Optical spectroscopy of CrO and electronic states of the Cr group metal monoxides

doi:10.1088/1674-1056/acb763

Abstract All of the experimentally known electronic states of the Cr group metal monoxides (CrO, MoO, and WO) have been presented in the paper. The optical spectra of the CrO molecule have been investigated in the gas phase through a combination of the laser-induced fluorescence (LIF) excitation and single-vibronic-level (SVL) emission spectroscopy in the supersonic expansion. The rotational constants of the vibronic electronic states, including ${\rm X}\,{}^{5}\Pi_{-1}$ ($v'' = 0$-3), ${\rm B}\,{}^{5}\Pi _{-1}$ ($v^\prime =0$-10), and ${\rm B}\,{}^{5}\Pi_{1}$ ($v^\prime = 1$, 5), and the vibrational constants of the spin-orbit components ${\rm X}\,{}^{5}\Pi _{-1,0,1}$ have been obtained. The molecular constants of the MoO and WO molecules have been summarized by reviewing the previous spectroscopic studies, and a comprehensive energy level diagram of the Cr group metal monoxides has been constructed. By comparing the electronic configurations, bond lengths, and vibrational frequencies of all the transition metal monoxides in the ground electronic state, the significance of the relativistic effect in the bonding of the 5d transition metal monoxides has been discussed. The related spectroscopic data of the CrO molecule are available at https://doi.org/10.57760/sciencedb.j00113.00085.

Keywords: laser-induced fluorescence (LIF) transition metal monoxide electronic state molecular constant relativistic effect

Received: 09 November 2022
Revised: 29 January 2023
Accepted manuscript online: 31 January 2023

PACS:	33.20.Kf	(Visible spectra)
	33.20.Vq	(Vibration-rotation analysis)
	33.15.Mt	(Rotation, vibration, and vibration-rotation constants)
	36.20.Kd	(Electronic structure and spectra)

Fund: Project supported by the National Key R&D Program of China (Grant No. 2022YFA1602500), the National Natural Science Foundation of China (Grant No. 12027809), and Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB21030900).

Corresponding Authors: Jie Yang
E-mail: jie.yang@impcas.ac.cn

Cite this article:

Lei Zhang(张磊), Yao Yu(于尧), Xinwen Ma(马新文), and Jie Yang(杨杰) Optical spectroscopy of CrO and electronic states of the Cr group metal monoxides 2023 Chin. Phys. B 32 053301

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Optical spectroscopy of CrO and electronic states of the Cr group metal monoxides

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