UV photoprocessing of CO2 ice: a complete quantification of photochemistry and photon-induced desorption processes

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Table 3

Evolution of the ice and gas column densities of CO₂ and its photoproducts during UV irradiation of a pure CO₂ ice analog.

Fluence	N_ice(CO₂)^a	N_ice(CO)	N_gas(CO)	N_total(CO)	N_ice(CO₃)	N_ice(O₂)^b	N_gas(O₂)	N_ice(O₃)
(photons cm^-2)	(10¹⁵ molecules cm^-2)

0.00	200.3	0.0	0.0	0.0	0.0	0.0	0.0	0.0
6.0 × 10¹⁶	159.7	27.9	0.2	28.1	12.1	0.0	0.0	5.8
3.6 × 10¹⁷	110.3	62.0	2.6	64.6	7.4	28.9	0.2	11.6
7.2 × 10¹⁷	99.0	67.6	6.6	74.2	5.3	37.5	0.5	12.3
1.4 × 10¹⁸	87.9	58.9	15.7	74.7	3.7	53.8	1.3	10.7
2.9 × 10¹⁸	67.7	47.1	32.3	79.4	2.8	75.6	2.5	7.8

Notes.

^(a)

We have assume that N_gas(CO₂) = 0 as a first approximation (see text).

^(b)

Estimated upper limit (see text).

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