Figure 2
The time series in panels (a) and (b) show the integrated absorbance (corrected for the TDM ratio and averaged over five MIS experiments) of the bands attributed to background-deposited water [
-H
O (+) and
-H
O (×) and their sum (▽)] and to magnetically focused beam-deposited water [panel (b):
-H
O (□) and
-H
O (○) and their sum (Δ)] in Kr at 13 K, respectively. Panel (c) displays the relative abundances of
-H
O and
-H
O for which experimental uncertainties range from 10
(at short times) to 2.5
as estimated from the standard deviation over five MIS experiments. Panel (d) displays the spectroscopic OPR for background-deposited H
O (*) and magnetically focused beam-deposited H
O (◊) in Kr at 13 K. Panel (e) displays the spectroscopic OPR of background-deposited H
O and magnetically focused beam-deposited H
O in Kr at 8 K. The vertical line indicates when beam and background deposition were interrupted (i.e., at
s) whereby NSC slowly drove the nuclear spin isomers populations towards their equilibrium distribution. Results from a simple first-order kinetics model describing the coupled growth and decay kinetics [
36], displayed as continuous lines in panels (c)–(e), yielded the effective NCS rate constant,
, as well as the initial (displayed by filled red and blue squares) and final relative abundances and OPR of background-deposited H
O and magnetically focused beam-deposited H
O.
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