Vibrational dependence of the dipole moment in the A 3Π1 state of ICI

The Stark effect is measured for the A3Π1←1Σ+ band system. The dipole moment of the A state as a function of vibrational level is measured to be, in Debye, ν′μ′ν′μ′ν′μ′ν′μ′72.00(± 0.15)111.85(0.10)141.75(0.05)211.15(0.15)91.95(0.05)121.80(0.10)171.50(0.15)250.6 (0.15)101.90(0.10)131.60(0.15)181.25(0.10)270.6 (0.15)The sign of the A state moments appears to be opposite to that of the X state.