A bit over a year ago we published our adcc code. In this work the aim was to develop a toolkit for computational spectroscopy methods focused on rapid development and interactive hands-on usage (see the blog article for details). Our target back then was to simplify method development involving the …

read more# Black-box inhomogeneous preconditioning for self-consistent field iterations in density-functional theory

For the past half a year or so Antoine Levitt and myself have been looking at a particular tricky busyness for solid-state density-functional theory (DFT) calculations, namely how to design efficient self-consistent field (SCF) schemes for large inhomogeneous systems. I have already previously reported on this matter in a short …

read more# Quantifying the error of the core-valence separation approximation

After only a few months of publishing our adcc paper, which introduces the novel algebraic-diagrammatic construction (ADC) code adcc, the package has already found mention in a number of related articles. One example is a manuscript on updates in the Psi4 quantum chemistry package, which features adcc as one of …

read more# A posteriori error estimation for the non-self-consistent Kohn-Sham equations

After about a year of work on the density-functional toolkit (DFTK) we finally started using the code for some new science. Given the mathematics background of the CERMICS the first two DFTK-related articles were not so much about large-scale applications, but rather deal some fundamental questions of Kohn-Sham density-functional theory …

read more# adcc: A versatile toolkit for rapid development of algebraic-diagrammatic construction methods

Over the part year or so a side project I have been working off and on has been the adcc code. This python module allows to perform excited states calculation for simulating molecular spectra based on algebraic-diagrammatic construction (ADC) methods. The speciality of the adcc code is that (a) multiple …

read more# Quantum chemistry with Coulomb Sturmians: Construction and convergence of Coulomb Sturmian basis sets at Hartree-Fock level

This week we submitted a paper related to our ongoing work regarding the use of Coulomb Sturmian basis functions in electronic structure theory. Given the recent progress, which has been made with regards to the evaluation of molecular integrals based on these exponential-type functions, molecular calculations based on Coulomb Sturmians …

read more# Embedding Combined with the Algebraic Diagrammatic Construction: Tackling Excited States in Biomolecular Systems

Yesterday the journal of chemical theory and computation accepted our manuscript titled

**Polarizable Embedding Combined with the Algebraic Diagrammatic Construction: Tackling Excited States in Biomolecular Systems**. In this work we describe the combination of the polarisable embedding (PE) scheme for including environmental effects with the algebraic-diagrammatic construction (ADC) approach.The …

read more# Towards quantum-chemical method development for arbitrary basis functions

Last week we submitted the molsturm design paper titled

**Towards quantum-chemical method development for arbitrary basis functions**. This manuscript is a condensed summary of the arguments about design and implementation of a basis-function independent self-consistent field scheme (SCF) already presented in my PhD thesis.Our approach to a basis-function-independent electronic …

read more# Publication of my PhD thesis

Finally, after quite some years of work I have successfully defended my PhD thesis with the title

**Development of a modular quantum-chemistry framework for the investigation of novel basis functions**on 22nd May. An electronic version of the text has now been published online.To make the topic of my …

read more# Oberwolfach reports: Molsturm modular electronic structure theory framework

As announced in my previous post about the Oberwolfach workshop on Mathematical Methods in Quantum Chemistry, the proceedings of each Oberwolfach workshop are published in the form of an article in the Oberwolfach reports. For this purpose each speaker is asked for an extended abstract summarising the content of his …

read more