Balmer series
plural of triple witching hour
(physics) The set of spectral lines of the hydrogen atom that correspond to transitions involving a principal quantum number n=2
plural of company front
A mild speech disorder characterised by a changed accent or intonation
実験室で、放電管の中の水素に現れる主量子数n=2への遷移に対応するスペクトル線（バルマー系列）の明るい線を観測した。
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