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Isotopically selective infrared multiphoton dissociation of 2,3-dihydropyran

2,3-ジヒドロピランの同位体選択的赤外多光子解離

横山 淳; 勝又 啓一*; 大場 弘則  ; 赤木 浩; 佐伯 盛久; 横山 啓一  

Yokoyama, Atsushi; Katsumata, Keiichi*; Oba, Hironori; Akagi, Hiroshi; Saeki, Morihisa; Yokoyama, Keiichi

2,3-ジヒドロピランの赤外多光子解離を利用した酸素18の同位体分離について検討した。赤外光として炭酸ガスレーザー光を用い、レーザー振動数,レーザーフルエンス、及び試料圧を変えて分離係数を測定した結果、分離係数として最大751の値を得、天然で0.205%の酸素18を60%まで濃縮することに成功した。また、一般の化合物の場合と異なり、試料圧が高くなるにつれて分離係数が増加する現象が起こることを見いだし、分子衝突による振動エネルギー緩和を取り入れた速度方程式によるシミュレーション結果をもとに議論した。

Oxygen isotope separation has been examined by using an infrared multiphoton dissociation of 2,3-dihydropyran. Enrichment factor has been measured by the CO$$_{2}$$ laser irradiation of the samples as a function of laser frequency, laser fluence, and sample pressure. Maximum enrichment factor of 751 has been obtained, and $$^{18}$$O, natural abundance of which is 0.205 %, was enriched to 60 %. Moreover, it was found that the enrichment factor increases with increasing the sample pressure, which was different from the infrared multiphoton dissociation of usual molecules. This phenomenon was discussed on the basis of a simulation by a rate equation model including a collisional vibrational relaxation.

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パーセンタイル:15.77

分野:Chemistry, Physical

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