Fluorescence
Rudolf Ludwig Mössbauer (German spelling: Mößbauer; German pronunciation: [ˈʁuːdɔlf ˈmœsˌbaʊ̯ɐ] (listen); 31 January 1929 – 14 September 2011) was a German physicist best known for his 1957 discovery of recoilless nuclear resonance fluorescence for which he was awarded the 1961 Nobel Prize in Physics.