Elsevier

Chemical Physics Letters

Volume 202, Issues 3–4, 22 January 1993, Pages 209-215
Chemical Physics Letters

First observation of an excited state of Li2H

https://doi.org/10.1016/0009-2614(93)85267-RGet rights and content

Abstract

We report the first experimental optical spectra of Li2H. Vibrational structure of the Li2H B state has been obtained by two-photon ionization spectroscopy, as well as high-resolution rotational spectra. Simulations of the rotational structure in the first vibrational band allowed us to determine the geometry of Li2H in the ground and excited B states: LiLi = 2.52 Å, LiH = 1.715 Å in the ground A1 state and LiLi = 3.24 Å, LiH = 2.29 Å in the B1 state. The geometry found for the ground state is in excellent agreement with several ab initio calculations. The ionic character of both states is discussed.

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