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Role of electronic correlations in photoionization of NO2 in the vicinity of the 2A1/2B2 conical intersection
2017, Brambila, Danilo S., Harvey, Alex G., Houfek, Karel, Mašín, Zdeněk, Smirnova, Olga
We present the first ab initio multi-channel photoionization calculations for NO2 in the vicinity of the 2A1/2B2 conical intersection, for a range of nuclear geometries, using our newly developed set of tools based on the ab initio multichannel R-matrix method. Electronic correlation is included in both the neutral and the scattering states of the molecule via configuration interaction. Configuration mixing is especially important around conical intersections and avoided crossings, both pertinent for NO2, and manifests itself via significant variations in photoelectron angular distributions. The method allows for a balanced and accurate description of the photoionization/photorecombination for a number of different ionic channels in a wide range of photoelectron energies up to 100 eV. Proper account of electron correlations is crucial for interpreting time-resolved signals in photoelectron spectroscopy and high harmonic generation (HHG) from polyatomic molecules.
NO2molecular frame photoelectron angular distributions for a range of geometries using the R-matrix method
2015, Brambila, Danilo S., Harvey, Alex G., Mašín, Zdeněk, Smirnova, Olga
We present R-matrix calculations of photoionization from NO2, resolved in energy, angle, and both neutral and ionic state, for a range of molecular geometries, including in the vicinity of the 2A1/2B2 conical intersection.
Recent developments in R-matrix applications to molecular processes
2015, Mašín, Zdeněk, Harvey, Alex, Houfek, Karel, Brambila, Danilo S., Morales, Felipe, Gorfinkiel, Jimena D., Tennyson, Jonathan, Smirnova, Olga
We report on recent developments of the UKRmol suite, an implementation of the molecular R- matrix method and present examples of the calculations (e.g. electron scattering, photoionization, high harmonic generation, etc.) it has enabled.