Lecture15

Interatomic forces in liquid weak acts like a boson

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Unformatted text preview: ! ! 2 " N % TE = $ ' km # 2.612V & The number of parUcles n the ground state orbital is: N g 1 Ng / N 0.8 2/3 = N ! N e = N (1 ! (T / TE )3/2 ) (Ng + Ne ) / N Ne / N 0.6 0.4 0.2 0 0 0.2 0.4 0.6 0.8 1 T/Te 9 4He Bose ­Einstein condensaUon in •  4He = 2 protons, 2 neutrons, 2 electrons (i.e. it’s a boson) TE = 2! ! " N % $ ' km # 2.612V & 2 2/3 4He T = 3.1 K m=6.6x10 ­27 kg E V=27.6 cm3/mol Specific heat of 4He: TransiUon at 2.17 K, called the “lambda point” below which Ng is substanUal. Inter ­atomic forces in liquid weak, acts like a boson gas with TE close to 3.1 K. Buckingham and Fairbank, 1961 Macroscopic number of par/cles in the same quantum state! T ­TE (K) T ­TE (mK) T ­TE (μK) 10 Peculiar properUes of...
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This document was uploaded on 02/04/2014.

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