Newly observed low-lying Ω = 1 state of PbO

Katsunari Enomoto; Taichi Tojo; Kaori Kobayashi; Susumu Kuma; Ayami Hiramoto; Yuki Miyamoto; Masaaki Baba

doi:10.1063/5.0196184

Newly observed low-lying Ω = 1 state of PbO

J Chem Phys. 2024 Apr 7;160(13):134306. doi: 10.1063/5.0196184.

Authors

Katsunari Enomoto¹, Taichi Tojo¹, Kaori Kobayashi¹, Susumu Kuma², Ayami Hiramoto³, Yuki Miyamoto³, Masaaki Baba^{4

5}

Affiliations

¹ Department of Physics, Faculty of Science, University of Toyama, Toyama 930-8555, Japan.
² Atomic, Molecular and Optical Physics Laboratory, RIKEN, Wako, Saitama 351-0198, Japan.
³ Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan.
⁴ Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
⁵ Molecular Photoscience Research Center, Kobe University, Kobe 657-8501, Japan.

PMID: 38568945
DOI: 10.1063/5.0196184

Abstract

High-resolution spectroscopy of lead monoxide was performed in a range of 22 400-25 300 cm-1. A new Ω = 1 state located between the a1 and A0+ states was observed, and it is labeled c1. Spectroscopic constants, including the hyperfine interaction coefficient, were determined for the a1 and c1 states. The vibrational levels of these two electronic states are located closely to each other, and the interaction between them causes gradual exchange of electronic state properties in our observation wave number range. Our observation poses a question for the band assignment for the b0- state, which has some resemblance with this c1 state.