Towards an electronic kilogram: an improved measurement of the Planck constant and electron mass

被引：107

作者：

Steiner, RL ^{[1
]}

Williams, ER ^{[1
]}

Newell, DB ^{[1
]}

Liu, RM ^{[1
]}

机构：

[1] NIST, Gaithersburg, MD 20899 USA

来源：

METROLOGIA | 2005年 / 42卷 / 05期

关键词：

D O I：

10.1088/0026-1394/42/5/014

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The electronic kilogram project of NIST has improved the watt balance method to obtain a new determination of the Planck constant h by measuring the ratio of the SI unit of power W to the electrical realization unit W-90, based on the conventional values for the Josephson constant KJ-90 and von Klitzing constant RK-90. The value h = 6.62606901(34) x 10(-34) J s verifies the NIST result from 1998 with a lower combined relative standard uncertainty of 52 nW/W. A value for the electron mass m(e) = 9.10938214(47) x 10(-31) kg can also be obtained from this result. With uncertainties approaching the limit of those commercially applicable to mass calibrations at the level of 1 kg, an electronically-derived standard for the mass unit kilogram is closer to fruition.

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收藏

页码：431 / 441

页数：11

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