Abstract: | The pure rotational spectrum of CH2F2 was recorded in the 20–100 cm−1 spectral range and analyzed to obtain rotation and centrifugal distortion constants. Analysis of the data yielded rotation constants: A = 1.6392173 ± 0.0000015, B = 0.3537342 ± 0.00000033, C = 0.3085387 ± 0.00000027, τaaaa = −(7.64 ± 0.46) × 10−5, τbbbb = −(2.076 ± 0.016) × 10−6, τcccc = −(9.29 ± 0.12) × 10−7, T1 = (4.89 ± 0.20) × 10−6, and T2 = −(1.281 ± 0.016) × 10−6cm−1. |