Quantum state and surface-site-resolved studies of methane chemisorption by vibrational spectroscopies

2020 ◽  
Vol 22 (31) ◽  
pp. 17448-17459
Author(s):  
Ana Gutiérrez-González ◽  
Rainer D. Beck
Keyword(s):  
Quantum State ◽  
Spectroscopic Methods ◽  
Surface Site ◽  
Platinum Surfaces ◽  
Infrared Spectroscopic ◽  
Vibrational Spectroscopies ◽  
Site Selective ◽  
Methane Chemisorption

Infrared spectroscopic methods enable quantum-state-specific and surface-site-selective studies of methane chemisorption on stepped platinum surfaces.

scholarly journals Comparison of two modern infrared spectroscopic methods for the determination of orientation in drawn bulk polymers

2000 ◽  
Vol 19 (2) ◽  
pp. 205-212 ◽  
Author(s):  
Pavel Schmidt ◽  
Miroslav Raab ◽  
Jan Kolařı́k ◽  
Klaus J Eichhorn
Keyword(s):  
Spectroscopic Methods ◽  
Infrared Spectroscopic ◽  
Bulk Polymers

Structure and Content of Dicyclopentadiene in Ethylene Propylene Dicyclopentadiene Terpolymers

1967 ◽  
Vol 40 (2) ◽  
pp. 563-568
Author(s):  
R. J. de Kock ◽  
A. Veermans
Keyword(s):  
Double Bond ◽  
Polymer Chain ◽  
Spectroscopic Methods ◽  
Double Bonds ◽  
Model Compounds ◽  
Ethylene Propylene ◽  
Infrared Spectroscopic ◽  
Polymerization Mixture ◽  
Derivatives Of

Abstract With the aid of model compounds—derivatives of endo- and exo-dicyclopentadiene—it has been established that a) the 9, 10-double bond (the double bond in the norbornane ring) is involved in the polymerization of dicyclopentadiene with ethylene and propylene, b) dicyclopentadiene, present in the polymerization mixture in the endo-configuration, occurs in the exo-configuration in the polymer chain. The same model compounds enable the dicyclopentadiene content of ethylene propylene dicyclopentadiene terpolymers to be determined by infrared spectroscopic methods. Use is made of the 3045 cm−1 band, which is characteristic of endo-cyclic double bonds in five-membered rings.

Structure and Photoluminescent Properties of Microstructural YBO3 : Eu3+ Nanocrystals

2007 ◽  
Vol 7 (2) ◽  
pp. 593-601 ◽  
Author(s):  
Guohui Pan ◽  
Hongwei Song ◽  
Lixin Yu ◽  
Zhongxin Liu ◽  
Xue Bai ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Luminescent Properties ◽  
Radiative Transition ◽  
Surface Site ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
Hydrothermal Temperature ◽  
Transmission Electron ◽  
Site Selective ◽  
Radiative Transition Rate

YBO3 : Eu3+ nanocrystals (NCs) were prepared by a hydrothermal method and characterized by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier-transform infrared (FTIR) spectroscopy. The results demonstrate that morphology and structure of the NCs varied strongly with hydrothermal temperature. Their luminescent properties were investigated in comparison to the bulk. A large number of NO&minus3 groups were adsorbed at the surface of hydrothermal products, which acted as luminescent killers; Two symmetry sites of Eu3+ ions in NCs, the interior and the surface sites, were identified by the site-selective excitation and time-resolved emission experiments; The intensity ratio of 5D0–7F2 to 5D0–7F1 of Eu3+ at the surface site increased greatly than that at the interior site; as a result, the chromaticity was improved; The total radiative transition rate of 5D0–ΣJ7Fj for Eu3+ at the surface site was 3–5 times larger than that at the interior.

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