Waveforms with durations short enough to probe the electronic timescale can be generated both in the extreme UV and in the IR-VIS region of the electromagnetic spectrum . In the deep UV (DUV), where for example many basic aromatic molecules absorb radiation and undergo photochemical reactions , pulses with such extremely short durations have not yet been demonstrated. A fundamental difficulty is rooted in the large group velocity dispersion of any optical component in the DUV, causing a DUV pulse to be readily broadened and distorted before it reaches the sample. The present record for the shortest DUV pulses is 2.8 fs .
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