Two-dimensional Auger intensity of the C2H2 ss-DCH (C1s −2) Auger decay. (a) Experimental result. Only events where 4 electrons (2 photoelectrons and 2 Auger electrons) have been detected in coincidence are considered here. The sum of the photoelectron's energies is filtered in order to ensure that the main DCH state of C1s −2 configuration is reached, see Refs. 6,7. Electrons of less than 10 eV have been discarded to reduce background. In this representation, the faster Auger electron is reported on the x axis, while the slower one is on the y axis. Because of the 15 ns detector dead time, we are blind to the shaded zone, which corresponds to electron pairs of too close energies. (b) Calculated result with 6 eV width for Gaussian convolution. Here, the x axis corresponds to the first electron emitted in the Auger decay, while the y axis corresponds to the second Auger electron.
Experimental and theoretical 1D Auger intensity of the C2H2 ss-DCH (C1s −2) Auger decay. The experimental spectrum was obtained by the projection of the 2D Auger spectrum in Fig. 1(a). The vertical bars represent discrete calculated results without Gaussian convolution.
The experimental and theoretical Auger intensities as a function of CVV (panel (a)) or VVVV (panel (b)) binding energy. In the VVVV plot (panel (b)), contributions from the decays of the CVV states in the 2nd large peak (360–380 eV in the panel (a)) are also shown.
Experimental and theoretical total Auger intensity of the C2H2 ts-DCH (C1s −1C1s −1) Auger decay. Contributions of the 1st (DCH→CVV) and the 2nd (CVV→VVVV) Auger spectra are also shown.
(a) Comparison of experimental and theoretical 1D Auger intensity of the N2 ss-DCH (N1s −2) Auger decay, where theoretical Auger intensities are calculated without vibrational effect. The vertical bars represent discrete calculated results. (b) Effect of nuclear motion on the calculated Auger spectrum.
Potential energy curves (PECs) of the N2 neutral ground state, ss-DCH, CVV, and VVVV states. Only the lowest 40 states are shown for the CVV and VVVV states. For the sake of comparison, these PECs are shifted and referenced with respect to the lowest states in each group of PECs.
The 2D Auger intensity of the C2H2 ss-DCH satellite (C1s −2π−1π*+1) Auger decay: (a) experimental result obtained with the same procedure as for Fig. 1(a), and (b) calculated result with 6 eV width for Gaussian convolution. The meaning of the shaded area in the panel (a) is the same as in Fig. 1.
Experimental and theoretical 1D Auger intensity of the C2H2 ss-DCH satellite (C1s −2π−1π*+1) Auger decay. The vertical bars represent discrete calculated results without Gaussian convolution.
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