We have measured the pressure broadening and shift of the excitation and emission lines of the 6s² ¹{S}₀→6s6p¹P₁ transition of Ba atoms implanted in liquid and solid helium at 1.5 K. The observed spectra are quantitatively explained within the adiabatic line-broadening theory by assuming a bubble structure of the trapping sites for the Ba atoms. The evolution of the bubble shape and size in the optical excitation-deexcitation cycle is modeled theoretically.
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Kanorsky et al. (1994) studied this question.
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