Fig. 2: Outline of the attosecond transient absorption measurement. | Nature Communications

Fig. 2: Outline of the attosecond transient absorption measurement.

From: Bringing weak transitions to light

Fig. 2

a Illustration of the experimental setup. CCD, charge-coupled device. b Relevant energy-level diagram in helium. c Absorption profile at 1.5-fs time delay (reddish-orange line) along with the result in the absence of the VIS pulse (blue line).

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