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Table 4

Assignments for IR absorption bands in the spectra of hydroxylamine in mixtures with H2O (or D2O) and/or CO at 20 K.

Band assignment NH2OH band position in ice mixtures (cm–1)

NH2OH:H2O(1:10) NH2OH:H2O:CO (1:7:5) NH2OH:D2O:CO (1:6:3)
v (OH) 3698 3638
vasym (NH2) 3323
vsym (NH2) 3272
3204
2v3 3087
v2, v (OH) 2948 2964 2969
2902 2929 2929
v3 + v4 2795 2792
2v6 2678 2680 2688
2458

v3, δ (HNH) 1637 1649 1707, 1620

1544 1544
δ (HNO) 1487 1474 1474

tw (NH2) 1320

w (NH2) 1200 1197 1208
1145

v5, v (NO) 918 923
888
v6, r (NH2) 833

NH3 1118 1085 1080

Notes. Assignments were made based on the previous works of Nightingale & Wagner (1954) and Luckhaus (1997). Also included is the band position for the tentatively detected NH3 product observed in the spectra of the ices. N.B. DB = dangling bonds; asym = asymmetric; sym = symmetric; v = stretching, δ = bending; w = wagging; tw = twisting; r = rocking.

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