Scanning Auger Microscopy and X Ray Photoemission Spectroscopy Studies of Metallic Archaeomaterials

1996 ◽  
Vol 462 ◽  
Author(s):  
E. Paparazzo ◽  
L. Moretto
Keyword(s):  
Spatial Resolution ◽  
Chemical Species ◽  
Lateral Distribution ◽  
Photoemission Spectroscopy ◽  
X Ray ◽  
Lead Pipe ◽  
Iron Sample ◽  
Spectroscopy Studies ◽  
Auger Microscopy ◽  
Lead Oxidation

ABSTRACTWe report on the surface microchemistry of a Roman iron object and of a Roman lead pipe ‘fistula’. The original patina of the iron sample consists mainly of oxidic phases whose lateral distribution is imaged with a submicron spatial resolution. Metallic iron in the bare surface is covered with a Fe(lll)-Fe(ll) oxidic layer which is several times thicker than in a modern ferritic steel. We find that the presence of a flux minimizes lead oxidation in the joint of the fistula as well as in comparison, ‘modern’ lead soldered samples. In one of these comparison samples the lateral distribution of the chemical species present is imaged with a spatial resolution of about 1000 Å.

Construction of the JAERI soft X-ray beamline for actinide material sciences

1998 ◽  
Vol 5 (3) ◽  
pp. 536-538 ◽  
Author(s):  
Takeshi Nakatani ◽  
Yuji Saitoh ◽  
Yuden Teraoka ◽  
Tetsuo Okane ◽  
Akinari Yokoya
Keyword(s):  
Photochemical Reactions ◽  
Resolving Power ◽  
Photoemission Spectroscopy ◽  
X Rays ◽  
Radioactive Materials ◽  
X Ray ◽  
Line Spacing ◽  
Material Sciences ◽  
Spectroscopy Studies ◽  
Under Construction

An undulator beamline for spectroscopy studies focusing on the electronic structure of actinide materials is under construction. Linearly or circularly polarized soft X-rays are provided by employing a variably polarizing undulator. Varied-line-spacing plane gratings and a sagittal-focusing system are used to monochromatize the undulator beam, whose energy ranges from 0.3 to 1.5 keV. A resolving power of 104 is expected in the whole energy region. These components are methodically operated by the SPring-8 beamline control system. There are three experimental stations in the beamline. In one of the stations the photoemission spectroscopy experiments are carried out at a radioisotope-controlled area where actinide compounds as well as unsealed radioactive materials are usable. Other experimental stations are planned in the beamline for surface photochemical reactions and biological applications.

X-ray photoemission spectroscopy studies of III–V compounds prepared by atomic layer epitaxy

Vacuum ◽  
1990 ◽  
Vol 41 (4-6) ◽  
pp. 1060
Author(s):  
K. Kodama ◽  
M. Ozeki ◽  
K. Mochizuki ◽  
Y. Sakuma ◽  
N. Ohtsuka
Keyword(s):  
Atomic Layer ◽  
Atomic Layer Epitaxy ◽  
Photoemission Spectroscopy ◽  
X Ray ◽  
Spectroscopy Studies

scholarly journals The Fermi Level as an Energy Reference in Liquid Jet X-ray Photoelectron Spectroscopy Studies of Aqueous Solutions  

2021 ◽  
Author(s):  
Lucia Pérez Ramírez ◽  
Anthony Boucly ◽  
Florent Saudrais ◽  
F. Bournel ◽  
Jean-Jacques Gallet ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Aqueous Solutions ◽  
Photoelectron Spectroscopy ◽  
Photoemission Spectroscopy ◽  
Liquid Jet ◽  
X Ray ◽  
Invaluable Tool ◽  
Structure Of Aqueous Solutions ◽  
Spectroscopy Studies ◽  
Photocatalytic Processes

To advance an understanding of key electrochemical and photocatalytic processes that depend on the electronic structure of aqueous solutions, X-ray photoemission spectroscopy has become an invaluable tool, especially when practiced...

scholarly journals Ultraviolet Irradiation on a Pyrite Surface Improves Triglycine Adsorption

Life ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 50 ◽  
Author(s):  
Santos Galvez-Martinez ◽  
Eva Mateo-Marti
Keyword(s):  
Functional Group ◽  
Chemical Species ◽  
Photoemission Spectroscopy ◽  
Molecular Adsorption ◽  
Surface Chemical ◽  
Pyrite Surface ◽  
Mineral Surface ◽  
Chemical Changes ◽  
X Ray ◽  
Highly Sensitive

We characterized the adsorption of triglycine molecules on a pyrite surface under several simulated environmental conditions by X-ray photoemission spectroscopy. The triglycine molecular adsorption on a pyrite surface under vacuum conditions (absence of oxygen) shows the presence of two different states for the amine functional group (NH2 and NH3+), therefore two chemical species (anionic and zwitterionic). On the other hand, molecular adsorption from a solution discriminates the NH2 as a unique molecular adsorption form, however, the amount adsorbed in this case is higher than under vacuum conditions. Furthermore, molecular adsorption on the mineral surface is even favored if the pyrite surface has been irradiated before the molecular adsorption occurs. Pyrite surface chemistry is highly sensitive to the chemical changes induced by UV irradiation, as XPS analysis shows the presence of Fe2O3 and Fe2SO4—like environments on the surface. Surface chemical changes induced by UV help to increase the probability of adsorption of molecular species and their subsequent concentration on the pyrite surface.

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