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The absorption spectra of the electronic S₁S₀ transition of glyoxal molecules (C₂H₂O₂) 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 0ex{0ex}=0ex{0ex}8. 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.
Hartmann et al. (Mon,) studied this question.
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