Electron spectroscopy and dynamics of HBr around the Br 1s⁻¹ threshold
Boudjemia, Nacer; Jänkälä, Kari; Püttner, Ralph; Marchenko, Tatiana; Travnikova, Oksana; Guillemin, Renaud; Journel, Loïc; Ismail, Iyas; Koulentianos, Dimitris; Kosugi, Satoshi; Azuma, Yoshiro; Patanen, Minna; Huttula, Marko; Céolin, Denis; Piancastelli, Maria Novella; Simon, Marc (2020-11-12)
Boudjemia, N., Jänkälä, K., Püttner, R., Marchenko, T., Travnikova, O., Guillemin, R., Journel, L., Ismail, I., Koulentianos, D., Kosugi, S., Azuma, Y., Patanen, M., Huttula, M., Céolin, D., Piancastelli, M. N., & Simon, M. (2020). Electron spectroscopy and dynamics of HBr around the Br 1s−1 threshold. Physical Chemistry Chemical Physics, 22(46), 26806–26818. https://doi.org/10.1039/d0cp04787b
This journal is © the Owner Societies 2020. This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.
https://creativecommons.org/licenses/by-nc/3.0/
https://urn.fi/URN:NBN:fi-fe20201209100062
Tiivistelmä
Abstract
A comprehensive electron spectroscopic study combined with partial electron yield measurements around the Br 1s ionization threshold of HBr at ≅13.482 keV is reported. In detail, the Br 1s⁻¹ X-ray absorption spectrum, the 1s⁻¹ photoelectron spectrum as well as the normal and resonant KLL Auger spectra are presented. Moreover, the L-shell Auger spectra measured with photon energies below and above the Br 1s⁻¹ ionization energy as well as on top of the Br 1s⁻¹σ* resonance are shown. The latter two Auger spectra represent the second step of the decay cascade subsequent to producing a Br 1s⁻¹ core hole. The measurements provide information on the electron and nuclear dynamics of deep core-excited states of HBr on the femtosecond timescale. From the different spectra the lifetime broadening of the Br 1s⁻¹ single core-hole state as well as of the Br(2s⁻²,2s⁻¹2p⁻¹,2p⁻²) double core-hole states are extracted and discussed. The slope of the strongly dissociative HBr 2p⁻²σ* potential energy curve is found to be about −13.60 eV Å⁻¹. The interpretation of the experimental data, and in particular the assignment of the spectral features in the KLL and L-shell Auger spectra, is supported by relativistic calculations for HBr molecule and atomic Br.
Kokoelmat
- Avoin saatavuus [31941]