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Extreme ultraviolet pulses produced by high order harmonic generation are used to probe ultrafast atomic and molecular dynamics. States of high field ionization, coherent superpositions, and alignment are obtained by core level transient absorption spectroscopy.
Combining results from several techniques of attosecond spectroscopy, we show that ionization gating of high-harmonic emission on the leading edge of the driving pulse produces isolated attosecond pulses with a contrast ratio (the energy in the main pulse normalized to the energy in adjacent satellite pulses) c=3.3±0.2. Half-cycle cutoff analysis confirms that harmonic generation proceeds in the ionization-gated...
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