text: In 1956, he returned to Vienna (chair ad personam). At an important lecture during the World Energy Conference he refused to speak on nuclear energy because of his scepticism about it and gave a philosophical lecture instead. During this period, Schrödinger turned from mainstream quantum mechanics' definition of wave–particle duality and promoted the wave idea alone, causing much controversy.
  Tuberculosis and death
  Schrödinger suffered from tuberculosis and several times in the 1920s stayed at a sanatorium in Arosa in Switzerland. It was there that he formulated his wave equation. On 4 January 1961, Schrödinger died of tuberculosis, aged 73, in Vienna. He left Anny a widow, and was buried in Alpbach, Austria, in a Catholic cemetery. Although he was not Catholic, the priest in charge of the cemetery permitted the burial after learning Schrödinger was a member of the Pontifical Academy of Sciences.
  Personal life
  On April 6, 1920, Schrödinger married Annemarie (Anny) Bertel.
  When he migrated to Ireland in 1938, he obtained visas for himself, his wife and also another woman, Hilde March. March was the wife of an Austrian colleague and Schrödinger had fathered a daughter with her in 1934. Schrödinger wrote to the Taoiseach, Éamon de Valera personally, so as to obtain a visa for March. In October 1939 the ménage à trois duly took up residence in Dublin. His wife, Anny (born 3 December 1896), died on 3 October 1965.
  One of Schrödinger's grandchildren, Terry Rudolph, has followed in his footsteps as a quantum physicist, and teaches at Imperial College London.