飞秒激光场中甲醇产物离子的角分布

doi:10.3969/j.issn.1000-5641.2015.01.022

华东师范大学学报(自然科学版) ›› 2015, Vol. 2015 ›› Issue (1): 178-185.doi: 10.3969/j.issn.1000-5641.2015.01.022

飞秒激光场中甲醇产物离子的角分布

范晴飞,杨岩,吴华,周彬,王潇,滕憧,孙真荣,吴良平

华东师范大学精密光谱科学与技术国家重点实验室, 上海 200062

收稿日期:2014-03-01 出版日期:2015-01-25 发布日期:2015-03-29
通讯作者: 吴良平, 男,教授, 博士生导师, 研究方向为配位化学, 超分子化学 E-mail:lpwu@ied.ecnu.edu.cn
作者简介:第一作者:范晴飞, 女, 硕士研究生, 研究方向为量子相干控制. E-mail:qingtianfeixiang@sina.com

Angular distributions of photo-fragment ions of CH₃OH molecules in the femtosecond laser fields

FAN Qing-Fei, YANG Yan, WU Hua, ZHOU Bin, WANG Xiao, TENG Chong, SUN Zhen-Rong, WU Liang-Ping

State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China

Received:2014-03-01 Online:2015-01-25 Published:2015-03-29

摘要/Abstract

摘要： 利用直流切片离子成像技术结合飞行时间质谱技术,我们研究了甲醇(CH₃OH)分子在800~nm飞秒激光场中的多光子解离和库仑爆炸过程.获得了甲醇分子在光场中的飞行时间质谱和产物离子的切片影像,分析得到了不同库仑爆炸通道碎片离子的动能分布和角度分布.本文对比分析了C-O键断裂产生H₂O⁺,的H转移通道和产生OH⁺,的非H转移通道的角分布,计算了不同激光强度下两个通道的各向异性参数a₂和cos²θ, 并根据产物离子角度分布与激光强度和离子价态的关系,揭示了甲醇分子在飞秒光场中的准直机制为动力学准直

关键词: 飞秒激光, 角度分布, 分子准直

Abstract: The multi-photon dissociation and coulomb explosion of methanol in the femtosecond laser field have been investigated by dc-slice imaging technique combined with time of flight mass spectroscopy. Time of flight mass spectroscopy and sliced images of fragment ions were obtained, and the kinetic energy release and angular distributions of photo-fragment ions were also measured. The kinetic energy release of CH₂⁺,H₂O⁺ and CH₃⁺,OH⁺ meet the conservation of momentum, it is proved that they come from process of Coulomb explosion. Based on the comparison of the migration pathway and non-migration pathway from the C-O bond cleavage, the intensity dependence of the anisotropy parameter a₂and cos²θ values for each channel were calculated, which indicated the dynamic molecular alignments of methanol in the femtosecond laser fields dominates.

Key words: femtosecond laser, angular distribution, molecule alignment

中图分类号:

O437

范晴飞, 杨岩, 吴华, 周彬, 王潇, 滕憧, 孙真荣, 吴良平. 飞秒激光场中甲醇产物离子的角分布[J]. 华东师范大学学报(自然科学版), 2015, 2015(1): 178-185.

FAN Qing-Fei, YANG Yan, WU Hua, ZHOU Bin, WANG Xiao, TENG Chong, SUN Zhen-Rong, WU Liang-Ping. Angular distributions of photo-fragment ions of CH₃OH molecules in the femtosecond laser fields[J]. Journal of East China Normal University(Natural Sc, 2015, 2015(1): 178-185.

参考文献

HARICH S, LIN J J, LEE Y T, YANG X. Photodissociation dynamics of methanol at 157 nm [J]. J Phys Chem A, 1999, 103: 10324-10332.
FURUKAWA Y, HOSHINA K, YAMANOUCHI K, NAKANO H. Ejection of triatomic hydrogen molecular ion from methanol in intense laser fields [J]. Chem Phys Lett, 2005, 414:117-121.
OKINO T, FURUKAWA Y, LIU P, ICHIKAWA T, ITAKURA R, HOSHINA K, YAMANOUCHI K, NAKANO H. Coincidence momentum imaging of ejection of hydrogen molecular ions from methanol in intense laser fields [J]. Chem Phys Lett, 2006, 419: 223-227.
OKINO T, FURUKAWA Y, LIU P, ICHIKAWA T, ITAKURA R, HOSHINA K, YAMANOUCHI K, NAKANO H. Coincidence momentum imaging of ultrafast hydrogen migration in methanol and its isotopomers in intense laser fields [J]. Chem Phys Lett, 2006, 423: 220-224.
XU H, MARCEAU C, NAKAI K, OKINO T, CHIN S, YAMANOUCHI K. Communication: Two stages of ultrafast hydrogen migration in methanol driven by intense laser fields [J]. J Chem Phys, 2010, 133: 071103.
OKINO T, FURUKAWA Y, LIU P, ICHIKAWA T, ITAKURA R, HOSHINA K, YAMANOUCHI K, NAKANO H. Ejection dynamics of hydrogen molecular ions from methanol in intense laser fields [J]. J Phys B: Atom Mol Opt Phys, 2006, 39: S515-S521.
LIU P, OKINO T, FURUKAWA Y, ICHIKAWA T, ITAKURA R, HOSHINA K, YAMANOUCHI K, NAKANO H. Three-body sequential Coulomb explosions of CH₃OD³⁺ induced by intense laser fields [J]. Chem Phys Lett, 2006, 423: 187-191.
XU H, MARCEAU C, NAKAI K, OKINO T, CHIN S, YAMANOUCHI K. Communication: Two stages of ultrafast hydrogen migration in methanol driven by intense laser fields [J]. J Phys Chem A, 2011, 116: 2686-2690.
孔祥蕾, 罗晓琳等. 纳秒强激光场中甲醇光电离产生高价离子的研究 [J]. 物理学报, 2004, 53(5): 1340-1345.
TANG X , GAO L, WANG Y, WANG C, WANG S, KONG F A. Dissociation of methanol in intense femtosecond laser field [J]. Chinese Sci Bull, 2002, 47(23): 1973-1978.
POSTHUMUS J H, PLUMRIDGE J, THOMAS M K, CODLING K, FRASINSKI L J, LANGLEY L J, TADAY P F. Dynamic and geometric laser-induced alignment of molecules in intense laser fields [J]. J Phys B: Atom Mol Opt Phys, 1998, 31: L553-L562.
CORNAGGIA C, SCHMIDT M, NORMAND D. Coulomb explosion of CO₂ in an intense femtosecond laser field [J]. J Phys B: Atom Mol Opt Phys, 1994, 27: L123-L130.
MIYAZAKI K, SHIMIZU T, NORMAND D. Femtosecond-laser-induced alignment in Coulomb explosion of N₂ [J]. J Phys B: Atom Mol Opt Phys, 2004, 37: 753-761.
SUN S Z, YANG Y, ZHANG J, WU H, CHEN Y T, ZHANG S A, JIA T Q, WANG Z G, SUN Z R. Ejection of triatomic molecular ion from methyl chloride in an intense femtosecond laser field [J]. Chem Phys Lett, 2013, 581: 16-20.
MA R, WU C, XU N, XU N ,HUANG J, YANG H, GONG Q H. Geometric alignment of CH₃I in an intense femtosecond laser field [J]. Chem Phys Lett, 2005, 415: 58-63.
GRAHAM P, LEDINGHAM K, SINGHAI R P, HANKIN S M, MCCANNY T, FANG X, KOSMIDIS C, TZALLAS P, TADAY P F, LANGLEY A J. On the fragment ion angular distributions arising from the tetrahedral molecule CH₃I [J]. J Phys B: Atom Mol Opt Phys, 2001, 34:4015-4026.
ZHANG X, ZHANG D D, LIU H, XU H F, JIN M X, DING D J. Angular distributions of fragment ions in dissociative ionization of CH₂I₂~molecules in intense laser fields [J]. J Phys B: Atom Mol Opt Phys, 2010, 43: 025102-025108.
YANG Y, FAN L L , SUN S Z, ZHANG J, CHEN Y T, ZHANG S A, JIA T Q, SUN Z R. Dissociative double ionization of 1-bromo-2-chloroethane irradiated by an intense femtosecond laser field [J]. J Chem Phys, 2011, 135(7): 064303.
GYO W, ZHU J Y, WANG B X, WANG Y Q, WANG L. Alignment effects of NO in femtosecond laser field [J]. Chem Phys Lett, 2007, 448: 173-177.

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飞秒激光场中甲醇产物离子的角分布

Angular distributions of photo-fragment ions of CH₃OH molecules in the femtosecond laser fields

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Angular distributions of photo-fragment ions of CH₃OH molecules in the femtosecond laser fields