Low-temperature caloric behavior of a free sodium nanoparticle

被引：22
作者：
Hock, C. [1 ,2 ]
Schmidt, M. [3 ]
von Issendorff, B. [1 ]
机构：
[1] Univ Freiburg, Fak Phys, D-79104 Freiburg, Germany
[2] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA
[3] Univ Paris 11, CNRS, Aime Cotton Lab, F-91405 Orsay, France
来源：
PHYSICAL REVIEW B | 2011年 / 84卷 / 11期
关键词：
DEGREES-K; HEAT; SPECTROSCOPY; PARTICLES; CLUSTERS; PALLADIUM; METAL; SIZE; GAS;
D O I：
10.1103/PhysRevB.84.113401
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report on accurate temperature control of size-selected sodium cluster cations by buffer gas thermalization in a temperature variable dodecapole radio frequency trap, which permits measurements of the cluster caloric behavior down to a temperature of T = 6 K. For Na-139(+), a fit to the caloric curve obtained yields a Debye temperature of 163.5 +/- 10 K, which compares well to the value of bulk sodium (158 K), and indicates that the overall vibrational density of states of the cluster is similar to that of the bulk. An estimate based on this finding shows that at T = 6 K the majority of the clusters are in their vibrational ground state.
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页数：4
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