2022/07/08 by Masatomi Iizawa, Susumu Kuma, Naoki Kimura +4 · 1 voice
Chemistry · Engineering · Physics and Astronomy · #Atomic and Molecular Physics #Ion-surface interactions and analysis #Mass Spectrometry Techniques and Applications
paper · doi:10.7566/jpsj.91.084302
openalex publication_date 2022/07/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/13
We performed laser-induced electron detachment spectroscopy of \(C2 - \) ions, produced by a cesium-sputter ion source and stored in the electrostatic ion storage ring RICE, to study highly excited states and their temporal evolution. From the observed peaks originating in the doublet–doublet transition X \(2Σg + \)–B \(2Σu + \), we determined the spectroscopic constants for B \(2Σu + \) v′ = 5–8 by applying the Δv = −1 transition. Moreover, we found that the overall spectra showed a striking difference from previously reported spectroscopic measurements. The majority of the observed peaks could not be ascribed to doublet–doublet transitions. We studied the lifetimes of these unassigned peaks by varying the ion storage time prior to pulsed laser irradiation and discovered shorter- and longer-lived components of 1.5–3 ms and more than 10 ms, respectively. The former lifetime is in good agreement with the autodetachment component observed without laser irradiation, suggesting a possible detachment channel from a metastable quartet state.