Photolysis of interstellar ice analogs containing ethanol: A new approach to forming C2H4O2 isomers

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Volume 706 (February 2026)

A&A, 706 (2026) A314

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Table A.1

Vibrational assignments of solid CH₃CH₂OH: Matrix isolation and astrophysical ices

spectral position (cm⁻¹)
Present work	Zasimov ^b	Coussan ^c	Present work	Hudson ^d	Present work
Ethanol/Neon	Ethanol/Neon	Ethanol/Ar	Pure ethanol	Pure ethanol	Ethanol/O₂	Assignment
3678	3679	3661
3655		3656
3529 ^a						OH _str
3444^a			3370	3377	3391
3277 ^a			3272	3298	3282

2990	2995	2995
2986	2986	2985	2971	2972	2977	CH_{3 a - str}

2943	2942	2939	2929	2930	2934	CH_{3 a - str}

2915	2915	2917				CH_{2 a - str}

2903	2903	2900	2895	2897	2901
2897	2897					CH_{2 s-str}
2883 ^a						CH_{2 s-str}
2748 ^a

1493	1493	1487	1487	1487	1490	CH_{2 cis}

1464	1465	1463	1458	1460	1459

1451	1449	1445	1448	1448	1447	CH_{3 a - deform}

1425	1427		1425	1423	1425
1412	1414	1416				CH_{2 wag}

1375	1373	1372	1381	1380	1381	CH_{3 s - deform}
			1329	1326	1329

1301 ^a
1271 ^a	1253		1274	1275	1274	OH_deform
1242	1241	1240	1275	1274		????

1165	1159	1161	1164		1164
			1153		1153	CH_{2 rock}+CH_{3 rock}

1091	1091	1092
1054 ^a			1051	1050	1054	CCO_str+CH_{3 rock}
1028	1028	1025

892	892	889			889
881	890	886		879	881	CCO_str

814	815	812
806 ^a			803	804	805	CH_{2 rock}+CH_{3 rock}

766 ^a			665	657	665
617 ^a
						Torsion ^e
594^a
569 ^a

Notes. ^(a)(CH₃CH₂OH)_x aggregates with x>1 ^(b)Zasimov et al. (2023) ^(c)Coussan et al. (1998) ^(d)Hudson (2017) ^(e)Luna et al. (2018)

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