Coincidence momentum imaging of four- and three-body Coulomb explosion of formaldehyde in ultrashort intense laser fields
作者： Chien-Ming Tseng , Mizuho Fushitani , Akitaka Matsuda , Akiyoshi Hishikawa
DOI: 10.1016/J.ELSPEC.2018.07.001
关键词:
摘要: Abstract Ion-coincidence momentum imaging of Coulomb explosion formaldehyde (H2CO) in femtosecond intense laser fields (800 nm, 1.3 × 1015 W/cm2) is performed with two different pulse durations (7 fs and 35 fs). In the 7-fs fields, full fragmentation pathway from H2CO4+ → H+ + H+ + C+ + O+ identified. The angles between fragment momenta are well reproduced by a simple model geometry neutral formaldehyde, showing that molecular structure virtually frozen along bending coordinates during multiple ionization. Three-body pathways triply charged states, H2CO3+ → H+ + H+ + CO+ H+ + CH+ + O+, observed both 35-fs fields. Significant changes angle distribution asymmetric energy partitioning H+ ions case, which attributed to structural deformation prior longer pulse.
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