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@ARTICLE{Wang:599196,
author = {Wang, Enliang and Kling, Nora G and LaForge, Aaron C and
Obaid, Razib and Pathak, Shashank and Bhattacharyya,
Surjendu and Meister, Severin and Trost, Florian and
Lindenblatt, Hannes and Schoch, Patrizia and Kübel,
Matthias and Pfeifer, Thomas and Rudenko, Artem and
Díaz-Tendero, Sergio and Martín, Fernando and Moshammer,
Robert and Rolles, Daniel and Berrah, Nora},
title = {{U}ltrafast {R}oaming {M}echanisms in {E}thanol {P}robed by
{I}ntense {E}xtreme {U}ltraviolet {F}ree-{E}lectron {L}aser
{R}adiation: {E}lectron {T}ransfer versus {P}roton
{T}ransfer},
journal = {The journal of physical chemistry letters},
volume = {14},
number = {18},
issn = {1948-7185},
address = {Washington, DC},
publisher = {ACS},
reportid = {PUBDB-2023-07220},
pages = {4372 - 4380},
year = {2023},
abstract = {Ultrafast H$_2$$^+$ and H$_3$$^+$ formation from ethanol is
studied using pump-probe spectroscopy with an extreme
ultraviolet (XUV) free-electron laser. The first pulse
creates a dication, triggering H2 roaming that leads to
H$_2$$^+$ and H$_3$$^+$ formation, which is disruptively
probed by a second pulse. At photon energies of 28 and 32
eV, the ratio of H$_2$$^+$ to H$_3$$^+$ increases with time
delay, while it is flat at a photon energy of 70 eV. The
delay-dependent effect is ascribed to a competition between
electron and proton transfer. High-level quantum chemistry
calculations show a flat potential energy surface for H$_2$
formation, indicating that the intermediate state may have a
long lifetime. The ab initio molecular dynamics simulation
confirms that, in addition to the direct emission, a small
portion of H$_2$ undergoes a roaming mechanism that leads to
two competing pathways: electron transfer from H2 to
C$_2$H$_4$O$_2$$^+$ and proton transfer from
C$_2$H$_4$O$_2$$^+$ to H$_2$.},
cin = {DOOR ; HAS-User},
ddc = {530},
cid = {I:(DE-H253)HAS-User-20120731},
pnm = {6G2 - FLASH (DESY) (POF4-6G2) / FS-Proposal: F-20180563
(F-20180563)},
pid = {G:(DE-HGF)POF4-6G2 / G:(DE-H253)F-20180563},
experiment = {EXP:(DE-H253)F-FL26-20150901},
typ = {PUB:(DE-HGF)16},
pubmed = {37140167},
UT = {WOS:000985563500001},
doi = {10.1021/acs.jpclett.2c03764},
url = {https://bib-pubdb1.desy.de/record/599196},
}