Complex sentence: The notion of isomer appears also in other fields (chemistry, meteorology): therefore in the first papers devoted to this effect1,2 the name "nuclear isomeric shift on spectral lines" was used.
Split into simpler sentences: The notion of isomer appears also in other fields such as chemistry and meteorology. Therefore in the first papers devoted to this effect 1,2 the name "nuclear isomeric shift on spectral lines" was used.