论文标题
首次观察水蒸气中电肢红外线过渡
First observation of electric-quadrupole infrared transitions in water vapour
论文作者
论文摘要
红外辐射的分子吸收通常是由于RO振动电偶极转变引起的。电肢体过渡可能仍会发生，但通常比电偶极转变弱一百万倍，使他们的观察力极具挑战性。在多原子或极性氨基分子中，从未观察到RO振动四极转变。在这里，我们报告了水蒸气中四极转变的首次直接检测。检测到的四极线的强度在很大程度上高于光谱数据库的标准偶极强度截断，因此对于准确的大气和天文遥感非常重要。
Molecular absorption of infrared radiation is generally due to ro-vibrational electric-dipole transitions. Electric-quadrupole transitions may still occur, but they are typically a million times weaker than electric-dipole transitions, rendering their observation extremely challenging. In polyatomic or polar diatomic molecules, ro-vibrational quadrupole transitions have never been observed. Here, we report the first direct detection of quadrupole transitions in water vapor. The detected quadrupole lines have intensity largely above the standard dipole intensity cut-off of spectroscopic databases and thus are important for accurate atmospheric and astronomical remote sensing.
