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Table 2

List of (control) experiments and integrated baseline-corrected QMS signals for m/z = 20 and 22, i.e. HO and DO, and the calculated HO abundance in ML.

Nr. Experimental parameters Integrated QMS signal
T Time CO2 flux 18O2 flux 18O flux H2/D2 flux 70–105 125–175 HO
(K) (min) (mol cm-2 s-1) (mol cm-2 s-1) (at cm-2 s-1) (mol cm-2 s-1) (K) (K) (ML)
1a 14 75 1.6 × 1014 1.7 × 1012 2 × 1011 H2 2.2 × 1014 2.1 × 10-9 2.1 × 10-9 0.26
2b 14 75 1.6 × 1014 1.7 × 1012 2 × 1011 – – 9.6 × 10-10 6.4 × 10-10 0.10
3b 14 75 – – – H2 2.2 × 1014 2.2 × 10-10 4.2 × 10-10 0.03
4b 14 75 – – – – – ~0 1.3 × 10-10 ~0
5a 14 300 1.6 × 1014 1.7 × 1012 2 × 1011 H2 2.2 × 1014 –c –c ~1d
6a 17 75 1.6 × 1014 1.7 × 1012 2 × 1011 H2 2.2 × 1014 1.2 × 10-9 1.3 × 10-9 0.15
7a 35 75 1.6 × 1014 1.7 × 1012 2 × 1011 H2 2.2 × 1014 1.7 × 10-9 8.4 × 10-10 0.16
8a 50 75 1.6 × 1014 1.7 × 1012 2 × 1011 H2 2.2 × 1014 1.6 × 10-9 4.2 × 10-10 0.12
9a 14 75 1.6 × 1014 1.7 × 1012 2 × 1011 D2 1.2 × 1014 – e 5.0 × 10-11 f –
1.8 × 10-9 g 9.4 × 10-10 g 0.17
10a 14 75 1.6 × 1014 1.7 × 1012 2 × 1011 D2 2.2 × 1014 – e 1.5 × 10-10 f –
2.7 × 10-9 g 9.4 × 10-10 g 0.22

Notes. The baseline-corrected QMS signals are integrated over two different temperature ranges covering the CO2 and the H2O desorption peaks, 70–105 K and 125–175 K.

(a)

Experiment.

(b)

Control experiment.

(c)

Different ramp rate.

(d)

From RAIRS.

(e)

Overlaps with doubly ionized CO2.

(f)

m/z = 22.

(g)

m/z = 20.

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