Table 1 Possible ions corresponding to most abundant signals shown in Fig. 7

5

HHe ⁺

8

He\(_{2}^{+}\)

9

HHe\(_{2}^{+}\)

12

He\(_{3}^{+}\)

C ⁺

14

N ⁺

CH\(_{2}^{+}\)

15

NH ⁺

CH\(_{3}^{+}\)

16

He\(_{4}^{+}\)

NH\(_{2}^{+}\)

O ⁺

CH\(_{4}^{+}\)

17

HHe\(_{4}^{+}\)

NH\(_{3}^{+}\)

OH ⁺

18

NH\(_{4}^{+}\)

H₂O ⁺

19

H₃O ⁺

27

C₂H\(_{3}^{+}\), HCN ⁺

28

N\(_{2}^{+}\)

C₂H\(_{4}^{+}\), CO ⁺

29

HN\(_{2}^{+}\)

C₂H\(_{5}^{+}\)

30

H₂N\(_{2}^{+}\)

NO ⁺

C₂H\(_{6}^{+}\), COH\(_{2}^{+}\)

31

HNO ⁺

32

O\(_{2}^{+}\)

N ⁺(H₂O)

34

H₂O\(_{2}^{+}\)

37

H ⁺(H₂O)₂

42

N\(_{3}^{+}\)

44

N₂O ⁺

CO\(_{2}^{+}\)

46

NO\(_{2}^{+}\),N\(_{2}^{+}\)(H₂O)

48

O\(_{3}^{+}\)

NO ⁺(H₂O)

55

H ⁺(H₂O)₃

64

N\(_{2}^{+}\)(H₂O)₂

66

NO ⁺(H₂O)₂

73

H ⁺(H₂O)₄