The Microwave Spectra and r0, rs, and rm Structures of Ethylene Oxide

摘要: The rotational spectra of ten isotopic species ethylene oxide, 12C2H416O, 12C13CH416O, 12C2H418O, 12C2H3D16O, cis- and trans-12C2H2D216O, 12C13CH2D216O, 12C2H2D218O were observed. A least-squares fit including centrifugal distortion effect to the first order was made derive effective values A′, B′, C′, τ′aaaa, τ′bbbb, τ′cccc, τ′aabb parameters their correlation factors; τ′bbcc τ′aacc found be insignificant. constants used determine r0, rs, rm structures. structural derived as:& r_0(CC)=1.470±0.003, r_s(CC)=1.466±0.002, r_m(CC)=1.462±0.003,& r_0(CH)=1.085±0.004, r_s(CH)=1.085±0.001, r_m(CH)= 1.086±0.004,& r_0(CO)=1.434±0.002, r_s(CO)=1.431±0.001, r_m(CO)=1.428±0.002,& ∠_0HCH=116.28±0.69, ∠_SHGH=116.61±0.09, ∠_mHGH=116.92±0.69, θ0=22.34±0.46, θs=21.99±0.11, θm=21.63±0.48 in units degrees; θ represents angle H2C plane CC bond. indicated error limits are 2.5 times variances.