X-ray photodesorption of complex organic molecules in protoplanetary disks - II. Formic acid, HCOOH

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Table 2

X-ray photodesorption yields (in 10⁻³ molecules photon⁻¹) of H¹²COOH and photo-products from initially deposited mixed ¹³CO:H¹²COOH (10:1) and H₂O:H¹²COOH (10:1) ices.

Species	¹³CO:H¹²COOH−10:1	H₂O:H¹²COOH−10:1
H₂O	8.6 ± 1.7	12 ± 2
¹²CO	90 ± 5	24 ± 4
¹²CO₂	37 ± 3	22 ± 2
H¹²CO		15 ± 4
$H_{2}^{12} C O$ $\[\mathrm{H}_{2}^{12} \mathrm{CO}\]$		1.1 ± 0.3
O₂	2.3 ± 0.6
H¹²COOH	1.6 ± 1.0	<1

Notes. Yields were derived from an irradiation at 15 K, at 560 eV and for a photon fluence received by the ice (before the measurements) between ~4 × 10¹⁵ and ~3 × 10¹⁶ photons cm⁻².

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