Direct spectroscopic observation of elementary excitations in superfluid He droplets

被引：229

作者：

Hartmann, M ^{[1
]}

Mielke, F ^{[1
]}

Toennies, JP ^{[1
]}

Vilesov, AF ^{[1
]}

Benedek, G ^{[1
]}

机构：

[1] UNIV MILAN,DIPARTIMENTO FIS,IST NAZL FIS MAT,I-20133 MILAN,ITALY

来源：

PHYSICAL REVIEW LETTERS | 1996年 / 76卷 / 24期

关键词：

D O I：

10.1103/PhysRevLett.76.4560

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The absorption spectra of the electronic S-1 <-- S-0 transition of glyoxal molecules (C2H2O2) embedded in He droplets (approximate to 5500 atoms) show well-resolved vibronic bands with a width < 0.5 cm(-1). The phonon wings at higher frequencies have distinct gaps amounting to Delta E = 8.1 K 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.

引用

页码：4560 / 4563

页数：4

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