Browsing Chemistry & Biochemistry by Title
Now showing items 4-23 of 41
Basis set converged weak interaction energies from conventional and explicitly correlated coupled-cluster approach
(2020-01-16)
Interaction energies for seven weakly bound dimers involving helium, argon, water, and methane
are computed using large correlation-consistent basis sets augmented with bond functions. The estimates of the coupled-cluster ...
Cluster perturbation theory. I. Theoretical foundation for a coupled cluster target state and ground-state energies
(2020-05-20)
We introduce a new class of perturbation models-the cluster perturbation (CP) models-where the major drawbacks of Moller-Plesset perturbation theory and coupled cluster perturbation theory have been eliminated. In CP theory, ...
Cluster perturbation theory. II. Excitation energies for a coupled cluster target state
(2020-05-07)
In cluster perturbation (CP) theory, we consider a target excitation space relative to a Hartree-Fock state and partition the target excitation space into a parent excitation space and an auxiliary excitation space. The ...
Cluster perturbation theory. III. Perturbation series for coupled cluster singles and doubles excitation energies
(2020-05-07)
The cluster perturbation series, CPS(D), for coupled cluster singles and doubles excitation energies is considered. It is demonstrated that the second-order model CPS(D-2) is identical to the configuration interaction ...
Cluster perturbation theory. IV. Convergence of cluster perturbation series for energies and molecular properties
(2020-05-20)
The theoretical foundation has been developed for establishing whether cluster perturbation (CP) series for the energy, molecular properties, and excitation energies are convergent or divergent and for using a two-state ...
Cluster perturbation theory. V. Theoretical foundation for cluster linear target states
(2020-05-20)
Cluster perturbation (CP) theory was developed in Paper I [F. Pawlowski et al., J. Chem. Phys. 150, 134108 (2019)] for a coupled cluster (CC) target state and is extended in this paper to comprehend a cluster linear (CL) ...
Communication: Water activation and splitting by single metal-atom anions
(2020-06-25)
We report experimental and computational results pertaining to the activation and splitting of single water molecules by single atomic platinum anions. The anion photoelectron spectra of [Pt(H2O)](-), formed under different ...
Delocalized water and fluoride contributions to Dyson orbitals for electron detachment from the hydrated fluoride anion
(2021-01-26)
The experimental vertical electron detachment energy VEDE of aqueous fluoride, F− H2O , is
approximately 9.8 eV, but spectral assignment is complicated by interference between F− 2p and
H2O 1b1 orbitals. The electronic ...
Dependence of the multipole moments, static polarizabilities, and static hyperpolarizabilities of the hydrogen molecule on the H-H separation in the ground singlet state
(2020-06-25)
In this work, we provide values for the quadrupole moment Theta, the hexadecapole moment Phi, the dipole polarizability alpha, the quadrupole polarizability C, the dipole-octopole polarizability E, the second dipole ...
Direct ΔMBPT(2) method for ionization potentials, electron affinities, and excitation energies using fractional occupation numbers
(2020-01-16)
A direct method (D-ΔMBPT(2)) to calculate second-order ionization potentials (IPs), electron affinities (EAs), and excitation energies is developed. The ΔMBPT(2) method is defined as the correlated extension of the ΔHF ...
Double Rydberg anions with solvated ammonium kernels: Electron binding energies and Dyson orbitals
(2020-03-10)
Ab initio electron-propagator calculations on the electron detachment energies and associated Dyson orbitals of NnH3n+1- for n = 1-5 confirm the assignment of low-energy peaks in anion photoelectron spectra to double Rydberg ...
Efficient evaluation of analytic Fukui functions
(2021-01-26)
An efficient method for the analytic evaluation of Fukui functions is proposed. Working equations
are derived and numerical results are used to validate the method on medium size set of molecules.
In addition to the ...
Electron binding energies and Dyson orbitals of Al(5)O(m)(-) (m=3,4,5) and Al(5)O(5)H(2)(-)
(2021-01-26)
Photoelectron spectra of Al5Om
− m=3–5 and of the anion produced by the dissociative adsorption
of a water molecule by Al5O4
− are interpreted with density-functional geometry optimizations and
electron-propagator ...
Electron propagator and coupled-cluster calculations on the photoelectron spectra of thiouracil and dithiouracil anions
(2021-01-26)
Electron affinities, vertical electron detachment energies, and isomerization energies of 4-thiouracil, 2-thiouracil, and 2,4-dithiouracil and their valence anions have been calculated with ab initio electron propagator ...
Electron propagator calculations on C-60 and C-70 photoelectron spectra
(2021-01-26)
Vertical ionization energies of C60 and C70 fullerenes are calculated with semidirect implementations
of electron propagator methods and a triple- plus polarization basis set. These predictions are in
close agreement ...
Eukaryotic N-Glycosylation Occurs via the Membrane-anchored C-terminal Domain of the Stt3p Subunit of Oligosaccharyltransferase
(2020-07-24)
N-Glycosylation is an essential and highly conserved protein
modification. In eukaryotes, it is catalyzed by a multisubunit
membrane-associated enzyme, oligosaccharyltransferase (OT).
We report the high resolution ...
Excitation energies, photoionization cross sections, and asymmetry parameters of the methyl and silyl radicals
(2020-01-16)
Vertical excitation energies of the methyl and silyl radicals were inferred from ab initio electron
propagator calculations on the electron affinities of CH3
+ and SiH3
+. Photoionization cross sections
and angular ...
First-order symmetry-adapted perturbation theory for multiplet splittings
(2020-06-25)
We present a symmetry-adapted perturbation theory (SAPT) for the interaction of two high-spin open-shell molecules (described by their restricted open-shell Hartree-Fock determinants) resulting in low-spin states of the ...
A generalized any-particle propagator theory: Prediction of proton affinities and acidity properties with the proton propagator
(2020-01-16)
We have recently extended the electron propagator theory to the treatment of any type of particle
using an Any-Particle Molecular Orbital (APMO) wavefunction as reference state. This approach,
called APMO/PT, has been ...