Take the rapid temperature jump to occur at . Neglect thermal expansion as in the stated constant- model. The composition is initially unchanged, so the curve is continuous through , with
(1)
It is horizontal at the first value before the jump, then decreases exponentially towards the lower second plateau, without overshoot:
(2)
The initial post-jump slope is negative, and the curve is concave upward. A discontinuous vertical step in the composition would incorrectly make a finite reaction happen instantaneously.
Figure 1.
Original normalized trans-concentration relaxation curve, continuous at the temperature jump and approaching its new lower plateau
. Details.

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