Abstract
The Zeeman effect of several rotational transitions of [1,1-2H2]ethene has been observed in the millimetre wave range using field strengths close to 2·65 T and cell temperatures near - 170 °C. The rotational g values and susceptibility anisotropies fitted to the field splittings were transferred to those of CH2=CH2 leading to gaa = - 0·3954(9), gbb = - 0·1159(3), gcc = 0·0453(2), 2ζ aa - ζ bb - ζ cc = 0·759(21) × 10- 29 erg G- 2, and 2ζ bb - ζ cc - ζ aa = 1·926(45) 10- 29 erg G- 2. These data are combined to yield Qaa = 1·48(10), Qbb = 1·67(19), Qcc = - 3·16(19) for the principal axis electric quadrupole tensor components (all in 10- 26 esu) of ethene. The errors are standard deviations, and do not include contributions possibly arising from zero-point vibrational effects.
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