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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >~(18)O-Selective Infrared Multiple Photon Decomposition of Natural and ~(18)O-Enriched Diisopropyl Ethers
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~(18)O-Selective Infrared Multiple Photon Decomposition of Natural and ~(18)O-Enriched Diisopropyl Ethers

机译：天然和〜（18）O富二异丙醚的〜（18）O选择性红外多光子分解

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摘要

~(18)O-Selective infrared multiple photon decomposition of diisopropyl ether has been studied in detail using samples with ~(18)O at oxygen atomic fractions of 0.20% (natural abundance ratio), 4.5%, and 17.3%. The 1022 cm~(-1) band due to the ~(12)C-~(16)O-~(12)C antisymmetric stretching vibration was found to shift toward a lowenergy side by 24 cm~(-1) for ~(12)C-~(18)O-~(12)C. The ~(18)O-selectivities and yields of the main products containing oxygen, acetaldehyde, and 2-propanol were examined as functions of experimental parameters. The irradiation of a few Torr (1 Torr = 1 mmHg = 133.322 Pa) of diisopropyl ether with TEA (transversely excited atmospheric) CO_2 laser lines in the vicinity of 950 cm~(-1) resulted in considerably high enrichment of ~(18)O in the products. The fluence at focus was more or less than 8 J cm~(-2). Acetaldehyde and 2-propanol containing ~(18)O at about 20% were obtained from natural ether, and those containing more than 70% were obtained from 17.3% ~(18)O-enriched ether. The observed results can be explained in term of the mechanism involving radical and molecular decomposition channels.
机译：使用氧原子分数分别为0.20％（自然丰度比），4.5％和17.3％的〜（18）O样品，详细研究了〜（18）O-选择性红外多光子分解二异丙醚的方法。发现由于〜（12）C-〜（16）O-〜（12）C反对称拉伸振动引起的1022 cm〜（-1）波段向〜方向向低能侧偏移了24 cm〜（-1）。 （12）C-〜（18）O-〜（12）C。考察了含氧，乙醛和2-丙醇的主要产物的〜（18）O选择性和收率，作为实验参数的函数。在950 cm〜（-1）附近用TEA（横向激发大气）CO_2激光线照射几托（1 Torr = 1 mmHg = 133.322 Pa）二异丙醚，导致〜（18）的富集度很高产品中的O。聚焦通量大于或小于8 J cm〜（-2）。从天然醚中获得约20％的含〜（18）O的乙醛和2-丙醇，从富含17.3％〜（18）O的醚中获得含70％以上的乙醛和2-丙醇。可以用涉及自由基和分子分解通道的机理来解释观察到的结果。

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