Radiative cooling rates of substituted PAH ions

• The unimolecular dissociation and infrared radiative cooling rates of cationic 1-hydroxypyrene (OHPyr+, C16H10O+) and 1-bromopyrene (BrPyr+, C16H9Br+) are measured using a cryogenic electrostatic ion beam storage ring. A novel numerical approach is developed to analyze the time dependence of the dissociation rate and to determine the absolute scaling of the radiative cooling rate coefficient. The model results show that radiative cooling competes with dissociation below the critical total vibrational energies Ec = 5.39(1) eV for OHPyr+ and 5.90(1) eV for BrPyr+. These critical energies and implications for radiative cooling dynamics are important for astrochemical models concerned with energy dissipation and molecular lifecycles. The methods presented extend the utility of storage ring experiments on astrophysically relevant ions. 

Ämnesord

NATURVETENSKAP  -- Fysik (hsv//swe)

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

Nyckelord

Energy dissipation

Ion beams

Life cycle

Storage rings

1-Hydroxypyrene

Cationics

Cooling rates

Dissociation rates

Infrared radiative cooling

Numerical approaches

Radiative cooling

Scalings

Time dependence

Unimolecular dissociation

Ions

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)