Computer Science
Scientific paper
Jun 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mss..confewf02c&link_type=abstract
"International Symposium On Molecular Spectroscopy, 65th Meeting, Held 21-25 June, 2010 at Ohio State University. http://molspec
Computer Science
Electronic (Uv/Vis/Nir)
Scientific paper
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] ^3Φ3 - X^3Δ3μ transition. Isotopic relationship confirmed the vibrational numbering. Molecular constants obtained will be reported. Resolved fluorescence spectrum of the [22.3] ^3Φ3 - X^3Δ3 transition showed that the ΔG1/2 of the X^3Δ3 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^3Δ state with a bond length, r_0, equal to1.767 Å, which is in very good agreement with our experimental determination earlier. The electronic configuration giving rises to the ground state is 1σ^2 2σ^21π^4 3σ^11δ^3. Our calculations also showed that the earlier observed [16.5] ^3Π state and the [22.3] ^3Φ state in this work are the (2)^3Π and the (2)^3Φ 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
Chen Gang
Cheung Allan S.-C.
Ng Wai Yin
Pang H. F.
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