Solid-state formation of CO2 via the H2CO + O reaction

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Volume 577 (May 2015)

A&A, 577 (2015) A2

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Table 1

Ion count per second of masses 30, 29, 28, and 18 a.m.u. as a function of pumping time of the paraformaldehyede powder held at 62 °C.


Pumping	H₂CO		H₂O	CO	^a	^a
time	Mass 30	Mass 29	Mass 18	Mass 28	^a	^a
(min)	Signal_{(Flag Open−Flag Closed)}^b (cps)				%

0	580	420	920	1300	92	130
10	650	490	520	1100	45	96
25	740	570	150	620	11	47
50	810	680	10	140	1	9
90	810	690	0	150	0	10

Notes. These signals correspond to the detection of H₂CO (mass 30 and 29), CO (mass 28), and H₂O (mass 18). .

^(a)

These values indicate the percentage of H₂O and CO with respect to H₂CO. The values were obtained through the formulae 100*Mass18/(Mass29+Mass30) and 100*Mass28/(Mass29+Mass30) for H₂O and CO, respectively.

^(b)

Difference between the signal recorded with the flag open and with the flag closed

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