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It is shown that the drastic distinction in the rotational structure ofmolecules in the He4 and He3 liquids observed in [1] is due to the differencein the spectral density of excitations regardless of the hydrodynamicproperties. The large width of rotational levels in the He3 is determined byparticle-hole excitations whereas the small density of phonon excitationsresults only in the small broadening of levels in the He4.Comment: RevTex, 4 pages, corrected some typo

physical review letters

Rotational Structure of Molecules in Quantum<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>H</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>4</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow><mml:mi>e</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>H</mml:mi></mml:mrow><mml:…

Rotational Structure of Molecules in QuantumH4eandH