high - resolution x-ray photoelectron spectroscopy for more detailed chemical characterization.

A first layer (V1) is found around the altitude of ~ 130 km and is caused by solar X-ray and impact ionization by photoelectrons.

The researchers first treated the STO layer to cap it with either a strontium oxide (SrO) plane or a titanium dioxide (TiO2) plane, which they confirmed using X-ray photoelectron spectroscopy.

Ionospheres are formed when external radiation, or energetic particles, ionize a neutral molecule, knocking off an orbital electron (which is then called a photoelectron or a secondary electron) and creating a positive ion.

Jinhui Yang performing X-ray photoelectron spectroscopy measurements, which are used to understand the chemical properties of surfaces, at the Joint Center for Artificial Photosynthesis.

One possible solution, which our team has recently demonstrated for III - V photoelectrodes, is to model speciation of interfacial reaction products by coupling ambient - pressure X-ray photoelectron spectroscopy (XPS) experiments to direct simulations of XPS based on model interfaces from ab initio molecular dynamics.