Electronic structure aspects of the spin-forbidden reaction CH3(X 2A2″) + N(4S)→HCN(X 1∑+) + H2(X 1g +)

Rovshan Sadygov, David R. Yarkony

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Second order configuration interaction wave functions based on molecular orbitals determined from a state-averaged multiconfigurational self-consistent field procedure are used to investigate the intermediate complex driven model for the spin-forbidden reaction CH3(X 2A2″) + N(4S)→HCN(X 1+) + H2(X 1+). The minimum energy crossing point (MECP), the minimum energy point on the surface of intersection connecting the reactant channel, 3A″ potential energy surface, and product channel 1A′ potential energy surface, is determined directly, i.e., without a priori characterization of the individual potential energy surfaces. The MECP is found to be 8.2 kcal/mol below of the reactants. The structure at the MECP clearly evinces the incipient formation of a H2 bond. Barrierless paths from the reactants to the intermediate complex-methylnitrene, from the intermediate complex to the MECP, and from the MECP to the products are established. The absence of a barrier on these paths supports the intermediate complex mechanism. Spin-orbit interactions are determined to be ∼30cm-1 for points on the surface of intersection in the vicinity of the MECP. Spin-orbit interactions and the local potential surface topology at the MECP are used to probe the efficiency of the intersystem crossing using the Landau-Zener model. A reduced dimensionality model is proposed.

Original languageEnglish (US)
Pages (from-to)4994-4999
Number of pages6
JournalJournal of Chemical Physics
Volume107
Issue number13
StatePublished - Oct 1 1997
Externally publishedYes

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Potential energy surfaces
Electronic structure
electronic structure
Orbits
Molecular orbitals
Wave functions
energy
potential energy
spin-orbit interactions
Topology
intersections
products
configuration interaction
self consistent fields
molecular orbitals
topology
wave functions
probes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Electronic structure aspects of the spin-forbidden reaction CH3(X 2A2″) + N(4S)→HCN(X 1∑+) + H2(X 1g +). / Sadygov, Rovshan; Yarkony, David R.

In: Journal of Chemical Physics, Vol. 107, No. 13, 01.10.1997, p. 4994-4999.

Research output: Contribution to journalArticle

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