Electric Dipole Moment of the Lowest Singlet π* State of Propynal

Abstract

Stark‐effect measurements of the 0–0 band of the 3820‐Å transition (¹A″←¹A′) have been made. Analysis of the ^pP subbands with K″ = 9, 10, and 11 yields a value μ_a′ = 0.7±0.2 D. The other component of the dipole moment, μ_b′, of the upper state is not determined. The relatively complex spectrum produced in the Stark effect is readily simulated by computed spectra. The techniques used appear to be applicable to complex spectra.