Nuclear susceptibility of helium three liquid and gas
Manka, Robert Hall
Rorschach, Harold E., Jr.
Master of Arts
The technique of adiabatic fast passage has been used to measure the relative magnetic susceptibility, X , of He3 and mixtures of He3-He4 with an experimental r.m.s. deviation of ±1%. Two types of measurements were made: (1) Measurement of X versus temperature (from 1.96°X to 0.93°K) of pure He3 liquid, and He3-He4 mixtures containing 35%, 14%, and 5% He3. (2) Measurement of relative X versus density of pure He3 gas at 2.99°K, with density varying from 1.1 x 10-3 to 4.5 x 10-3 moles/cc. Preliminary measurements of X versus density, p , of He3 atoms, for 2 x 10-3 <p< 26 x 10-3 moles/cc. at 1.96°K were made by using liquid He3-He4 mixtures ranging from 5% to 100% He3. The method of relating these individual measurements is explained. The above results are compared to theory and other previous work. Experimental difficulties affecting precision measurements are discussed.