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Theoretical Prediction and Interpretation of 237Np Mössbauer Isomer Shifts

Journal Article · · Journal of Chemical Theory and Computation
Different theoretical approaches for the calculation of 237Np Mössbauer isomer shifts are investigated. The traditional contact density route is compared to a previously proposed alternative approach that uses energy derivatives with respect to the nuclear radius. Both approaches yield similar results as long as suitable basis sets augmented with large exponents and relativistic methods are used. Density functional theory (DFT) calculations do not show a strong dependency of the 237Np isomer shift on the chosen functional. Wavefunction calculations show that dynamic electron correlation can be important when covalent bonding influences the isomer shift. Effects from spin–orbit coupling are small. The isomer shifts of ionic solids and Np(III) organometallic complexes are largely governed by the oxidation state of Np. Isomer shifts of organometallic Np(IV) complexes are strongly affected by donation bonding. Furthermore, detailed analysis of the wavefunction results with different active spaces demonstrates that correlation among the outer core Np and occupied ligand frontier orbitals contributes significantly to isomer shifts of Np(IV) compounds.
Research Organization:
University at Buffalo, State University of New York, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001136
OSTI ID:
2478534
Alternate ID(s):
OSTI ID: 1977911
Journal Information:
Journal of Chemical Theory and Computation, Journal Name: Journal of Chemical Theory and Computation Journal Issue: 10 Vol. 17; ISSN 1549-9618
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (80)

Probing Multiconfigurational States by Spectroscopy: The Cerium XAS L 3 ‐edge Puzzle journal March 2021
Dependence of relativistic effects on electronic configuration in the neutral atoms of d- and f-block elements journal April 2002
Optimized Slater-type basis sets for the elements 1-118 journal May 2003
Even-tempered slater-type orbitals revisited: From hydrogen to krypton journal January 2004
Dirac–Fock Atomic Electronic Structure Calculations Using Different Nuclear Charge Distributions journal November 1997
Methodology of the Np237 Mössbauer Effect book January 1968
Density matrix averaged atomic natural orbital (ANO) basis sets for correlated molecular wave functions: I. First row atoms journal January 1990
Systematic trends in the237neptunium Mössbauer isomer shift: Overlap of IV, V and VI neptunium oxidation states and correlation between isomer shift and crystal structure journal January 1988
Relativistic double-zeta, triple-zeta, and quadruple-zeta basis sets for the actinides Ac–Lr journal October 2006
Mössbauer spectroscopy for heavy elements: a relativistic benchmark study of mercury journal March 2011
Chemical Information revealed by Mössbauer spectroscopy and DFT calculations journal February 2017
Benchmark study of DFT with Eu and Np Mössbauer isomer shifts using second-order Douglas-Kroll-Hess Hamiltonian journal February 2018
A mean-field spin-orbit method applicable to correlated wavefunctions journal March 1996
Crystal chemistry and 237Np mössbauer investigations of neptunyl(vi) carbonate NpO2CO3 journal July 1986
The lamb shift in hydrogen-like atoms, 1 ⩽ Z ⩽ 110 journal November 1985
A complete active space SCF method (CASSCF) using a density matrix formulated super-CI approach journal May 1980
Preparation, chemical reactions, and some physical properties of neptunium pentafluoride journal April 1993
The restricted active space (RAS) state interaction approach with spin–orbit coupling journal May 2002
A model for describing paramagnetic Mössbauer relaxation spectra of organometallic 237Np compounds journal December 1987
Prediction and interpretation of the 57Fe isomer shift in Mössbauer spectra by density functional theory journal September 2002
The density-matrix renormalization group in the age of matrix product states journal January 2011
First principles calculation of Mössbauer isomer shift journal March 2009
The Douglas–Kroll–Hess electron density at an atomic nucleus journal November 2008
Multiconfiguration Pair-Density Functional Theory: A New Way To Treat Strongly Correlated Systems journal December 2016
Organometallic Neptunium Chemistry journal August 2017
A Nonorthogonal State-Interaction Approach for Matrix Product State Wave Functions journal November 2016
OpenMolcas: From Source Code to Insight journal September 2019
Puzzling Lack of Temperature Dependence of the PuO 2 Magnetic Susceptibility Explained According to Ab Initio Wave Function Calculations journal January 2017
Covalency of Neptunium(IV) Organometallics from Neptunium-237 Mössbauer Spectra book July 1981
Relativistic effects in structural chemistry journal May 1988
Electric Field Gradients Calculated from Two-Component Hybrid Density Functional Theory Including Spin−Orbit Coupling journal August 2010
Theoretical 57 Fe Mössbauer Spectroscopy for Structure Elucidation of [Fe] Hydrogenase Active Site Intermediates journal November 2013
Moessbauer and magnetic susceptibility studies of uranium(III), uranium(IV), neptunium(IV) compounds with the cyclopentadiene ion journal August 1972
Covalency of neptunium(IV) tris(cyclopentadienyl) compounds from Moessbauer spectra journal August 1979
Ab Initio Calculation of Vibrational Absorption and Circular Dichroism Spectra Using Density Functional Force Fields journal November 1994
Second-order perturbation theory with a CASSCF reference function journal July 1990
Bis(cyclooctatetraenyl)neptunium(III) and -plutonium(III) compounds journal October 1974
Main Group Atoms and Dimers Studied with a New Relativistic ANO Basis Set December 2003
New Relativistic ANO Basis Sets for Transition Metal Atoms journal July 2005
Theoretical 57 Fe Mössbauer spectroscopy: isomer shifts of [Fe]-hydrogenase intermediates journal January 2014
f-Orbital covalency in the actinocenes (An = Th–Cm): multiconfigurational studies and topological analysis journal January 2014
Benchmark study of the Mössbauer isomer shifts of Eu and Np complexes by relativistic DFT calculations for understanding the bonding nature of f-block compounds journal January 2015
Nuclear size effects in vibrational spectra journal January 2016
Mössbauer isomer shifts and effective contact densities obtained by the exact two-component (X2C) relativistic method and its local variants journal January 2020
New electron correlation theories for transition metal chemistry journal January 2011
Structural parameters and unit cell dimensions for the tetragonal actinide tetrachlorides(Th, Pa, U, and Np) and tetrabromides (Th and Pa) journal January 1973
Isomer shifts in neptunium compounds journal January 1967
Introduction of n -electron valence states for multireference perturbation theory journal June 2001
Density functional investigations of the properties and thermochemistry of UF[sub n] and UCl[sub n] (n=1,…,6) journal January 2004
Quasirelativistic theory equivalent to fully relativistic theory journal December 2005
An infinite-order two-component relativistic Hamiltonian by a simple one-step transformation journal February 2007
On the calculation of Mössbauer isomer shift journal August 2007
Optical and magnetic properties of the 5f[sup 1]AnX[sub 6][sup q−] series: A theoretical study journal January 2009
Exact two-component Hamiltonians revisited journal July 2009
Basis set representation of the electron density at an atomic nucleus journal October 2010
Gaussian basis sets for use in correlated molecular calculations. I. The atoms boron through neon and hydrogen journal January 1989
Gaussian basis sets for use in correlated molecular calculations. III. The atoms aluminum through argon journal January 1993
Density‐functional thermochemistry. III. The role of exact exchange journal April 1993
Relativistic regular two‐component Hamiltonians journal September 1993
Rationale for mixing exact exchange with density functional approximations journal December 1996
Interfacing relativistic and nonrelativistic methods. I. Normalized elimination of the small component in the modified Dirac equation journal June 1997
Ab initio model potential embedded-cluster study of the ground and lowest excited states of Cr3+ defects in the elpasolites Cs2NaYCl6 and Cs2NaYBr6 journal February 1998
Toward reliable density functional methods without adjustable parameters: The PBE0 model journal April 1999
Gaussian basis sets for use in correlated molecular calculations. IX. The atoms gallium through krypton journal April 1999
Geometry optimizations in the zero order regular approximation for relativistic effects journal May 1999
Commentary: The Materials Project: A materials genome approach to accelerating materials innovation journal July 2013
Modern quantum chemistry with [Open]Molcas journal June 2020
The DIRAC code for relativistic molecular calculations journal May 2020
Relativistic atomic orbital contractions and expansions: magnitudes and explanations journal October 1990
Isomer Shift and Hyperfine Splittings of the 59.6-keV Mössbauer Resonance in Np 237 journal July 1968
Development of the Colle-Salvetti correlation-energy formula into a functional of the electron density journal January 1988
Calculation of Isomer Shift in Mössbauer Spectroscopy journal May 1972
Density matrix formulation for quantum renormalization groups journal November 1992
Generalized Gradient Approximation Made Simple journal October 1996
Crystal chemical studies of the 5f-series of elements. XII. New compounds representing known structure types journal December 1949
Effective ionic radii in oxides and fluorides journal May 1969
Accurate spin-dependent electron liquid correlation energies for local spin density calculations: a critical analysis journal August 1980
A theoretical study of the structures and chemical bonds of neptunium (III) molecules by a density functional method journal October 2014
The density matrix renormalization group for ab initio quantum chemistry journal September 2014
The Density Matrix Renormalization Group in Quantum Chemistry journal May 2011

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