Electron spectroscopy and dynamics of HBr around the Br 1s −1 threshold

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 spe...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2020-12, Vol.22 (46), p.26806-26818
Main Authors: 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
Format: Article
Language:English
Subjects:
Absorption spectra
Augers
Chemical Sciences
Crystallography
Electron spectroscopy
Ionization
or physical chemistry
Photoelectrons
Potential energy
Spectrum analysis
Theoretical and
X ray absorption
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Summary: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 −1 σ* 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 −1 2p −1 ,2p −2 )  double core-hole states are extracted and discussed. The slope of the strongly dissociative HBr 2p −2 σ* 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.
ISSN:1463-9076
1463-9084
1463-9084
DOI:10.1039/d0cp04787b