TPD spectra (4 K min-1) obtained after VUV photolysis of an ice mixture containing H2O:H2CO=5:1. The photolysis is performed at 13 K for 23 h. Only the relevant m/z values are shown. Detected species are indicated by the letters a-g at their desorption temperature: (a) CH3OH (m/z 32); (b), (c), (d partial co-desorption between HCOOH (m/z 46), H2CO3 (m/z 61), GA (m/z 60), and EG (m/z 62) during water desorption; (e) GA (m/z 60); (f) EG (m/z 62); (g) oligomer of formaldehyde X-(CH2-O)n-Y with n< 5.
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