Ejection dynamics of hydrogen molecular ions from methanol in intense laser fields
Ejection dynamics of hydrogen molecular ions from methanol in intense laser fields
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DOI：
10.1088/0953-4075/39/13/s24
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发表时间：
2006-07-14
影响因子：
1.6
通讯作者：
Nakano, H.
中科院分区：
文献类型：
--
作者：
Okino, T.;Furukawa, Y.;Nakano, H.
利用符合动量成像方法研究了在强激光场（800nm，60fs，0.2 PW cm⁻²）中甲醇（CH₃OH、CD₃OH和CH₃OD）的两体库仑爆炸过程中氢分子离子的发射。从符合动量图中，确定了氢分子离子的发射过程，CH₃OH₂⁺→Hₘ⁺ + CH₍₃₋ₘ₎OH⁺（m = 2，3），CD₃OH₂⁺→Dₘ⁺ + CH₍₃₋ₘ₎OH⁺（m = 2，3）以及CH₃OD₂⁺→Hₘ⁺ + CH₍₃₋ₘ₎OD⁺（m = 2，3）。基于同位素取代甲醇所获得的结果，讨论了同位素对氢分子离子发射过程的影响。此外，确定了发生H/D交换的氢分子离子（HD⁺、HD₂⁺和H₂D⁺）的发射，并根据发射方向的各向异性程度估算了H/D交换过程的时间尺度。
The ejection of hydrogen molecular ions from two-body Coulomb explosion processes of methanol (CH3OH, CD3OH and CH3OD) in an intense laser field (800 nm, 60 fs, 0.2 PW cm(-2)) is investigated by a coincidence momentum imaging method. From the coincidence momentum maps, the ejection processes of hydrogen molecular ions, CH3OH2+. H-m(+) + CH(3-m) OH+ (m = 2, 3), CD3OH2+ -> D-m(+) + CH(3-m)OH+ (m = 2,3) and CH3OD2+. H-m(+) + CH(3-m) OD+(m = 2, 3), are identified. Based on the results obtained with isotopically substituted methanol, the isotope effect on the ejection process of hydrogen molecular ions is discussed. Furthermore, the ejection of H/D exchanged hydrogen molecular ions (HD+, HD2+ and H2D+) is identified, and the timescales for the H/D exchanging processes are estimated from the extent of anisotropy in the ejection directions.