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Laser Absorption Spectroscopy of LaF+: Ligand Field Assignment of States in the Range 0–4 eV

✍ Scribed by Leonid A. Kaledin; Alexey L. Kaledin; Michael C. Heaven

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
186 KB
Volume
179
Category
Article
ISSN
0022-2852

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✦ Synopsis

The laser absorption spectrum of the LaF / molecular ion has been observed for the first time. Gas-phase LaF was obtained by heating a mixture of La metal and LaF 3 powder to 1900 K. LaF / ions were produced by passing a 25-kHz discharge through the vapor. Under these conditions the tantalum heating tube used to vaporize the sample also acted as a hollow cathode. One hundred thirty-eight lines of the 2 F 2.5 -2 D 1.5 (0,0) band, with J up to 100.5, were recorded. Accurate term values and rotational constants are reported. Ligand field theory models were used to provide configurational assignments for the LaF / electronic states. The symmetry for the ground state of the LaF / molecular ion was assigned as X 2 D.

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