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    化學所在一氧化碳真空紫外光解離的同位素效應研究中取得新進展
    2019-08-07 | 編輯: | 【 】【打印】【關閉

    一氧化碳分子(CO)在星際空間中的豐度僅次于氫氣(H2)分子,排在第二位。CO吸收宇宙空間中的真空紫外輻射以后會解離生成C原子和O原子;碎片原子會進一步和H2分子反應生成碳氫化合物和水,而這些次生分子是組成生命的基本物質。另一方面,CO的光吸收和光解離還被認為是造成太陽系中CO同位素異常分布的直接原因,從分子層面理解這一現象形成的機制對于研究太陽系的演化歷史以及行星的形成機制具有重要的意義。目前,大量的光譜學研究已經證明稀有同位素取代(13C17O18O)會顯著影響CO分子吸收譜線的位置和強度以及光解離效率等;而對于同位素取代會對解離產物的量子態布居造成什么樣的影響還不清楚,而這是理解CO同位素在太陽系中異常分布的最重要參數之一。

    在國家自然科學基金委和北京分子科學國家研究中心的支持下,化學所分子反應動力學實驗室朱起鶴院士、高蕻研究員和程敏副研究員等自主設計并搭建了一套高分辨時間切片離子速度成像裝置,其能量分辨率達到了國際上同類儀器的領先水平Rev. Sci. Instrum.2018, 89, 013101;同時,他們基于四波混頻原理搭建了一套高分辨(線寬~0.3 cm-1)可調頻的真空紫外激光光源(65-200 nm)。利用這些自主搭建的儀器裝置,他們對小分子在真空紫外波段的光解離動力學展開了系統深入的研究(Phys. Chem. Chem. Phys.2019, 21, 14376)。

    最近,他們在CO真空紫外光解離的同位素效應研究方面取得了新的進展。他們用自主設計和搭建的真空紫外光源將12C16O13C16O分別激發至相同的高激發量子態,并用切片離子速度成像裝置精確測量解離碎片的平動能,得到了其解離到每個通道的分支比。CO解離有三個可能的通道,分別是C(3P)+O(3P)C(1D)+O(3P)C(3P)+O(1D),其中3P表示CO的基態,1D表示激發態。實驗結果表明,同位素取代會強烈影響CO解離產生的基態和激發態碎片原子之間的相對比例(如圖所示)。在宇宙空間的低溫環境中,基態的CO原子幾乎不能和H2發生化學反應;而激發態的原子和H2的反應是無勢壘的,因此可以在很低的溫度下以非常快的速度發生,并生成碳氫化合物和水。該結果可能會對現有的天體化學模型產生重要的影響。相關研究成果發表在近期的《自然通訊》上。( Nat. Commun.201910, 3175)本文的第一作者是化學所分子反應動力學實驗室在讀博士生蔣攀,通訊作者是高蕻研究員和程敏副研究員。

    圖 CO光解離通道分支比的同位素效應

     

     

    分子反應動力學實驗室

    201987

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