Physical Review LettersDirect Spectroscopic Evidence of Bound States of (H2)2 Complexes at Low TemperaturesAtomu Watanabe, H. L. WelshPublished Dec 28, 1964• 96 citationsPublisherAbstractReceived 16 October 1964DOI:https://doi.org/10.1103/PhysRevLett.13.810©1964 American Physical SocietyDOI10.1103/physrevlett.13.810