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Table 1

Positions and integrated band strengths of H2CO and the HCO isotopologue at 13 K.

Position (cm-1) A (cm molec-1)a Modea Labela
pure in water
12C 13C 12C 13C

2991 2957 2993 2959 3.2 × 10-18 ν2+ν6
2885 2860 2883 2860 4.7 × 10-18 νCH2as ν 5
2821 2819 2826 2817 1.3 × 10-17 νCH2s ν 1
2724 2717 2723 2715 / ν2+ν4b
1716 1682 1715 1678 1.6 × 10-17 νCO ν 2
1492 1492 1496 1494 5.1 × 10-18 δCH2 ν 3
1244 1235 1247 1237 1.5 × 10-18 ρCH2 ν 6
1178 1167 1178 1167 7.2 × 10-19 ωCH ν 4

Notes. ν: stretching; δ: bending; ρ: rocking; ω: wagging.

(b)

tentative.

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