Abstract
Stark-shifted microwave transitions in the ground and ν 2 vibrational states of H 2CO were observed by means of CO laser-microwave double-resonance with intense electric field. High sensitivity and precision were attained by the use of multireflection absorption cell, optical-flat Stark plates, and microwave frequency stabilization. Dipole moments determined from some individual rotational transitions in the ground and ν 2 vibrational states are, in Debye, with uncertainties in parentheses, Transition G.S. ν 2 δμ 1 10 ← 1 11 2.3315 (1) 2.3472 (1) 0.0157 (1) 2 11 ← 2 12 2.3313 (1) 2.3471 (1) 0.0158 (1) 3 12 ← 3 13 2.3313 (1) 2.3470 (1) 0.0157 (1) 8 26 ← 8 27 2.3311 (1) 2.3466 (1) 0.0155 (1) 9 27 ← 9 28 — 2.3466 (1) — The excitation of the ν 2 vibration increases the dipole moment by δμ = μ( ν 2) - μ(G.S.) = 0.0156(1) D. A slight but significant variation of dipole moment depending on the rotational state was observed. The rotational dependence is useful in determining the signs of the dipole moment first derivatives, of which the absolute values are obtained from the infrared band intensity studies.
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