Phys. Rev. Lett. 76, 4560–4563 (1996)Direct Spectroscopic Observation of Elementary Excitations in Superfluid He DropletsReceived 9 February 1996; published in the issue dated 10 June 1996 The absorption spectra of the electronic S1←S0 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 ΔE = 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. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.76.4560
DOI:
10.1103/PhysRevLett.76.4560
PACS:
67.40.Yv, 33.20.Kf, 67.40.Db
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