Analysis of the 0-0, 1-0, and 2-0 Bands of the [18.09]4 (5Δ4)-X4 (5Δ4) and [18.46]3 (5Δ3)-X3 (5Δ 3) transitions of ruthenium monoxide (RuO)

Laser Induced Fluorescence (LIF) has been used to study the spectroscopy of ruthenium monoxide (RuO) in the UNB laser-ablation molecular-jet apparatus. High-resolution spectra of the 0-0, 1-0 and 2-0 bands of the [18.09] 4 - X-4 and [18.46]3 - X3 transitions have been obtained with a linewidth (FWHM) of similar to 100 MHz. Rotational structure of six individual isotopologues (RuO)-Ru-96, (RuO)-Ru-99, (RuO)-Ru-100, (RuO)-Ru-101, (RuO)-Ru-102 and (RuO)-Ru-104 was well resolved and used to examine the rotational and vibrational isotope effects. In addition, hyperfine structure due to the nuclear spin (I = 5/2) of Ru-99 and 101Ru has been resolved and used as an aid in establishing the electron configurations of the electronic states. The relative hyperfine widths in the omega = 4 and 3 states are shown to be consistent with their assignment as components of 5A states.

Automated summary

Laser Induced Fluorescence (LIF) was used to study the spectroscopy of ruthenium monoxide (RuO) in the UNB laser-ablation molecular-jet apparatus. High-resolution spectra of the 0-0, 1-0, and 2-0 bands of the [18.09] 4 - X-4 and [18.46]3 - X3 transitions were obtained, revealing rotational and vibrational isotope effects. The hyperfine structure due to nuclear spin of Ru-99 and 101Ru was resolved, aiding in establishing the electron configurations of the electronic states. The observed hyperfine widths in ω = 4 and 3 states are consistent with their assignment as components of 5A states.