Odd-parity autoionizing levels of uranium observed by two-color two-step photoionization optogalvanic spectroscopy. (11th August 2021)

• Record Type: Journal Article
• Authors: Miyabe, M; Sato, Y; Wakaida, I; Terabayashi, R; Sonnenschein, V; Tomita, H; Zhao, Y; Sakamoto, T
• Is Part Of: Journal of physics. Volume 54:Number 14(2021)
• Publication Date: 2021-08-11
• Subjects: optogalvanic spectroscopy -- uranium -- autoionizing level; Atoms -- Periodicals; Molecules -- Periodicals; Optics -- Periodicals; Nuclear physics -- Periodicals; 539.6
• DOI: 10.1088/1361-6455/abf89f
• Languages: English
• ISSNs: 0953-4075

Abstract

Abstract: Two-color two-step photoionization optogalvanic spectroscopy was performed using high-repetition-rate titanium sapphire lasers and a uranium hollow cathode lamp to find the two-step resonance ionization schemes of uranium. Many ionization transitions were observed by exciting uranium atoms in a ground state into five, even parity, excited levels with the first-step laser and by scanning the second-step laser wavelengths. By blocking the first-step laser, single-color, two-photon ionization transitions were also identified. From these results, we have found more than 50 odd-parity autoionizing levels of uranium in the energy, ranging from the ionization potential (49958.4 cm −1 ) to 51 150 cm −1 . The determined energy levels are within ∼±1 cm −1 of previously reported values.