Theoretical study of ArH+ dissociative recombination and electron-impact vibrational excitation

Cross-sections are presented for dissociative recombination and electron-impact vibrational excitation of the ArH+ molecular ion at electron energies appropriate for the interstellar environment. The R-matrix method is employed to determine the molecular structure data, i.e. the position and width of the resonance states. The cross-sections and the corresponding Maxwellian rate coefficients are computed using a method based on the Multichannel Quantum Defect Theory. The main result of the paper is the very low dissociative recombination rate found at temperatures below 1000K. This is in agreement with the previous upper limit measurement in merged beams and offers a realistic explanation for the presence of ArH+ in exotic interstellar conditions

Detection of titanium nanoparticles in the hair shafts of a patient with frontal fibrosing alopecia

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Alopécie frontale fibrosante post-ménopausique : une réaction lichénoïde aux nanoparticules de dioxyde de titane présentes dans les follicules pileux ?

International audienceL’alopécie fibrosante frontale (AFF) post-ménopausique est une pathologie émergente dont l’incidence augmente dans l’ensemble des pays. Son origine reste inconnue. Nous rapportons la présence de dioxyde de titane dans les cheveux d’une patiente atteinte d’AFF

Theoretical study of ArH+ dissociative recombination and electron-impact vibrational excitation

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A theoretical study of the dissociative recombination of SH + with electrons through the 2 Π states of SH

International audienceA quantitative theoretical study of the dissociative recombination of SH+ with electrons has been carried out. Multireference, configuration interaction calculations were used to determine accurate potential energy curves for SH+ and SH. The block diagonalization method was used to disentangle strongly interacting SH valence and Rydberg states and to construct a diabatic Hamiltonian whose diagonal matrix elements provide the diabatic potential energy curves. The off-diagonal elements are related to the electronic valence-Rydberg couplings. Cross sections and rate coefficients for the dissociative recombination reaction were calculated with a stepwise version of the multichannel quantum defect theory, using the molecular data provided by the block diagonalization method. The calculated rates are compared with the most recent measurements performed on the ion Test Storage Ring (TSR) in Heidelberg, Germany

Dissociative recombination and vibrational excitation of BF+ in low energy electron collisions

WOS:000385494000003International audienceThe latest molecular data-potential energy curves and Rydberg-valence interactions-characterising the super-excited electronic states of BF are reviewed in order to provide the input for the study of their fragmentation dynamics. Starting from this input, the main paths and mechanisms of BF+ dissociative recombination and vibrational excitation are analysed. Their cross sections are computed for the first time using a method based on the multichannel quantum defect theory (MQDT), and Maxwellian rate-coefficients are calculated and displayed in ready-to-be-used format for low temperature plasma kinetics simulations

Electron-impact excitation and recombination of molecular cations in cold ionized gases: application to H 2+ , BeH + , CH + , CO + , N 2+ , BF + and AlO +

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