TY - JOUR
T1 - Gas-Phase Photolysis of Hg(I) Radical Species
T2 - A New Atmospheric Mercury Reduction Process
AU - Saiz-Lopez, Alfonso
AU - Acuña, A. Ulises
AU - Trabelsi, Tarek
AU - Carmona-García, Javier
AU - Dávalos, Juan Z.
AU - Rivero, Daniel
AU - Cuevas, Carlos A.
AU - Kinnison, Douglas E.
AU - Sitkiewicz, Sebastian P.
AU - Roca-Sanjuán, Daniel
AU - Francisco, Joseph S.
N1 - Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/6/5
Y1 - 2019/6/5
N2 - The efficient gas-phase photoreduction of Hg(II) has recently been shown to change mercury cycling significantly in the atmosphere and its deposition to the Earth's surface. However, the photolysis of key Hg(I) species within that cycle is currently not considered. Here we present ultraviolet-visible absorption spectra and cross-sections of HgCl, HgBr, HgI, and HgOH radicals, computed by high-level quantum-chemical methods, and show for the first time that gas-phase Hg(I) photoreduction can occur at time scales that eventually would influence the mercury chemistry in the atmosphere. These results provide new fundamental understanding of the photobehavior of Hg(I) radicals and show that the photolysis of HgBr increases atmospheric mercury lifetime, contributing to its global distribution in a significant way.
AB - The efficient gas-phase photoreduction of Hg(II) has recently been shown to change mercury cycling significantly in the atmosphere and its deposition to the Earth's surface. However, the photolysis of key Hg(I) species within that cycle is currently not considered. Here we present ultraviolet-visible absorption spectra and cross-sections of HgCl, HgBr, HgI, and HgOH radicals, computed by high-level quantum-chemical methods, and show for the first time that gas-phase Hg(I) photoreduction can occur at time scales that eventually would influence the mercury chemistry in the atmosphere. These results provide new fundamental understanding of the photobehavior of Hg(I) radicals and show that the photolysis of HgBr increases atmospheric mercury lifetime, contributing to its global distribution in a significant way.
UR - https://www.scopus.com/pages/publications/85066843938
U2 - 10.1021/jacs.9b02890
DO - 10.1021/jacs.9b02890
M3 - Article
C2 - 31117649
AN - SCOPUS:85066843938
SN - 0002-7863
VL - 141
SP - 8698
EP - 8702
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 22
ER -