Table 1. Relative Energies (ΔE, in kcal/mol) and Dipole Moment (μ, in Debye) of the Conformers of Each Structural Isomer of C₂H₆O₂.

isomer	ΔEa	μb	detected in the ISM
1 (1,1-Ethanediol)
1–1	0.0	0.3	no
1–2	2.2	2.5	no
1–3	2.4	2.3	no
1–4	2.7	2.8	no
1–5	3.0	2.7	no
2 (Ethylene Glycol)
2–1	11.4	2.5	yes
2–2	11.8	2.5	yes
2–3	12.0	0.2	no
2–4	13.6	0.0	no
2–5	13.7	2.1	no
2–6	13.8	0.0	no
2–7	13.9	2.4	no
2–8	14.0	1.5	no
2–9	14.5	3.2	no
3 (Methoxymethanol)
3–1	15.7	0.3	yes
3–2	17.6	2.5	no
3–3	18.0	2.2	no
4 (Ethyl Hydroperoxide)
4–1	65.1	1.7	no
4–2	65.3	1.6	no
4–3	65.3	1.8	no
5 (Dimethyl Peroxide)
5–1	74.5	0.0	no

^aCCSDT/aug-cc-pVTZ//MP2/aug-cc-pVTZ.

^bMP2/aug-cc-pVTZ.