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Table 3

Upper limit co-desorption rates (R) for a systematic set of different experiments.

Methanol COa CH4 Ratio Type Heating ramp Tpeak(CO) Rmethanol
(ML) (ML) (ML) (K min−1) (K) (MeOH CO−1)
5.7 137.4 ~1:24 Mixed 1 32.3 ≤ 3.3 × 10−6
2.9 52.2 ~1:18 Mixed 10 33.5 ≤ 2.6 × 10−6
8.7 119.7 ~1:14 Mixed 10 35.1 ≤ 1.1 × 10−6
11.4 123.3 ~1:11 Mixed 10 34.9 ≤ 1.9 × 10−6
24.6 126.9 ~1:5 Mixed 10 35.4 ≤ 7.3 × 10−7
31.2 30.5 ~1:1 Layered 10 32.5 ≤ 3.2 × 10−5
13.1 21.0 ~3:5 Mixed on CO 10 32.8 ≤ 6.8 × 10−6

3.9 31.9 ~1:8 Mixed 10 41.2b ≤ 3.2 × 10−5,b

Notes. (a) Determined by the 13 CO band multiplied by 91 to retrieve the total 12+13C column density; (b) in the experiment making use of methane, Tpeak is given for CH4 and Rmethanol is units of MeOH CH .

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