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Fractional intensity changes between three different pump–probe delays, displayed as I ( k x , k y , Δ t 2 )/ I ( k x , k y , Δ t 1 ) − 1: First, the intensity of the main lattice peaks (and superstructure reflexes) is reduced, while the background increases primarily at the Brillouin zone boundary (black). At larger delays, a further suppression of the main lattice peaks is accompanied by an increase only in their vicinity. After 200 ps, only minor changes are observed before cooling sets in on a nanosecond timescale.

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