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Vibrational and shake-up excitations in the C 1s photoionization of ethane and deuterated ethane

MPS-Authors
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Rennie,  Emma E.
Fritz Haber Institute, Max Planck Society;

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Köppe,  H. M.
Fritz Haber Institute, Max Planck Society;

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Kempgens,  Brigitte
Fritz Haber Institute, Max Planck Society;

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Hergenhahn,  Uwe       
Fritz Haber Institute, Max Planck Society;

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Kivimäki,  A.
Fritz Haber Institute, Max Planck Society;

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Maier,  Klaus
Fritz Haber Institute, Max Planck Society;

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Neeb,  M.
Fritz Haber Institute, Max Planck Society;

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Rüdel,  Andy
Fritz Haber Institute, Max Planck Society;

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Bradshaw,  Alexander M.
Fritz Haber Institute, Max Planck Society;

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Citation

Rennie, E. E., Köppe, H. M., Kempgens, B., Hergenhahn, U., Kivimäki, A., Maier, K., et al. (1999). Vibrational and shake-up excitations in the C 1s photoionization of ethane and deuterated ethane. Journal of Physics B, 32(11), 2691-2706. doi:10.1088/0953-4075/32/11/316.


Cite as: https://hdl.handle.net/21.11116/0000-0008-C8F8-F
Abstract
The absolute photoabsorption spectra of ethane (C2H6), encompassing the C 1s-1 3p excitation, the C 1s threshold and the satellite thresholds is measured. Further, photoelectron spectra are taken in the region from the C 1s threshold region up to 380 eV, and the vibrational fine structure and C 1s-1 partial cross section studied. The complex vibrational fine structure for both ethane and deuterated ethane (C2D6) is analysed using a coupled least-squares fit procedure. While we cannot exclude the presence of the C-C stretching mode (ν3), the experimental data show that the C 1s photoelectron spectrum is dominated by two vibrational modes, the C-H stretch ν1 and the C-H deformation mode ν2. Compared with their values in the neutral ground state there is a significant increase in the vibrational energies to 407±5 meV and 176±5 meV for ethane and 291±10 meV and 130±10 meV for deuterated ethane, respectively. The lifetime broadening is determined to be 98±10 meV, which is in good agreement with calculations. The investigated shake-up structure closely resembles that of methane. The lowest-lying satellite band gains intensity towards threshold which may be attributed to conjugate shake-up processes.