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Title:Study Of Limg And Limg+ Using Laser Induced Fluorescence And Two-photon Ionization
Author(s):Persinger, Thomas D.
Contributor(s):Heaven, Michael; Han, Jiande
Subject(s):Electronic structure, potential energy surfaces
Abstract:Heterodimers consisting of an alkaline and alkaline-earth metal, such as LiMg have the potential for being laser cooled to ultra-cold temperatures. The X1$^{2}\Sigma^{+}$ ground state of LiMg allows manipulation by both magnetic and electric fields, and its non-zero dipole moment offers the possibility that it could be used in quantum computing devices. Current experimental data on LiMg and LiMg$^{+}$ are sparse$^{1,2}$. In the present study we used resonance enhanced two-photon ionization spectroscopy (RE2PI) and laser induced fluorescence (LIF) to record rotationally resolved spectra of the X1$^{2}\Sigma^{+}$, 2$^{2}\Pi$ and 3$^{2}\Sigma^{+}$ states. Near-UV spectra previously assigned as E-X and F-X transitions were also reevaluated. Vibrationally resolved spectra of the X1$^{2}\Sigma^{+}$ and 1$^{2}\Pi$ state were observed using dispersed LIF. Pulsed-field ionization - zero kinetic energy photoelectron spectroscopy (PFI-ZEKE) was used to determine the ionization energy (IE) and the low-energy states of LiMg$^{+}$. An IE of 4.7695(4) eV for LiMg was found, and vibrationally resolved spectra yielded molecular constants for LiMg$^{+}$ that were consistent with a substantial strengthening of the bond upon ionization. 1. Berry, K.R. and Duncan, M.A., (1997) Photoionization spectroscopy of LiMg. Chem. Phys. Lett., 279, 44-49 2. Pichler, G., Lyyra, A.M., Kleiber, P.D., Stwalley, W.C., Hammer, R., Sando, K.M., and Michels, H.H., (1989) Laser-induced chemiluminescence of the lithium-magnesium (LiMg) excimer. Chem. Phys. Lett., 156, 467-71
Issue Date:2021-06-24
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper / Presentation
Date Available in IDEALS:2021-09-24

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