When 4 He is cooled below 2.17 K it becomes a “superfluid” with unique propertie

Question

When 4 He is cooled below 2.17 K it becomes a “superfluid” with unique properties such as the viscosity approaching zero. One way to learn about the superfluid environment is to measure the rotational-vibrational spectrum of molecules embedded in the fluid. For example, the spectrum of OCS in a low-temperature 4 He droplet has been reported (Journal of Chemical Physics, 112, 2000, 4485). For OC32S the authors measured a rotational constant of 0.203 cm-1 and found that the intensity of the J=061 transition was 1.35 times greater than that of the J=162 transition. Using this information, provide a rough estimate of the temperature of the 4 He droplet.

Explanation / Answer

When 4 He is cooled below 2.17 K it becomes a “superfluid” with unique propertie

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