N'afọ 1896, obere oge tupu ịkwaga Leiden gaa Amsterdam, ọ tụrụ nkewa nke ahịrị spectral site na mpaghara magnetik siri ike, nchọpụta a maara ugbu a dị ka mmetụta Zeeman, nke ọ meriri na 1902 Nobel Prize na Physics. Nnyocha a gụnyere nyocha nke mmetụta nke mpaghara magnetik na isi iyi ọkụ. Ọ chọpụtara na a na-ekewa ahịrị spectral n'ime ọtụtụ ihe dị na ọnụnọ nke mpaghara magnetik. Lorentz buru ụzọ nụ banyere nchọpụta Zeeman na Satọde 31 Ọktoba 1896 na nzukọ nke Royal Netherlands Academy of Arts and Sciences na Amsterdam, ebe Kamerlingh Onnes kọọrọ nsonaazụ ndị a. Na Mọnde na-esote, Lorentz Zeeman kpọrọ ya n'ọfịs ya ma kọwaara ya nchọpụta ya, dabere na Lorentz's theory of electromagnetic radiation. Ajụjụ: Ebee ka ọ si Amsterdam?
Leiden