The kinetic energy of PAH dication and trication dissociation determined by recoil-frame covariance map imaging

• We investigated the dissociation of dications and trications of three polycyclic aromatic hydrocarbons (PAHs), fluorene, phenanthrene, and pyrene. PAHs are a family of molecules ubiquitous in space and involved in much of the chemistry of the interstellar medium. In our experiments, ions are formed by interaction with 30.3 nm extreme ultraviolet (XUV) photons, and their velocity map images are recorded using a PImMS2 multi-mass imaging sensor. Application of recoil-frame covariance analysis allows the total kinetic energy release (TKER) associated with multiple fragmentation channels to be determined to high precision, ranging 1.94-2.60 eV and 2.95-5.29 eV for the dications and trications, respectively. Experimental measurements are supported by Born-Oppenheimer molecular dynamics (BOMD) simulations.

Ämnesord

NATURVETENSKAP  -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)

NATURVETENSKAP  -- Kemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences (hsv//eng)

NATURVETENSKAP  -- Fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Nyckelord

Kinetic energy

Kinetics

Molecular dynamics

Polycyclic aromatic hydrocarbons

Covariance analysis

Dications

Extreme Ultraviolet

Fluorenes

Imaging sensors

Interstellar medias

Kinetic energy release

Map image

Total kinetic energy

Velocity maps

Dissociation

ionization mass-spectra

multiply-charged ions

electron

photoelectron

spectroscopy

separation

design

Chemistry

Physics

Publikations- och innehållstyp

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