Large-amplitude dynamics in vinyl radical: The role of quantum tunneling as an isomerization mechanism

2012 ◽  
Vol 136 (3) ◽  
pp. 034305 ◽  
Author(s):  
Amit R. Sharma ◽  
Joel M. Bowman ◽  
David J. Nesbitt
Keyword(s):  
Quantum Tunneling ◽  
Large Amplitude ◽  
Vinyl Radical ◽  
Isomerization Mechanism

Geometric Factor in Skeletal Reactions of 2-Methylpentane on Stepped Surfaces of Platinum Catalyst

1992 ◽  
Vol 57 (10) ◽  
pp. 2012-2020
Author(s):  
Vladimír Hejtmánek
Keyword(s):  
Active Sites ◽  
Platinum Catalyst ◽  
Point Of View ◽  
Geometric Factor ◽  
Published Data ◽  
Stepped Surfaces ◽  
Geometric Conditions ◽  
Surface Intermediates ◽  
Isomerization Mechanism

The role of geometric factor in the course of skeletal reactions (isomerization, hydrogenolysis) of 2-methylpentane on stepped (119), (557) and reconstructed R(557) surfaces of single crystals of platinum was evaluated with computer designed models. These calculations were compared with reported experimental data. It was found by analysis of geometric conditions that there are accessible active ensembles on double step of the reconstructed R(557) surface. In addition, these active sites are unsaturated in their coordination sphere and thus catalytically effective. This finding is consistent with published data, confirming higher catalytic activity of this surface. The various pathways of Bond Shift isomerization mechanism of 2-methylpentane from the point of view of steric demands of surface intermediates on differently located ensembles are discussed, too.

Graphenylene and Inorganic Graphenylene Nanopores for Gas-Phase 4He/3He Separation: Kinetic and Steady-State Considerations

2021 ◽  
Author(s):  
Maryam Sadat Motallebipour ◽  
Javad Karimi-Sabet
Keyword(s):  
Steady State ◽  
Gas Phase ◽  
Quantum Tunneling ◽  
Zero Point ◽  
Selective Membrane ◽  
Quantum Phenomena ◽  
Mass Dependent

Selective membrane-based separation of light isotopes is considered to be possible based on the quantum phenomena. In this regard, the role of the two mass-dependent effects, quantum tunneling and zero-point...

scholarly journals The role of radiation pressure in LBV atmospheres

1989 ◽  
Vol 113 ◽  
pp. 195-204
Author(s):  
I. Appenzeller
Keyword(s):  
Mass Loss ◽  
Radiation Pressure ◽  
Large Amplitude ◽  
Pressure Effects ◽  
Radiative Acceleration

AbstractAs LBVs have luminosities close to their Eddington limits, their structure is profoundly influenced by radiation pressure. Radiation pressure effects probably cause the highly extended atmospheres and the extreme mass loss observed during the maximum states of the S Dor variables. An opacity-related instability of the radiative acceleration combined with a delayed thermal readjustement of the sub-atmospheric layers possibly explains the large-amplitude radius variations of these objects.

Role of mass renormalization in adiabatic quantum tunneling

1994 ◽  
Vol 49 (5) ◽  
pp. 2630-2636 ◽  
Author(s):  
N. Takigawa ◽  
K. Hagino ◽  
M. Abe ◽  
A. B. Balantekin
Keyword(s):  
Quantum Tunneling ◽  
Mass Renormalization
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