Abstract

Fourier transform infrared attenuated total reflectance and Fourier transform Raman spectra of the series of aqueous alkali metal oxalates-lithium oxalate (Li2 C2 O4 ), sodium oxalate (Na2 C2 O4 ), potassium oxalate (K2 C2 O4 ), rubidium oxalate (Rb2 C2 O4 ), and cesium oxalate (Cs2 C2 O4 )-are presented for the first time. Fourier transform Raman spectra of the solid oxalates are also presented for the first time. The solid and aqueous oxalate ions are assumed to possess D2h and D2d symmetry, respectively, and the assignment of fundamental vibrational modes is made accordingly. The effect of increasing alkali metal ion concentration on the aqueous spectra of these oxalates is also reported. Spectral changes are explained in terms of the ability of the respective alkali metal cations to interact with the oxalate anion in solution. It is proposed that these differences arise because the alkali metal cations associate with the aqueous oxalate anions to varying degrees, depending upon the nature of the cation. The extent of the binding is found to decrease down the alkali metal series (Li > Na > K > Rb > Cs). Similar results obtained for the tetramethylammonium cation [(CH3)4 N+] suggest that it is a softer cation than cesium.

Spectra of alkali metal vapor and noble gas flashlamps

W. F. Hug, C. M. Hains, and C. J. Marlett
J. Opt. Soc. Am. 68(1) 62-67 (1978)

Intense red emission of mixed-alkali rare-earth free germanate glass-ceramics with Mn ions

Anastasiia Babkina, Damir Valiev, Ekaterina Kulpina, Aleksandra Pavliuk, Ksenia Zyryanova, Alina Monogarova, Alexander Ignatiev, Natalia Kuzmenko, Evgeny Zhizhin, and Aleksandra Koroleva
Opt. Mater. Express 12(5) 2072-2086 (2022)

Precision measurements of optically thick alkali metal number density within a hybrid alkali metal cell

Wei Quan, Kesheng Shen, Yueyang Zhai, Xulin Wang, Liwei Jiang, Wenfeng Fan, Feng Liu, Jie Qin, and Shuangai Wan
Appl. Opt. 57(20) 5714-5719 (2018)

Lattice Vibrational Spectra and Physical Characteristics of Metals with Cubic Structure

J. N. Plendl, P. J. Gielisse, H. S. Plendl, R. A. Kromhout, and L. C. Mansur
Appl. Opt. 10(6) 1444-1450 (1971)

The Time Intervals between the Appearance of Spectral Lines in the Spectra of Alkali and Alkaline–Earth Metals

Gordon L. Locher
J. Opt. Soc. Am. 17(2) 91-101 (1928)