Microwave Optical Double Resonance Spectroscopy of Metal Oxides
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Abstract
Abstract Continuous wave lasers have been employed in gas phase microwave optical double resonance (MODR) experiments. MODR spectroscopy combines the high resolution of microwave spectroscopy with the high sensitivity to transient molecules of optical spectroscopy. Detectability of MODR effects under weak (linear) and strong (nonlinear) optical pumping conditions is discussed. Experiments are described in which the 496.5 nm line of an Ar ion laser and a tunable, cw dye laser are used to observe fourteen microwave rotational transitions in the X 1 Σ (ν = 0,1) and A 1 Σ (ν = 0‐5) states of 138 Ba 16 O and one transition in the A 1 Σ (ν = 1) state of 137 Ba 16 O. Partially deperturbed rotational constants for BaO A 1 Σ are B (ν) = 0.25832(2)‐0.001070(5) (ν + 1/2) cm −1 . A description is given of the cw dye laser and of the procedure for tuning the laser to coincide with any desired rotational line of the BaO A 1 Σ‐X 1 Σ transition. A wide range of metal oxides, halides and hydrides have been produced under conditions suitable for MODR spectroscopy.
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