LASER SPECTROSCOPY OF TiO: ACCURATE TERM ENERGIES FOR THE SINGLET STATE MANIFOLD
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Date
1995
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Ohio State University
Abstract
The wavelength-resolved fluorescence excitation technique has been used to record the (2,0) band of the $C^{3}\Delta_{3}-a^{1}\Delta$ transition and the (2,3) and (2,4) bands of the $C^{3}\Delta_{3}-X^{3}\Delta_{3}$ electronic transition of TiO at a resolution of $0.03 cm^{-1}$. These data were combined with previous high-resolution analysis of the ground $X^{3}\Delta state^{1}$ to obtain accurate term energies for the singlet states manifold of TiO. The term energy for the first excited $a^{1}\Delta$ state above the (nonexistent) J=0 level of the $X^{3}\Delta_{1}$ ground state is: $T_{0}(a^{1}\Delta) = 3444.367\pm 0.020 cm^{-1}$. This value differs significantly from the previously derived $value^{2}$ of $T_{0}(a^{1}\Delta) = 3448.33\pm 0.04 cm^{-1}$. Energy values are lesser by about $4 cm^{-1}$ than currently accepted $values^{3}$ for the singlet states of TiO. The principal constants (in $cm^{-1}$) obtained from recent and previous analyses are: $\begin{array}{lccll}State&v&T_{v}&B_{v}&D_{v} 10^{7}\\ e^{1}\Sigma^{+}&0&29 960.592(14)&0.488 25(3)&5.10(12)\\ f^{1}\Delta&0&22 513.355(4)&0.502 363(6)&6.671(30)\\ c^{1}\Phi&0&21 284.957(4)&0.521 366(15)&3.16(13)\\ b^{1}\Pi&0&14 717.185(3)&0.511 995(6)e&6.409(25)\\ &&&0.512 154(6)f&6.425(26)\\ C^{3}\Delta_{2}&2&21 176.502(3)&0.489 124(10)&6.913\\ d^{1}\Sigma^{+}&0&5 663.147(4)&0.547 702(7)&6.3813(26)\\ a^{1}\Delta&0&3 444.367(1)&0.536 287(4)&6.107(29) \end{array}$ Work supported by AFOSR under grants F19628-90-C-025 and F49620-92-J-0215.
Description
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Author Institution: Emory University, Atlanta, GA 30322
Author Institution: Emory University, Atlanta, GA 30322