## FOURIER TRANSFORM EMISSION SPECTRUM OF FeO NEAR $1 \mu m$

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### Date

1984

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Ohio State University

### Abstract

The near infrared $(4 000 - 14 000 cm^{-1})$ spectrum of FeO has been recorded with the 1-meter FT spectrometer at Kitt Peak National Observatory. Like that of the orange system of FeO, the spectrum is very complex and highly perturbed. It consists of two systems: ${^{5}}\Phi-X^{5} \Delta$ and ${^{5}}\Pi-X^{5} \Delta$. All three states exhibit good case (a) behaviour and have electronic configurations (in single configuration approximation): $X {^{5}}\Delta_{i} 3d \delta^{3} 3d\pi^{2} 4s \sigma^{1}$ and ${^{5}}\Phi_{i},{^{5}}\Pi_{i} 3d \delta^{3} 3d\pi^{2} 3d\sigma^{1} 4s \sigma^{1}(0 2p \pi)^{3}$. The ${^{5}}\Phi$ and ${^{5}}\Pi$ states lie only about $250 cm^{-1}$ apart and therefore overlap each other extensively. These states are perturbed by at least three different electronic states, one of which is a $\Sigma$ state. The most likely candidates for the other perturbing states are ${^{3}}\Pi, {^{7}}\Pi, {^{3}}\Phi$, and ${^{7}}\Phi$, all derived form the same electronic configuration as the ${^{5}}\Phi$ and ${^{5}}\Pi$ states. We have recently found that the $X^{5}\Pi$ state is also perturbed, probably by a ${^{7}}\Sigma^{+}$ state $(3d \delta^{2} 3d \pi^{2} 3d \sigma^{1} 4s\sigma^{1})$. In total, we have evidence for at least seven electronic states lying below $11 000 cm^{-1}$ and possibly as many as nine.

### Description

Author Institution: Dept. of Chemistry, University of British Columbia; Harvard College Observatory, Cambridge; Dept. of Chemistry, McGill University