= Karl Friedrich Bonhoeffer
{c}
{title2=1899–1957}
= K. F. Bonhoeffer
{c}
{synonym}
<Karl Friedrich Bonhoeffer> and <Paul Harteck> prepared <parahydrogen> at low <temperatures> in 1929. The work made the distinction between <orthohydrogen> and <parahydrogen> experimentally accessible and connected the physical properties of molecular <hydrogen> with its nuclear-spin states.https://www.fhi.mpg.de/history[Institute history: 1929 purification of parahydrogen at low temperatures]{ref}
A <chemist>.<Karl Friedrich Bonhoeffer>[Biography: research and appointments]{ref}
\Image[https://upload.wikimedia.org/wikipedia/commons/0/08/Bonhoeffer%2CKarl_Friedrich_1928_M%C3%BCnchen.jpg]
{title=Portrait of <Karl Friedrich Bonhoeffer>}
{width=240}
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