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Table 4

Values used in Eq. (2) to convert integrated QMS signals for the mass fragments into column densities of desorbing molecules.

Factor H2CO C2H6 H2O CH4 CO
σ+(mol) (Å2)a 4.140 6.422 2.275 3.524 2.516
fragment H2CO+ C2H H2O+ CH CO+
m / z 30 30 18 15 28
IF(z) 1b 1b 1b 1b 1b
FF(m) 0.319a 0.121c 0.806c 0.406c 0.949c
(A mbar-1Å-2)d 1.77 × 1015 1.77 × 1015 3.86 × 1015 4.69 × 1015 2.02 × 1015
(A mbar-1Å-2)e 9.30 × 1014 9.30 × 1014 1.69 × 1015 1.97 × 1015 1.03 × 1015
(A mbar-1Å-2)f 1.29 × 1015 1.29 × 1015 2.50 × 1015 2.94 × 1015 1.44 × 1015
Srel(mol)g 0.982 0.982 1.092 1.111 1.000

Notes.

(a)

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

(b)

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

(c)

extracted from the mass spectral library of the QMS software;

(d)

calculated for our QMS and valid for experiments 1, 2, 6, 9, and 10 (see Sect. 2);

(e)

for experiments 3 and 7 (see Sect. 2);

(f)

for experiments 4, 5, and 8 (see Sect. 2);

(g)

calculated with Eq. (4).

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