LASER SPECTROSCOPY OF NiO: ROTATIONAL ANALYSIS OF THE SYSTEM IV IN THE 5170 - 5500 {AA} REGION
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Date
1984
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Ohio State University
Abstract
Laser-induced fluorescence of NiO formed by the reaction of sputtered Ni atoms from a hollow cathode source with oxygen or ozone was studied. Some of the bands belonging to the Rosen's System $IV^{1}$ were vibrationally and rotationally analyzed. A new vibrational assignment is proposed. The rotational structure of the strongest band at 5176.5 {\AA} resembles $^{1}\Pi-^{1}\Pi$ or $\Omega^{\prime}=1$ to $\Omega^{\prime \prime}=1$ transition. Interesting features include a rotational perturbation in the excited state and extremely strong $\Omega$-doubling in the lower state. This suggests the presence of nearly degenerate $\Omega=0$ electronic state which could be another component of a $a^{3}\Sigma^{-}$ state in Hund's coupling case c. Preliminary rotational analysis of the 5176.5 {\AA} band gives $r^{\prime} = 1.73$ {\AA} and $r^{\prime \prime}_{v} = 1.62$ {\AA} for the equilibrium distances in the upper and lower electronic states.
Description
$^{1}$ B. Rosen, Nature, Lond., 156, 570 (1945).
Author Institution: Quantum Institute and the Department of Chemistry, University of California
Author Institution: Quantum Institute and the Department of Chemistry, University of California