scholarly journals Reduced-Dimensionality Quantum Dynamics Study of the 3Fe(CO)4 + H2 → 1FeH2(CO)4 Spin-inversion Reaction

Molecules ◽  
2020 ◽  
Vol 25 (4) ◽  
pp. 882 ◽  
Author(s):  
Toshiyuki Takayanagi ◽  
Yuya Watabe ◽  
Takaaki Miyazaki
Keyword(s):  
Potential Energy ◽  
Potential Energy Surfaces ◽  
Quantum Dynamics ◽  
Reaction Probability ◽  
Spin Orbit ◽  
Inversion Point ◽  
Nonadiabatic Transition ◽  
Metal Compounds ◽  
Energy Surfaces ◽  
Spin Inversion

Many chemical reactions of transition metal compounds involve a change in spin state via spin inversion, which is induced by relativistic spin-orbit coupling. In this work, we theoretically study the efficiency of a typical spin-inversion reaction, 3Fe(CO)4 + H2 → 1FeH2(CO)4. Structural and vibrational information on the spin-inversion point, obtained through the spin-coupled Hamiltonian approach, is used to construct three degree-of-freedom potential energy surfaces and to obtain singlet-triplet spin-orbit couplings. Using the developed spin-diabatic potential energy surfaces in reduced dimensions, we perform quantum nonadiabatic transition state wave packet calculations to obtain the cumulative reaction probability. The calculated cumulative reaction probability is found to be significantly larger than that estimated from the one-dimensional surface-hopping probability. This indicates the importance of both multidimensional and nuclear quantum effects in spin inversion for polyatomic chemical reaction systems.

Activation of C2H6by Gas-Phase Ta+: Potential Energy Surfaces, Spin−Orbit Coupling, Spin-Inversion Probabilities, and Reaction Mechanisms

2009 ◽  
Vol 28 (21) ◽  
pp. 6160-6170 ◽  
Author(s):  
Ling-Ling Lv ◽  
Yong-Cheng Wang ◽  
Zhi-Yuan Geng ◽  
Yu-Bing Si ◽  
Qiang Wang ◽  
...  
Keyword(s):  
Potential Energy ◽  
Gas Phase ◽  
Reaction Mechanisms ◽  
Potential Energy Surfaces ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Energy Surfaces ◽  
Spin Inversion

Exact state-to-state quantum dynamics of the F+HD→HF(v′=2)+D reaction on model potential energy surfaces

2008 ◽  
Vol 129 (6) ◽  
pp. 064303 ◽  
Author(s):  
Dario De Fazio ◽  
Vincenzo Aquilanti ◽  
Simonetta Cavalli ◽  
Antonio Aguilar ◽  
Josep M. Lucas
Keyword(s):  
Potential Energy ◽  
Potential Energy Surfaces ◽  
Quantum Dynamics ◽  
Model Potential ◽  
Energy Surfaces

CHEMICAL REACTIONS IN THE O(1D) + HCl SYSTEM III.

2002 ◽  
Vol 01 (02) ◽  
pp. 285-293 ◽  
Author(s):  
HIDEYUKI KAMISAKA ◽  
HIROKI NAKAMURA ◽  
SHINKOH NANBU ◽  
MUTSUMI AOYAGI ◽  
WENSHENG BIAN ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Potential Energy ◽  
Chemical Reactions ◽  
Reaction Mechanisms ◽  
Potential Energy Surfaces ◽  
Quantum Dynamics ◽  
Total Angular Momentum ◽  
Nonadiabatic Transitions ◽  
Angular Momentum Quantum Number ◽  
Energy Surfaces

Using the accurate global potential energy surfaces for the 11A′′ and 21A′ states reported in the previous sister Paper I, detailed quantum dynamics calculations are performed for these adiabatic surfaces separately for J = 0 (J: total angular momentum quantum number). In addition to the significant overall contributions of these states to the title reactions reported in the second Paper II of this series, quantum dynamics on these excited potential energy surfaces (PES) are clarified in terms of the PES topographies, which are quite different from that of the ground PES. The reaction mechanisms are found to be strongly selective and nicely explained as vibrationally nonadiabatic transitions in the vicinity of potential ridge.

scholarly journals Photodissociation of the CH3O and CH3S radical molecules: an ab initio electronic structure study

2017 ◽  
Vol 19 (46) ◽  
pp. 31245-31254 ◽  
Author(s):  
A. Bouallagui ◽  
A. Zanchet ◽  
O. Yazidi ◽  
N. Jaïdane ◽  
L. Bañares ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Potential Energy ◽  
Ab Initio ◽  
Potential Energy Surfaces ◽  
Structure Study ◽  
Spin Orbit ◽  
Energy Surfaces ◽  
Ab Initio Electronic Structure

Potential-energy surfaces and spin–orbit couplings involved in the photodissociation of the CH3O and CH3S radicals have been investigated.

Fitting potential energy surfaces to sum-of-products form with neural networks using exponential neurons

2017 ◽  
Vol 16 (05) ◽  
pp. 1730001 ◽  
Author(s):  
Alex Brown ◽  
E. Pradhan
Keyword(s):  
Neural Network ◽  
Potential Energy ◽  
Ab Initio ◽  
Potential Energy Surfaces ◽  
Quantum Dynamics ◽  
The Neural Network ◽  
Sum Of Products ◽  
High Level ◽  
Energy Surfaces ◽  
Dynamics Problems

In this paper, the use of the neural network (NN) method with exponential neurons for directly fitting ab initio data to generate potential energy surfaces (PESs) in sum-of-product form will be discussed. The utility of the approach will be highlighted using fits of CS2, HFCO, and HONO ground state PESs based upon high-level ab initio data. Using a generic interface between the neural network PES fitting, which is performed in MATLAB, and the Heidelberg multi-configuration time-dependent Hartree (MCTDH) software package, the PESs have been tested via comparison of vibrational energies to experimental measurements. The review demonstrates the potential of the PES fitting method, combined with MCTDH, to tackle high-dimensional quantum dynamics problems.

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