A spectroscopic study of the rhodium monoboride molecule

Abstract

A laser-induced fluorescence spectrum of rhodium monoboride (Rh¹⁰B and Rh¹¹B) has been recorded under jet-cooled conditions between 425 and 505 nm at rotational resolution. Two electronic transitions have been identified: a ¹Σ–X¹Σ system with (0,0) band at 19 985 cm⁻¹ and a ¹Π–X¹Σ system with (0,0) band at 20 110 cm⁻¹. Both excited states are less strongly bound than the ground state. For the [20.0] ¹Σ state of Rh¹⁰B/Rh¹¹B, ω_e ≈ 682/651 cm⁻¹ and B ₀ = 0.533/0.484 cm⁻¹; for the [20.1]¹Π state, ΔG _1/2 = 739/710 cm⁻¹ and B ₀ = 0.558/0.521 cm⁻¹. Dispersed fluorescence experiments indicate the presence of low-lying electronic levels at 360, 9440 and 10 228 cm⁻¹.

Keywords:

• Rhodium monoboride
• Electronic spectrum
• Electronic structure

Acknowledgements

Funding for the project was provided by the Natural Sciences and Engineering Research Council of Canada and the University of Victoria. Valuable assistance was rendered by Drs Roy H. Jensen, Jens Lassen and Runhua Li.

Notes

†It is a pleasure to recognize the seminal contributions to Molecular Physics by Christian Jungen, a friend of many years.

Additional information

Notes on contributors

W. J. Balfour†

†It is a pleasure to recognize the seminal contributions to Molecular Physics by Christian Jungen, a friend of many years.