Negative- and positive-ion fragmentation of core-excited formic-acid molecules studied with three- and four-ion coincidence spectroscopy
Stråhlman, Christian; Kivimäki, Antti; Richter, Robert; Sankari, Rami (2017-08-08)
Stråhlman, C., Kivimäki, A., Richter, R., Sankari, R. (2017) Negative- and positive-ion fragmentation of core-excited formic-acid molecules studied with three- and four-ion coincidence spectroscopy. Physical Review A, 96 (2), doi:10.1103/PhysRevA.96.023409
©2017 American Physical Society
The negative-ion fragmentation of formic acid (HCOOH) is studied with negative- and positive-ion coincidence spectroscopy. We report four-body ionic fragmentation where up to three positive ions are collected in coincidence with one negative ion. We report yields for 21 three-body channels and five four-body channels. More than 80% of all negative-ion fragmentation involves production of O⁻, and it is dominated by complete dissociation of all molecular bonds. Negative-ion creation is most abundant at high-Rydberg resonances and just above the molecule’s core-ionization potentials. The existence of four-body fragmentation channels evidences a strong charge redistribution in the molecule.
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