Open Access

Table A.1

Mid-infrared vibrational modes of amorphous methanol ice (CH3OH) and its isotopologues between 2300 and 800 cm–1 at 10 K.

Mode/cm–1 (μm) CH3OH CH3OD CH2DOH CHD2OH CD3OH CD3OD
CD3 asym. stretch 2233 (4.48) 2244 (4.46)
CD3 asym. stretch 2215 (4.51) 2216 (4.51)
CD2 asym. stretch 2222 (4.50)
CD2 asym. stretch 2180 (4.59)
C−D stretch 2242 (4.46)
C−D stretch 2179 (4.59)
C−D stretch 2146 (4.66)
CD2 sym. stretch 2126 (4.70)
CD3 sym. stretch 2071 (4.83) 2071 (4.83)
CH3 deformation 1461 (6.84)
CH3 asym. bend 1470 (6.80)
CH3 sym. bend 1445 (6.92)
CH2 bend 1464 (6.83)
C−H bend 1329 (7.52)
C−H bend 1301 (7.69)
O−H/O−D bend 1461 (6.84) 942 (10.62) 1464 (6.83) 1424 (7.02) 1398 (7.15) 1123 (8.90)
CH3 rock 1234 (8.10)
CH3 rock 1158 (8.64) 1161 (8.61)
CH3 rock 1129 (8.86) 1123 (8.90)
CD3 sym. bend 1122 (8.91) 1123 (8.90)
CH2 wag 1326 (7.54)
CH2 twist 1293 (7.73)
CH2 rock 1108 (9.03)
CD2 bend 1088 (9.19)
CH2 rock 1087 (9.20)
CD3 asym. bend 1067 (9.37) 1062 (9.42)
C−O stretch 1031 (9.70) 1031 (9.70) 1036 (9.65) 1031 (9.70) 981 (10.19) 975 (10.26)
CD2 wag 949 (10.54)
OCD bend 919 (10.88)
CD2 twist 895 (11.17)
CD3 rock 898 (11.14) 900(11.11)
CD3 rock 832 (12.02)

Notes. Band positions are given in cm–1, with corresponding wavelengths in μm shown in parentheses. “—” indicates that the mode is not observed or not applicable for that isotopologue. Assignments are tentative.

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