Electric dipole moment and polarizability of the 1749 Å, 1B2 excited state of formaldehyde

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Abstract
The medium resolution modulated electric field (electrochromism) spectrum of the 1749 Å band of formaldehyde in the gas phase has been obtained. This differential absorption results from changes in transition probability and transition energy in the presence of a strong electric field and is related to, among other excited state properties, the square of the dipole moment change. The data, after analysis, yield the dipole moment change upon excitation to be 2.66±0.14 D. This change is thought to reduce the dipole moment to near zero in this excited state. In addition, the excited state polarizability is estimated to be 6±3×10−23 cm3 in the state under consideration. These changes coupled with previously reported experimental and theoretical results support the assignment of this transition as the 3s (a1) ←n (b2), B2←A1 molecular Rydberg. Finally, the data suggest that in this energy region there is a state of the same symmetry lying nearby.

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