The photoelectron spectrum of elusive cyclic-N3 and characterization of the potential energy surface and vibrational states of the ion

2006 ◽  
Vol 125 (8) ◽  
pp. 084306 ◽  
Author(s):  
Dmitri Babikov ◽  
Vadim A. Mozhayskiy ◽  
Anna I. Krylov
Keyword(s):  
Potential Energy ◽  
Potential Energy Surface ◽  
Photoelectron Spectrum ◽  
Energy Surface ◽  
Vibrational States ◽  
Cyclic N3

scholarly journals Progress in calculating the potential energy surface of H 3 +

2012 ◽  
Vol 370 (1978) ◽  
pp. 5001-5013 ◽  
Author(s):  
Ludwik Adamowicz ◽  
Michele Pavanello
Keyword(s):  
Potential Energy ◽  
Potential Energy Surface ◽  
Energy Surface ◽  
Molecular Geometry ◽  
Computational Procedure ◽  
Energy Functional ◽  
Basis Functions ◽  
Vibrational States ◽  
Energy Gradient ◽  
Explicitly Correlated

The most accurate electronic structure calculations are performed using wave function expansions in terms of basis functions explicitly dependent on the inter-electron distances. In our recent work, we use such basis functions to calculate a highly accurate potential energy surface (PES) for the H ion. The functions are explicitly correlated Gaussians, which include inter-electron distances in the exponent. Key to obtaining the high accuracy in the calculations has been the use of the analytical energy gradient determined with respect to the Gaussian exponential parameters in the minimization of the Rayleigh–Ritz variational energy functional. The effective elimination of linear dependences between the basis functions and the automatic adjustment of the positions of the Gaussian centres to the changing molecular geometry of the system are the keys to the success of the computational procedure. After adiabatic and relativistic corrections are added to the PES and with an effective accounting of the non-adiabatic effects in the calculation of the rotational/vibrational states, the experimental H rovibrational spectrum is reproduced at the 0.1 cm −1 accuracy level up to 16 600 cm −1 above the ground state.

Accurate characterization of the lowest triplet potential energy surface of SO2 with a coupled cluster method

2019 ◽  
Vol 150 (14) ◽  
pp. 144303
Author(s):  
Praveen Kumar ◽  
Jacek Kłos ◽  
Bill Poirier ◽  
Millard H. Alexander ◽  
Hua Guo
Keyword(s):  
Potential Energy ◽  
Potential Energy Surface ◽  
Energy Surface ◽  
Cluster Method ◽  
Coupled Cluster ◽  
Coupled Cluster Method
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