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| Direct Measurement Method of Planck Constant Based on Photon Energy Measurement |
| LI Yu-fen,HE Sui-rong,WEI Lian-fu |
| School of Information Science and Technology, Southwest Jiaotong University, Chengdu, Sichuan 610031, China |
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Abstract Planck’s constant is the smallest acting quantum in physics. It is a mark to distinguish classical physics from quantum phenomena. Therefore, the accurate measurement of such a basic physical constant is very important, not only to understand the origin of the material world, the experimental observation of various quantum effects, but also for the establishment of the physical measurement benchmark of mass units. The precise measurements of Planck constant have demonstrated for more than 120 years, by various indirect and direct methods. Although its exact value was given in 2019, the accuracy of its measurement value is still not enough, specifically compared to that of the time and frequency measurements. As a new development of the indirect measurement of Plancks constant by the traditional photoelectric effect method, a direct measurement method of Plancks constant is proposed by using the photon-induced ionization of electrons on liquid helium. The saturated photocurrent platforms could be measured by using the photon number resolution detectors for the different intensity lasers. The feasibility of the method could be achieved by using the existing micro/nano technique to fabricate the devices, which will be measured in a low temperature weak signal detection system.
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Received: 15 March 2022
Published: 08 April 2022
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2022, Vol. 43 
