scholarly journals KINETICS OF LOW PRESSURE AMMONIA OXIDATION OVER RH(111)

2018 ◽  
Vol 48 (1) ◽  
pp. 27-30
Author(s):  
U. N. FAGIOLI ◽  
B. V. BOEHN ◽  
M. RAFTI ◽  
R. IMBIHL
Keyword(s):  
Single Crystal ◽  
Mass Spectroscopy ◽  
Pressure Range ◽  
Ammonia Oxidation ◽  
Low Pressure ◽  
Quadrupole Mass ◽  
Catalytic Surface ◽  
Sticking Coefficients ◽  
Kinetics Of

The kinetics of the NH3 + O2 reaction over a Rh(111) single crystal catalytic surface was explored in the 10-6 mbar pressure range at temperatures between 300-900 K. Selectivity towards N2 and NO products, and reactive sticking coefficients were monitored in situ using differentially pumped quadrupole mass spectroscopy (QMS).

scholarly journals Kinetics of the OH + NO<sub>2</sub> reaction: rate coefficients (217–333 K, 16–1200 mbar) and fall-off parameters for N<sub>2</sub> and O<sub>2</sub> bath gases

2019 ◽  
Vol 19 (16) ◽  
pp. 10643-10657 ◽  
Author(s):  
Damien Amedro ◽  
Arne J. C. Bunkan ◽  
Matias Berasategui ◽  
John N. Crowley
Keyword(s):  
Pressure Range ◽  
Great Influence ◽  
Rate Coefficients ◽  
Atmospheric Conditions ◽  
Collision Efficiency ◽  
Title Reaction ◽  
Temperature And Pressure ◽  
Kinetics Of ◽  
Lower Collision

Abstract. The radical terminating, termolecular reaction between OH and NO2 exerts great influence on the NOy∕NOx ratio and O3 formation in the atmosphere. Evaluation panels (IUPAC and NASA) recommend rate coefficients for this reaction that disagree by as much as a factor of 1.6 at low temperature and pressure. In this work, the title reaction was studied by pulsed laser photolysis and laser-induced fluorescence over the pressure range 16–1200 mbar and temperature range 217–333 K in N2 bath gas, with experiments at 295 K (67–333 mbar) for O2. In situ measurement of NO2 using two optical absorption set-ups enabled generation of highly precise, accurate rate coefficients in the fall-off pressure range, appropriate for atmospheric conditions. We found, in agreement with previous work, that O2 bath gas has a lower collision efficiency than N2 with a relative collision efficiency to N2 of 0.74. Using the Troe-type formulation for termolecular reactions we present a new set of parameters with k0(N2) = 2.6×10-30 cm6 molecule−2 s−1, k0(O2) = 2.0×10-30 cm6 molecule−2 s−1, m=3.6, k∞=6.3×10-11 cm3 molecule−1 s−1, and Fc=0.39 and compare our results to previous studies in N2 and O2 bath gases.

Raman and Secondary Ion Mass Spectroscopy of Epitaxial CdTe/InSb Interfaces Grown by Low-Energy Bias Sputtering

1990 ◽  
Vol 216 ◽  
Author(s):  
Suhit R. Das ◽  
David J. Lockwood ◽  
Stephen J. Rolfe ◽  
John P. McCaffrey ◽  
John G. Cook
Keyword(s):  
Raman Spectroscopy ◽  
Single Crystal ◽  
Mass Spectroscopy ◽  
Growth Kinetics ◽  
Film Deposition ◽  
Low Energy ◽  
Growth Surface ◽  
Secondary Ion Mass Spectroscopy ◽  
Secondary Ion

ABSTRACTHeteroepitaxial (100)CdTe || (100)InSb structures have been fabricated by growing CdTe epilayers, at growth temperatures below 200°C, on single crystal InSb substrates by low-energy bias sputtering. Controlled low-energy ion bombardment at the substrate was employed to clean the growth surface in-situ just prior to film deposition and to modify the growth kinetics and enhance adatom mobility during deposition. Raman spectroscopy of the interface revealed no evidence of In2Te3 and secondary ion mass spectroscopy showed the interface to be chemically abrupt.

Etching Kinetics of (100) Single Crystal Diamond Surfaces in a Hydrogen Microwave Plasma, Studied with In Situ Low-Coherence Interferometry

2017 ◽  
Vol 214 (11) ◽  
pp. 1700177 ◽  
Author(s):  
Vladimir Yurov ◽  
Egor Bushuev ◽  
Andrey Bolshakov ◽  
Evgeny Ashkinazi ◽  
Irina Antonova ◽  
...  
Keyword(s):  
Single Crystal ◽  
Microwave Plasma ◽  
Diamond Surfaces ◽  
Low Coherence ◽  
Low Coherence Interferometry ◽  
Single Crystal Diamond ◽  
Kinetics Of
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