Hydrogenation reactions in interstellar CO ice analogues - A combined experimental/theoretical approach

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Table 1:

The production rate and yield of H₂CO and the yield of CH₃OH.
T	Rate(H₂CO)_t=0^a	Yield (H₂CO)^b	Yield (CH₃OH)^b	Steady state	Calc. pen. column^c
(K)	(10^-3 molec./H atom)	(10¹⁵ molec. cm^-2)	(10¹⁵ molec. cm^-2)		(10¹⁵ molec. cm^-2)
12.0	9.0	1.2	0.8	yes	2.0
13.5	7.3	1.0	1.4	yes	2.4
15.0	3.2	0.9	1.6	yes	2.5
16.5	1.1	0.8	0.6	no
18.0	1.0	0.5	0.2	no
20.0	0.9	0.4	0.1	no

^a Rate at t=0 determined from slope.
^b Yield after three hours of H-atom exposure which corresponds to a fluence of $5.4\times 10^{17}$ H atoms cm^-2. The steady state yield is not reached for all temperatures (fifth column).
^c Penetration column obtained from Cols. 3, 4, and 6.

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