Photoionization quantum yields of polycyclic aromatic hydrocarbons.

Details Photoionization quantum yields of polycyclic aromatic hydrocarbons. Photoionization quantum yields of polycyclic aromatic hydrocarbons.

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...314.1003j&link_type=abstract

Astronomy and Astrophysics, v.314, p.1003-1009

Astronomy and Astrophysics

Astrophysics

18

Molecular Processes, Ism: Molecules (Pahs), Ultraviolet: Ism

Scientific paper

The gas-phase photoionization yield curves were measured for 6 PAHs: benzene, naphthalene, azulene, anthracene, phenanthrene and benz[a]anthracene, over the photon energy range 5-25eV, and the corresponding photoionization quantum yields γ(λ) were derived as a function of wavelength. The results are used to propose "rules of thumb" for determining the value of γ(λ) of PAHs at any photon energy above the ionization threshold. Effects of molecular size on γ(λ) and on the ease of photoelectron ejection are discussed in the context of determination of γ(λ) for the full range of PAHs expected in the ISM. These data are required for modelling PAH destruction and ionization rates in circumstellar and interstellar media and also for understanding the energy budget of the diffuse interstellar medium.

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