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Table 7

Values used in Eq. (2) to convert integrated QMS signals in experiments 7−10 (see Table 6) into column densities of desorbed molecules.

Factor HCO 13CO
σ+(mol) (Å2)a 4.140 2.516
Fragment H13CO+ 13CO+
m / z 30 29
IF(z) 1b 1b
FF(m) 0.549c 0.949d
(A mbar-1Å-2)e 9.30 × 1014 9.77 × 1014
(A mbar-1Å-2)f 1.29 × 1015 1.36 × 1015
(A mbar-1Å-2)g 1.77 × 1015 1.89 × 1015
Srel(mol)h 0.973 0.991

Notes.

(a)

We used the values corresponding to HCO and 12CO, extracted from the online NIST database, as an approximation;

(b)

a value of 1 was adopted, assuming that no double ionization of the molecules takes place;

(c)

we used the value corresponding to the fragment H12CO+, extracted from the online NIST database, as an approximation;

(d)

we used the value corresponding to the molecular ion 12CO+, extracted from the mass spectra library of the QMS software, as an approximation;

(e)

calculated for our QMS and valid for experiment 7 (see Sect. 2);

(f)

for experiment 8 (see Sect. 2);

(g)

for experiment 9 and 10 (see Sect. 2);

(h)

calculated with Eq. (4).

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