The absorption spectra of the electronic S₁←S₀ transition of glyoxal molecules (C₂{H}₂O₂) embedded in He droplets ( ≈5500atoms) show well-resolved vibronic bands with a width <0.5cm^-1. The phonon wings at higher frequencies have distinct gaps amounting to ΔE0ex0ex=0ex0ex8.1K followed by a small maximum at 14.8 K. The phonon wing shape agrees with a theoretical simulation based on the dispersion curve of elementary excitations in bulk He II, providing the first evidence for superfluidity in the finite-sized He droplets.
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Hartmann et al. (1996) studied this question.
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