On the invitation of Arnold Sommerfeld, he worked at the University of Munich, and on the creation by the Rockefeller Foundation of the Institute of Physics and Chemistry (Madrid), in 1930 he was named head of the Spectroscopy Section.
Por invitación de Arnold Sommerfeld traballou na Universidade de Múnic e, trala creación do Instituto de Física e Química de Madrid pola Fundación Rockefeller, en 1930 foi nomeado xefe da sección de espectroscopia.