UV photoprocessing of CO2 ice: a complete quantification of photochemistry and photon-induced desorption processes

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Volume 584 (December 2015)

A&A, 584 (2015) A14

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Table 2

Values used in Eq. (A.2) to convert integrated QMS signals to column densities of desorbed molecules.

Factor	¹³CO₂	CO	O₂

σ⁺ (mol) (Å²)^a	3.521^b	2.516	2.441
I_F(z)	1^c	1^c	1^c
F_F(m)^d	0.794^b	0.949	0.898
(A mbar^-1Å^-2)^e	4.62 × 10¹⁴	1.03 × 10¹⁵	8.41 × 10¹⁴

Notes.

^(a)

Extracted from the online database of the National Institute of Standard and Technologies (NIST).

^(b)

We have used the value corresponding to ¹²CO₂ as an approximation. This introduces an uncertainty of about 2% in the case of the fragmentation factor, according to previous measurements.

^(c)

A value of 1 has been taken, assuming that no double ionization of the molecules takes place.

^(d)

Extracted from the mass spectra library of the QMS software.

^(e)

This work (see Sect. A.2).

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