Question

When 4He is cooled below 2.17 K it becomes a "superlluid" with unique properties such as the viscosity approaching zero. One way to learn about the superlluid environment is to measure the rotational-vibrational spectrum of molecules embedded in the fluid. For example, the spectrum of OCS in a low-temperature JHe droplet has been reported {Journal of Chemical Physics. 112, 2000, 4485). For OC}:S the authors measured a rotational constant of 0.203 cm*1 and found that the intensity of the J= 0-1 transition was 1.35 times greater than that of the J= 1-2 transition. Using this information, provide a rough estimate of the temperature of the lHe droplet.

Answer 1