scholarly journals Determination of light elements using the RBS method

2020 ◽  
Vol 6 ◽  
pp. 263
Author(s):  
M. Kokkoris ◽  
Ch. Zarkadas ◽  
S. Harissopulos ◽  
E. Kossionides ◽  
T. Paradellis
Keyword(s):  
Classical Method ◽  
Rutherford Backscattering ◽  
Rutherford Backscattering Spectroscopy ◽  
Spectroscopy Method ◽  
Light Elements ◽  
The Future ◽  
First Results

The RBS (Rutherford Backscattering Spectroscopy) method is a classical method which has been successfully used for the study and analysis of surface elements. The strong points as well as the weaknesses of the technique are briefly outlined and emphasis is given in the determination of light elements. A method is proposed in order to overcome the problem and the first results and prospects for the future are analysed.

scholarly journals Application of Nuclear Techniques to the Investigation of the Oxidation Behavior of Ion-Implanted Steels

2019 ◽  
Vol 7 ◽  
pp. 222
Author(s):  
F. Noli ◽  
P. Misaelides
Keyword(s):  
Nuclear Reaction ◽  
Oxidation Behavior ◽  
Depth Distribution ◽  
Rutherford Backscattering ◽  
Rutherford Backscattering Spectroscopy ◽  
Aluminum Concentration ◽  
Near Surface ◽  
Depth Profiles ◽  
Ion Implanted

The oxidation behavior of ion-implanted steel samples in air, using Nuclear Reaction Analysis (NRA) and Rutherford Backscattering Spectroscopy (RBS) techniques. Austenitic stainless steel AISI 321 (Fe/Crl8/Ni8/Mn2/Ti) samples implanted with magnesium-, aluminum- and zirconium-ions (implantation energy 40 keV, dose: 1-1017 to 2-1017 ions/cm2) were oxidized in air in the temperature region 450-650 °C for several periods of time. The above implants were selected on the basis of the affinity to oxygen, as well as their ability to form protective oxides as MgO, AI2O3, Zr02 in order to improve the oxidation resistance of steel. The determination of the oxygen concentration and depth-profiles was performed by means of the 160(d, p)170 nuclear reaction. Rutherford Backscattering Spectroscopy was applied to investigate the near-surface layers and to determine the depth profiles of the implanted ions. The determination of the aluminum concentration and the depth distribution of the Al-ions was performed using the resonance at 992 keV of the 27Al(p, 7)28Si nuclear reaction whereas the concentration and the depth distribution of the Mg-ions by the means of the 24Mg(o;, p)27Al reaction. The excitation function of the 24Mg(a:, p)27Al nuclear reaction was studied in the energy region 4600-5000 keV and absolute cross section data allowing the determination of the Mg-profile were determined for this purpose.

scholarly journals Depth Profiles of Nitrogen and Chlorine in Pure Materials Through AMS of the Neutron Activation Products 14C and 36Cl

Radiocarbon ◽  
1989 ◽  
Vol 31 (03) ◽  
pp. 292-297 ◽  
Author(s):  
David Elmore ◽  
T Z Hossain ◽  
H E Gove ◽  
T K Hemmick ◽  
P W Kubik ◽  
...  
Keyword(s):  
Neutron Activation ◽  
Light Elements ◽  
New Approach ◽  
Depth Profiles ◽  
Low Concentrations ◽  
Activation Products ◽  
First Results ◽  
Residual Gas ◽  
Materials Used

Determination of the more common light elements such as nitrogen and chlorine at trace levels is difficult because of their high abundance on sample surfaces, in materials used to build analysis instruments, and in the residual gas of the instrument vacuum. We present here a new approach to analysis of these elements: accelerator mass spectrometry (AMS) combined with neutron activation. The problem of contamination is overcome by using neutron activation to produce long-lived radioisotopes which generally have low concentrations in the environment. For measurement of 14N and 35Cl, AMS can provide sensitive background-free measurements of their neutron activation products 14C and 36Cl and, in addition, can provide depth profiles. These are the first results of this new method: depth profiles of nitrogen and chlorine implanted in semiconductor grade silicon.

International determination of the total motion of the pole

1961 ◽  
Vol 13 ◽  
pp. 29-41
Author(s):  
Wm. Markowitz
Keyword(s):  
Secular Motion ◽  
The Future

A symposium on the future of the International Latitude Service (I. L. S.) is to be held in Helsinki in July 1960. My report for the symposium consists of two parts. Part I, denoded (Mk I) was published [1] earlier in 1960 under the title “Latitude and Longitude, and the Secular Motion of the Pole”. Part II is the present paper, denoded (Mk II).

Stoichiometric Determination of Graphite Intercalation Compounds Using Rutherford Backscatiering Spectrometry

1983 ◽  
Vol 27 ◽  
Author(s):  
L. Salamanca-Riba ◽  
B.S. Elman ◽  
M.S. Dresselhaus ◽  
T. Venkatesan
Keyword(s):  
Experimental Error ◽  
Rutherford Backscattering Spectrometry ◽  
Rutherford Backscattering ◽  
Intercalation Compounds ◽  
Graphite Intercalation Compounds ◽  
X Ray ◽  
Donor And Acceptor ◽  
Graphite Intercalation ◽  
Non Destructive

ABSTRACTRutherford backscattering spectrometry (RBS) is used to characterize the stoichiometry of graphite intercalation compounds (GIC). Specific application is made to several stages of different donor and acceptor compounds and to commensurate and incommensurate intercalants. A deviation from the theoretical stoichiometry is measured for most of the compounds using this non-destructive method. Within experimental error, the RBS results agree with those obtained from analysis of the (00ℓ) x-ray diffractograms and weight uptake measurements on the same samples.

Determination of the Recent Tectonic Movements Using GPS and Insar Methods; The First Results From the Eastern Part of the Gediz Graben

2015 ◽  
Author(s):  
Fatih POYRAZ ◽  
Orhan TATAR ◽  
Kemal Özgür HASTAOĞLU ◽  
İbrahim TİRYAKİOĞLU ◽  
Önder GÜRSOY ◽  
...  
Keyword(s):  
First Results ◽  
Tectonic Movements

scholarly journals Observing UT1-UTC with VGOS

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Rüdiger Haas ◽  
Eskil Varenius ◽  
Saho Matsumoto ◽  
Matthias Schartner
Keyword(s):  
Standard Deviation ◽  
Reference Frame ◽  
Earth Rotation ◽  
Space Observatory ◽  
International Earth Rotation ◽  
Onsala Space Observatory ◽  
X Band ◽  
First Results

AbstractWe present first results for the determination of UT1-UTC using the VLBI Global Observing System (VGOS). During December 2019 through February 2020, a series of 1 h long observing sessions were performed using the VGOS stations at Ishioka in Japan and the Onsala twin telescopes in Sweden. These VGOS-B sessions were observed simultaneously to standard legacy S/X-band Intensive sessions. The VGOS-B data were correlated, post-correlation processed, and analysed at the Onsala Space Observatory. The derived UT1-UTC results were compared to corresponding results from standard legacy S/X-band Intensive sessions (INT1/INT2), as well as to the final values of the International Earth Rotation and Reference Frame Service (IERS), provided in IERS Bulletin B. The VGOS-B series achieves 3–4 times lower formal uncertainties for the UT1-UTC results than standard legacy S/X-band INT series. The RMS agreement w.r.t. to IERS Bulletin B is slightly better for the VGOS-B results than for the simultaneously observed legacy S/X-band INT1 results, and the VGOS-B results have a small bias only with the smallest remaining standard deviation.

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