RT Journal Article
T1 Direct evidence of hydrogen-atom tunneling dynamics in the excited state hydrogen transfer (ESHT) reaction of phenol–ammonia clusters
A1 Rodríguez, Javier
A1 González, Marta
A1 Rubio-Lago, Luis
A1 Bañares Morcillo, Luis
AB The photodynamics of phenol–ammonia clusters, PhOH(NH3)3–5, after one UV photon absorption, has been investigated using velocity map imaging of the NH4(NH3)2–4 cluster products. The dependence of the NH4(NH3)2 translational energy distributions on the available energy reveals three dynamical regions in close correspondence with the photodissociation of bare phenol. At low excitation energies (between 282 and 260 nm), the NH4(NH3)2 distribution mirrors the hydrogen-atom passage through the 11 pp*–11 ps* barrier, constituting the first evidence of hydrogen-atom tunneling dynamics in an excited state hydrogen transfer (ESHT) reaction. At excitation wavelengths below 260 nm, the product distributions are consistent with two separate barrierless dissociation processes associated, respectively, with excitation to the 11 pp* and 21 pp* excited electronic states. Similar conclusions can be derived from the velocity map imaging results on the larger NH4(NH3)3,4 cluster products.
SN 1463-9076
YR 2014
FD 2014
LK https://hdl.handle.net/20.500.14352/94291
UL https://hdl.handle.net/20.500.14352/94291
LA eng
NO Ministerio de Economía y Competitividad (España)
NO Ministerio de Ciencia, Innovación y Universidades (España)
DS Docta Complutense
RD 7 oct 2024