dc.creator Cheung, A. S-C. en_US dc.creator Pang, H. F. en_US dc.creator Ng, Y. W. en_US dc.creator Chen, G. en_US dc.date.accessioned 2010-07-12T13:58:52Z dc.date.available 2010-07-12T13:58:52Z dc.date.issued 2010 en_US dc.identifier 2010-WF-02 en_US dc.identifier.uri http://hdl.handle.net/1811/46138 dc.description Author Institution: Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong en_US dc.description.abstract Laser induced fluorescence spectrum of iridium monoboride (IrB) in the spectral region between 420 and 480nm has been studied. New electronic transition system observed at 435nm has been assigned to be the [22.3] $^3$\Phi_{3}$- X$^3$\Delta_{3}$?ª transition. Isotopic relationship confirmed the vibrational numbering. Molecular constants obtained will be reported. Resolved fluorescence spectrum of the [22.3] $^3$\Phi_{3}$- X$^3$\Delta_{3}$ transition showed that the $\Delta$G$_{1/2}$ of the X$^3$$\Delta_{3} state is 917 cm^{-1}. Theoretical study using complete active space self-consistent field (CASSCF) calculations followed by MS-CASPT2 including scalar relativistic effect has been performed to the IrB molecule; molecular bond length, electronic configurations and relative energies of the ground and low-lying electronic states have been obtained. Our computed results indicated that the ground state of IrB is an inverted X^3$$\Delta$ state with a bond length, r$_0$, equal to1.767 $\AA$, which is in very good agreement with our experimental determination earlier. The electronic configuration giving rises to the ground state is 1$\sigma$$^2 2\sigma$$^2$1$\pi$$^4 3\sigma$$^1$1$\delta$$^3. Our calculations also showed that the earlier observed [16.5] ^3$$\Pi$ state and the [22.3] $^3$$\Phi state in this work are the (2)^3$$\Pi$ and the (2)$^3$$\Phi$ states, respectively. The molecular properties obtained in our calculations agree reasonably well with those determined. Financial support from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. HKU 701008P) is gratefully acknowledged en_US dc.language.iso en en_US dc.publisher Ohio State University en_US dc.title ELECTRONIC TRANSITIONS OF IRIDIUM MONOBORIDE en_US dc.type Article en_US dc.type Image en_US dc.type Presentation en_US
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