Desorption Energy of Oxygen Molecule from Anionic Gold Oxide Clusters, AunO2–, Using Thermal Desorption Spectrometry

2016 ◽  
Vol 120 (40) ◽  
pp. 23069-23073 ◽  
Author(s):  
Masato Yamaguchi ◽  
Ken Miyajima ◽  
Fumitaka Mafuné
Keyword(s):  
Thermal Desorption ◽  
Oxygen Molecule ◽  
Desorption Energy ◽  
Gold Oxide ◽  
Thermal Desorption Spectrometry

scholarly journals Thermal desorption of formamide and methylamine from graphite and amorphous water ice surfaces

2019 ◽  
Vol 15 (S350) ◽  
pp. 370-371
Author(s):  
Henda Chaabouni ◽  
Stephan Diana ◽  
Thanh Nguyen
Keyword(s):  
Energy Distribution ◽  
Thermal Desorption ◽  
Interstellar Dust ◽  
Binding Energies ◽  
Desorption Energy ◽  
Exponential Factor ◽  
Water Ice ◽  
Ice Surface ◽  
Crystalline Water ◽  
Best Fit

AbstractThermal desorption experiments of Formamide (NH2CHO) and methylamine (CH3NH2) were performed in LERMA-Cergy laboratory to determine the values of the desorption energies of formamide and methylamine from analogues of interstellar dust grain surfaces, and to understand their interaction with water ice. We found that more than 95 % of solid NH2CHO diffuses through the np-ASW ice surface towards the graphitic substrate, and is released into the gas phase with a desorption energy distribution Edes = (7460 – 9380) K, measured with the best-fit pre-exponential factor A=1018 s-1. Whereas, the desorption energy distribution of methylamine from the np-ASW ice surface (Edes =3850-8420 K) is measured with the best-fit pre-exponential factor A=1012s-1. A fraction of solid methylamine, of about 0.15 monolayer diffuses through the water ice surface towards the HOPG substrate, and desorbs later, with higher binding energies (5050-8420 K), which exceed that of the crystalline water ice (Edes =4930 K), calculated with the same pre-exponential factor A=1012 s-1.

Origin of the Hydrogen Absorbed by Incoherent TiC Particles in Iron

2005 ◽  
Vol 475-479 ◽  
pp. 233-236 ◽  
Author(s):  
Kaneaki Tsuzaki ◽  
Fu Gao Wei
Keyword(s):  
Heat Treatment ◽  
Water Vapor ◽  
High Temperatures ◽  
Thermal Desorption ◽  
Hydrogen Absorption ◽  
Room Temperature ◽  
Trap Hydrogen ◽  
Thermal Desorption Spectrometry ◽  
Long Time

Hydrogen absorption of incoherent TiC particles that were once reported to be strong hydrogen traps in iron at room temperature was investigated by means of thermal desorption spectrometry (TDS). The results indicated that incoherent TiC particles in iron do not trap hydrogen at all at room temperature even they are cathodically charged for a long time. Only at high temperatures and in atmosphere containing hydrogen source, incoherent TiC particles can trap hydrogen. The origin of hydrogen trapped by incoherent TiC particles was justified to be water vapor in the atmosphere during heat treatment.

Stability of Nitrogen in Sputtered Iron Nitride thin films and Multilayers

1997 ◽  
Vol 475 ◽  
Author(s):  
H. Chatbi ◽  
M. Vergnat ◽  
J. F. Bobo ◽  
L. Hennet
Keyword(s):  
Thin Films ◽  
Thermal Desorption ◽  
Rf Sputtering ◽  
Iron Nitride ◽  
X Ray Diffraction ◽  
X Ray ◽  
Thermal Desorption Spectrometry

ABSTRACTDifferent phases of FeN thin films and Fe/FeN multilayers were prepared by reactive rf sputtering. The release of nitrogen and the crystallographic transformations during annealing were monitored by thermal desorption spectrometry and X-ray diffraction experiments. Finally, the diffusivity of nitrogen in the γ-Fe4N phase was evaluated.

A New Method to Determine the Activation Energy for Hydrogen Desorption from Steels

2005 ◽  
Vol 475-479 ◽  
pp. 229-232
Author(s):  
Fu Gao Wei ◽  
Kaneaki Tsuzaki ◽  
Toru Hara
Keyword(s):  
Activation Energy ◽  
Thermal Desorption ◽  
Precise Measurement ◽  
Hydrogen Desorption ◽  
New Method ◽  
Thermal Desorption Spectrum ◽  
Thermal Desorption Spectrometry ◽  
Desorption Spectrum ◽  
Tic Particle ◽  
Best Fit

A new method has been developed to determine the activation energy for hydrogen desorption from steels by means of thermal desorption spectrometry (TDS). This method directly fits the Kissinger’s reaction kinetic formula dX/dt=A(1-X)exp(-Ed/RT) to experimentally measured thermal desorption spectrum and best fit yields the activation energy (Ed) and the value of constant A. It has been proven that this new method is applicable to precise measurement of the activation energy for hydrogen desorption from incoherent TiC particle, coherent TiC precipitate, grain boundary and dislocation in 0.05C-0.20Ti-2.0Ni and 0.42C-0.30Ti steels.

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