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光谱学(英语:Spectroscopy)是利用物质发射、吸收或散射、声或粒子的现象,来研究物质或能量的方法。又称谱学,且因研究对象不同,而有不同名称,例如:能谱学、波谱学、频谱学、质谱学(mass spectroscopy/spectrometry)、介电谱学(dielectric spectroscopy)。

sRGB rendering of the spectrum of visible light
颜色 频率 波长
紫色 668–789THz 380–450nm
蓝色 631–668THz 450–475nm
青色 606–630THz 476–495nm
绿色 526–606THz 495–570nm
黄色 508–526THz 570–590nm
橙色 484–508THz 590–620nm
红色 400–484THz 620–750nm






  • 电磁波的吸收与放出(electromagnetic spectroscopy)
  • 巨观摆动的振幅(acoustic spectroscopy)
  • 粒子的动能(electron energy loss spectroscopy)
  • 粒子的荷质比(mass spectrometry)
  • 原子、分子的作用截面积(cross section)

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