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Highly accurate probing techniques aid in understanding complex
atomic electron systems. Some examples of complex atomic electron
systems include multi-electron atoms, molecules, and atomic
electrons in external electric fields. The techniques of
scaled-energy recurrence spectroscopy, a Fourier transform method,
are used in this dissertation to study the dynamics of
highly-excited two-electron atoms created in a static electric
field. In other experiments discussed here, ultra-short pulses of
terahertz radiation, so called half-cycle pulses, are used to
ionize highly-excited Stark eigenstates, probing their electronic
probability distributions in momentum space. Through these studies
the characteristics of Stark states, ultra-short pulsed terahertz
radiation, and the limitations and accuracy of these probing
techniques are explored.
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