Photoelectron spectroscopy of the negative ion SeO−

Abstract

We have recorded the photoelectron spectrum of SeO− using a newly constructed negative ion photoelectron spectrometer. The adiabatic electron affinity of SeO is determined to be 1.456±0.020 eV. Values of ν00(a 1Δ–X 3Σ−0+) and ΔG1/2(a 1Δ) are found to be 5530±200 and 916±35 cm−1, respectively, in substantial accord with previous measurements. The negative ion parameters determined in this work are: B″e(SeO−) =0.4246±0.0050 cm−1 which leads to r′e(SeO−)=1.726±0.010 Å, ω″e(SeO−)=730±25 cm−1, ω′e x″e(SeO−)=2±4 cm−1, and D0(SeO−)=3.84±0.09 eV. In addition, the spectroscopic parameters of SeO− are compared with those of the electronically analogous negative ions: O−2, SO−, and S−2.