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Table 4

Features detected after ion irradiation of CO and CO:N2 icy samples and their identification in the range 2000 − 650 cm-1.

CO CO:N2 = 8:1 CO:N2 = 1:1 CO:N2 = 1:8 Assignment
(cm-1) (cm-1) (cm-1) (cm-1)

1999 1998 ?
1990 1990 1988 1987 C2O
1984 1984 1982 1980 ?
1950 1950 C6
1937 1936 1934 OCN
1924* ?
1918 1919 C4O
1915 1915 C3O
1889 1890 1891 1890 C8O, C7?
1888 1888 1889 C2N?
1884 NCO
1875 1875 1875 NO
1869 1870 ?
1864 1865 ?
1859 1860 1860 1861 HCO?
1818 1818 C5O
1705* 1698 ?
1657 N3
1655 ?
1653 1653 ?
1615 1616 1616 NO2
1563 1563 C3O2
1479 1479 1478 ?
1300 ?
1303 1303 1303 ?
1291 1291 1291 N2O?
1274 1275 1276 NCO?
1266 1266 1266 1268 ?
1264 ?
1148 1149 ?
1146 1145 ?
1097 1098 ?
1093 ?
1092 1091 1091 1091 ?
1079 1080 1079 C2O
1042 1042 1042 1043 O3
659 659 661 662 C5O2

Notes. 

(*)

This band was present in the IR spectra only at higher doses.

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