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We employ time-dependent R-matrix theory to study ultra-fast dynamics in the doublet 2s2p2 configuration of C+ for a total magnetic quantum number M = 1. In contrast to the dynamics observed for M = 0, ultra-fast dynamics for M = 1 is governed by spin dynamics in which the 2s electron acts as a flag rather than a spectator electron. Under the assumption that mS = 1/2, m2s = 1/2 allows spin dynamics involving the two 2p electrons, whereas m2s = −1/2 prevents spin dynamics of the two 2p electrons. For a pump–probe pulse scheme with ωpump = 10.9 eV and ωprobe = 16.3 eV and both pulses six cycles long, little sign of spin dynamics is observed in the total ionization probability. Signs of spin dynamics can be observed, however, in the ejected-electron momentum distributions. We demonstrate that the ejected-electron momentum distributions can be used for unaligned targets to separate the contributions of initial M = 0 and M = 1 levels. This would, in principle, allow unaligned target ions to be used to obtain information on the different dynamics in the 2s2p2 configuration for the M = 0 and M = 1 levels from a single experiment.

Ultra-fast spin dynamics in the 2s2p2configuration of C+studied by time-dependentR-matrix theory

Ultra-fast spin dynamics in the 2s2p²configuration of C⁺studied by time-dependentR-matrix theory