Simultaneous H/D and $^{13}$C/$^{12}$C anomalous kinetic isotope effects during the sonolysis of water in the presence of carbon monoxide - Archive ouverte HAL Access content directly
Journal Articles Journal of Physical Chemistry Letters Year : 2022

Simultaneous H/D and $^{13}$C/$^{12}$C anomalous kinetic isotope effects during the sonolysis of water in the presence of carbon monoxide

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Abstract

Splitting of water molecules driven by ultrasound plays a central role in sonochemistry. While studies of sonoluminescence revealed the formation of a plasma inside the cavitation bubble, much less is known about the contribution of plasma chemical processes to the sonochemical mechanisms. Herein, we report for the first time sonochemical processes in water saturated with pure CO. The presence of CO causes a large increase in the H/D kinetic isotope effect (KIE) to $\alpha_H$ = 14.6 ± 1.8 in a 10% H$_2$O/D$_2$O mixture under 20 kHz ultrasound.The anomalous H/D KIE is attributed to electron quantum tunneling in the plasma produced by cavitation. In addition, CO$_2$ formed simultaneously with hydrogen during the sonochemical process is enriched with the $^{13C}$C isotope, which indicates a VV pumping mechanism typical for non-equilibrium plasma. Both observed KIEs unambiguously point to the contribution of quantum effects in sonochemical mechanisms.
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Dates and versions

cea-03602469 , version 1 (10-10-2022)

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Sergey I. Nikitenko, Tony Chave, Matthieu Virot, Rachel Pflieger. Simultaneous H/D and $^{13}$C/$^{12}$C anomalous kinetic isotope effects during the sonolysis of water in the presence of carbon monoxide. Journal of Physical Chemistry Letters, 2022, 13, pp.42-48. ⟨10.1021/acs.jpclett.1c03744⟩. ⟨cea-03602469⟩
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