for his investigations on the properties of matter at low temperatures which led, inter alia, to the production of liquid helium
in recognition of his work on the linkage of atoms in molecules by which he has thrown new light on earlier investigations and opened up new fields of research especially in inorganic chemistry
because of his profoundly sensitive, fresh and beautiful verse, by which, with consummate skill, he has made his poetic thought, expressed in his own English words, a part of the literature of the West
for his unparalleled contribution to the organization of peaceful internationalism