Isotope effects on the absorption spectrum of Li in solid hydrogens under high pressures

The isotope effects on the absorption spectrum of Li in solid hydrogens at T = 5 K and different pressures are extensively studied. At a lower pressur e, the difference in Li atomic absorption spectra between the Li/D-2 and th e Li/H-2 systems is significant, while becomes less remarkable with the inc rease in pressure. The zero-point motion from H-2 molecules influences the Li absorption spectrum in both a direct and an indirect way. Although the d irect and indirect effects on the absorption spectrum from the quantum moti on cancel partly, eventually the indirect effect dominates the variations o f the Li absorption spectrum. (C) 2001 Elsevier Science B.V. All rights res erved.