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Two-body dissociation of formic acid following double ionization by ultrafast laser pulses

Journal Article · · Physical Review A

We studied the fragmentation of planar formic acid (HCOOH) molecules following their double ionization by intense ultrashort laser pulses. Deuterium tagging (i.e., HCOOD) combined with coincidence momentum imaging measurements of all fragment ions enabled determination of the role of the hydroxyl and carboxyl hydrogen atoms in the breakup. Specifically, we observe a strong preference for the hydroxyl (OD) group to remain intact in a $${\mathrm{HCOOD}}^{2+}{\rightarrow}{\mathrm{OD}}^{+}+{\mathrm{HCO}}^{+}$$ fragmentation, which is an order of magnitude more likely than $${\mathrm{OH}}^{+}+{\mathrm{DCO}}^{+}$$. An even larger preference for breaking the H-C bond over the O-H bond is observed in the $${\mathrm{H}}^{+}+{\mathrm{DCO}}_{2}^{+}$$ and $${\mathrm{D}}^{+}+{\mathrm{HCO}}_{2}^{+}$$ deprotonation channels. Bond rearrangement, leading to $${\mathrm{H}}_{2}^{+}$$ or $${\mathrm{H}}_{2}{\mathrm{O}}^{+}$$ formation, exhibits no isotopic preference. The kinetic-energy-release distributions of the $${\mathrm{OH}}^{+}+{\mathrm{DCO}}^{+}$$ and $${\mathrm{O}}^{+}+{\mathrm{H}}_{2}{\mathrm{CO}}^{+}$$ breakup channels suggest that more than one process contributes to these final products, although further theoretical work is needed to identify the specific paths.

Research Organization:
Kansas State Univ., Manhattan, KS (United States); Univ. of Nebraska, Lincoln, NE (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); National Aeronautic and Space Administration (NASA); National Science Foundation (NSF)
Grant/Contract Number:
FG02-86ER13491; SC0019451; SC0020276
OSTI ID:
1979617
Journal Information:
Physical Review A, Journal Name: Physical Review A Journal Issue: 5 Vol. 105; ISSN 2469-9926
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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