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英语翻译Most gas molecules have fundamental bands of vibrational

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英语翻译
Most gas molecules have fundamental bands of vibrational
transition in the mid-infrared (2–60 lm) region,whereas
overtone and combination bands lie in the near-infrared
(0.75–2 lm) region
大多数气体分子因纯转动跃迁引起的基频吸收带出现在中红外光区(2-60lm),而在近红外光区(0.75-2 lm)则可以观测气体分子倍频及组合谱带的吸收.