#### Temperature
Dependent Part k_{TR} of the Reaction Rate

The temperature dependent part k_{TR }of the reaction rate_{ is
given by}

k_{TR} = k(T) - k(T = 0) - k_{TG}(T)
,

where k(T) is the measured acridine T_{1 triplet state decay
rate and} k_{TG}(T) ist the intramolecular triplet to ground
state decay
rate at

temperature T.

In the limit of low temperatures k(T = 0)
= k_{TR}(T = 0) + k_{TG}(T = 0) = 13.88 s^{-1}
(ODMR data point at 1.5 K)

with k_{TG}(T) = 28.75 s^{-1}exp(-501.5 K/T) (from acridine-d_{9}
data in fluorene-d_{8}D_{2}
below 200 K)

For the H-transfer a value of k_{TR}(T = 0) =
1.25 s^{-1}
could be evaluated separately
from the low
temperature (< 200 K) pressure dependent measurements. For the
D-transfer this was not possible, as in
this case k_{TR}(T = 0) is expected to be
substantially smaller.

To obtain the complete H-transfer reaction rate the
value of k_{TR}(T
= 0) =
1.25 s^{-1} should be
added to the temperature
dependent rate data k_{TR }presented
here.

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