LASER SPECTROSCOPY OF HfO: LINKAGE OF THE TRIPLET STATE MANIFOLDS
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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 (0,0) band of the $b^{3}\Pi_{1} - X^{1}\Sigma^{+}$ electronic transition of HfO at a resolution of $0.03 cm^{-1}$. $Previously^{1}$, this transition has been assigned as a $B^{1}\Pi - X^{1}\Sigma^{+}$ electronic transition. The principal constants (in $cm^{-1}$) obtained from recent and previous $analyses^{1,2}$ are: $\begin{array}{lccl}State&Configuration&T_{0}&B_{0}\\ {[}31.4{]}^{3}\Phi_{4}&5d6p&z+22 655.82&0.3719\\ {[}31.4{]}^{3}\Phi_{3}&5d6p&31 392.17&0.3699\\ {[}31.4{]}^{3}\Phi_{1}&5d6p&29 208.32&0.3696\\ G^{1}\Sigma^{+}&5g6s&30 032.706(8)&0.369 070(3)\\ F^{1}\Sigma^{+}(^{3}\Pi_{0+})&6s69(?)&27 351.136(8)&0.364 688(3)\\ E^{1}\Pi (c^{3}\Sigma^{+}_{1})&5d6s&25 176.878(7)&0.367 694(3)e\\ &&&0.368 294(4)f\\ D^{1}\Pi&5d6s&23 503.280(5)&0.368 191(3)e\\ &&&0.367 460(3)f\\ X^{1}\Sigma^{+}&62^{2}&0.0&0.385 644 05(2)\\ a^{3}\Delta_{3}&5d6s&z&0.378 644(7)\\ a^{3}\Delta_{2}&5d6s&10 152.303(12)&0.377 957(13)\\ a^{3}\Delta_{1}&5d6s&9 525.377(9)&0.377 284(9)\\ b^{3}\Pi_{2}&5d6s&z+7928.878&0.377 841(7)\\ b^{3}\Pi_{1}&5d6s&17 528.168(7)&0.377 105(9)e\\ &&&0.376 591(9)f\\ b^{3}\Pi_{0}&5d6s&16 882.564(9)&0.377 188(9)\\ b^{3}\Pi_{0+}&5d6s&16 586.955(9)&0.377 080(9)\end{array}$ Ligand field theory (LFT) calculations were used to suggest electronic configurations for the excited states of HfO. New electronic assignments based on LFT predictions for the F and E states are indicated in parentheses. Work supported by AFOSR under grants F19628-90-C-025 and F49620-92-J-0215.
Description
1. G. Edvinsson and Ch. Nylen, Phys. Scr. 3, 261 (1971). 2. R.S. Ram and P.F. Bernath, J. Mol. Spectrosc, 169, 268-285 (1995).
Author Institution: Emory University, Atlanta, GA 30322
Author Institution: Emory University, Atlanta, GA 30322