CO desorption from interstellar icy grains induced by infrared excitation of superhydrogenated polycyclic aromatic hydrocarbons

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Table 3

Desorption amounts and yields for the PHP irradiations of the mixed and layered ices.

Ice	Decrease in column density ∆N_CO (10¹⁵ mol. cm⁻²)	Effective irradiation time (s)	Desorption yield Y_des,inc (10⁻⁶ mol./ inc. photon)	Quantum yield Y_des,abs (10⁻⁴ mol./ abs. photon)
CO:PHP mixed	5 ± 2	13	0.8 ± 0.4	0.3 ± 0.1
CO/PHP layered	16 ± 2	3	7 7 ± 1.2	3.1 ± 0.5

Notes. The effective irradiation times are derived from the fits to the QMS data. Desorption yield errors are derived from the estimated errors on the decrease in column density.

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