Photoelectron imaging on vibrational excitation and Rydberg intermediate states in multi-photon ionization process of NH3 molecule

doi:10.1088/1674-1056/ab9431

中国物理B ›› 2020, Vol. 29 ›› Issue (9): 93201-093201.doi: 10.1088/1674-1056/ab9431

Photoelectron imaging on vibrational excitation and Rydberg intermediate states in multi-photon ionization process of NH₃ molecule

1 Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
2 College of Electronic Science and Engineering, State Key Laboratory on Integrated Optoelectronics, Jilin University, Changchun 130012, China;
3 Jilin Institute of Chemical Technology, Jilin 132022, China;
4 Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University, Changchun 130012, China;
5 Department of Comprehensive, Harbin City Vocational College, Haerbin 150000, China

收稿日期:2020-03-31 修回日期:2020-05-14 接受日期:2020-05-19 出版日期:2020-09-05 发布日期:2020-09-05
通讯作者: Fu-Chun Liu E-mail:lfc@jlu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11574116, 11534004, and 10704028).

Photoelectron imaging on vibrational excitation and Rydberg intermediate states in multi-photon ionization process of NH₃ molecule

Ya-Nan Sun(孙亚楠)^1,4, Yan-Hui Wang(王艳辉)², Le-Le Song(宋乐乐)^1,3, Hai-Bin Du(杜海滨)⁵, Xiao-Chun Wang(王晓春)^1,4, Lan-Lai He(赫兰海)^1,4, Si-Zuo Luo(罗嗣佐)^1,4, Qin Yang(杨钦)^1,4, Jing Leng(冷静)^1,4, Fu-Chun Liu(刘福春)^1,4

1 Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
2 College of Electronic Science and Engineering, State Key Laboratory on Integrated Optoelectronics, Jilin University, Changchun 130012, China;
3 Jilin Institute of Chemical Technology, Jilin 132022, China;
4 Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University, Changchun 130012, China;
5 Department of Comprehensive, Harbin City Vocational College, Haerbin 150000, China

Received:2020-03-31 Revised:2020-05-14 Accepted:2020-05-19 Online:2020-09-05 Published:2020-09-05
Contact: Fu-Chun Liu E-mail:lfc@jlu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11574116, 11534004, and 10704028).

摘要/Abstract

摘要： The ionization processes of NH₃ molecule are studied by photoelectron velocity map imaging technique in a linearly polarized 400-nm femtosecond laser field. The two-dimensional photoelectron images from ammonia molecules under different laser intensities are obtained. In the slow electron region, the values of kinetic energy of photoelectrons corresponding to peaks 1, 2, 3, and 4 are 0.27, 0.86, 1.16, and 1.6 eV, respectively. With both the kinetic energy and angular distribution of photoelectrons from NH₃ molecules, we can confirm that the two-photon excited intermediate Rydberg state is A^~1 A₂" (v₂'=3) state for photoelectron peaks 2, 3, 4, and the three peaks are marked as 1²2³ (2 + 2), 1¹2³ (2 + 2), and 1⁰2³ (2 + 2) multi-photon processes, respectively. Then, peak 1 is found by adding a hexapole between the source chamber and the detection chamber to realize the rotational state selection and beam focusing. Peak 1 is labeled as the 1³2³ (3 + 1) multi-photon process through the intermediate Rydberg state E^~1A₁'. The phenomena of channel switching are found in the slow electron kinetic energy distributions. Our calculations and experimental results indicate that the stretching vibrational mode of ammonia molecules varies with channels, while the umbrella vibration does not. In addition, we consider and discuss the ac-Stark effect in a strong laser field. Peaks 5 and 6 are marked as (2 + 2 + 1) and (2 + 2 + 2) above threshold ionization processes in the fast electron region.

关键词: photoelectron velocity map imaging, photelectron angular distributions, Rydberg state, hexapole

Abstract: The ionization processes of NH₃ molecule are studied by photoelectron velocity map imaging technique in a linearly polarized 400-nm femtosecond laser field. The two-dimensional photoelectron images from ammonia molecules under different laser intensities are obtained. In the slow electron region, the values of kinetic energy of photoelectrons corresponding to peaks 1, 2, 3, and 4 are 0.27, 0.86, 1.16, and 1.6 eV, respectively. With both the kinetic energy and angular distribution of photoelectrons from NH₃ molecules, we can confirm that the two-photon excited intermediate Rydberg state is A^~1 A₂" (v₂'=3) state for photoelectron peaks 2, 3, 4, and the three peaks are marked as 1²2³ (2 + 2), 1¹2³ (2 + 2), and 1⁰2³ (2 + 2) multi-photon processes, respectively. Then, peak 1 is found by adding a hexapole between the source chamber and the detection chamber to realize the rotational state selection and beam focusing. Peak 1 is labeled as the 1³2³ (3 + 1) multi-photon process through the intermediate Rydberg state E^~1A₁'. The phenomena of channel switching are found in the slow electron kinetic energy distributions. Our calculations and experimental results indicate that the stretching vibrational mode of ammonia molecules varies with channels, while the umbrella vibration does not. In addition, we consider and discuss the ac-Stark effect in a strong laser field. Peaks 5 and 6 are marked as (2 + 2 + 1) and (2 + 2 + 2) above threshold ionization processes in the fast electron region.

Key words: photoelectron velocity map imaging, photelectron angular distributions, Rydberg state, hexapole

中图分类号: (Multiphoton ionization and excitation to highly excited states)

32.80.Rm

32.60.+i (Zeeman and Stark effects) 32.80.Fb (Photoionization of atoms and ions)

孙亚楠, 王艳辉, 宋乐乐, 杜海滨, 王晓春, 赫兰海, 罗嗣佐, 杨钦, 冷静, 刘福春. Photoelectron imaging on vibrational excitation and Rydberg intermediate states in multi-photon ionization process of NH₃ molecule[J]. 中国物理B, 2020, 29(9): 93201-093201.

Ya-Nan Sun(孙亚楠), Yan-Hui Wang(王艳辉), Le-Le Song(宋乐乐), Hai-Bin Du(杜海滨), Xiao-Chun Wang(王晓春), Lan-Lai He(赫兰海), Si-Zuo Luo(罗嗣佐), Qin Yang(杨钦), Jing Leng(冷静), Fu-Chun Liu(刘福春). Photoelectron imaging on vibrational excitation and Rydberg intermediate states in multi-photon ionization process of NH₃ molecule[J]. Chin. Phys. B, 2020, 29(9): 93201-093201.

参考文献 35

[1]	Popmintchev T 2013 Am. Assoc. For Advancement Sci. Annu. Meeting Hynes Convention Center, February 17
[2]	Kulander K C 1987 Phys. Rev. A 35 445 doi: 10.1103/PhysRevA.35.445
[3]	Fittinghoff D N, Bolton P R and Chang B 1992 Phys. Rev. Lett. 69 2642 doi: 10.1103/PhysRevLett.69.2642
[4]	Ganeev R A 2009 Phys-usp+ 52 65
[5]	VagerZ, Naaman R and Kanter E P 1989 Science 244 426 doi: 10.1126/science.244.4903.426
[6]	Ashfold M N R, Langford S R, Morgan R A, Orr-Ewing A, Western C, Scheper C and De Lange C 1998 Eur. Phys. J. D 4 189 doi: 10.1007/s100530050199
[7]	Li M, Zhang P, Luo S, ZhouY, Zhang Q B, Lan P F and Lu P X 2015 Phys. Rev. A 92 063404 doi: 10.1103/PhysRevA.92.063404
[8]	Oppermann M, Weber S J and Frasinski L J 2013 Phys. Rev. A 88 043432 doi: 10.1103/PhysRevA.88.043432
[9]	Yuan L W, Wang Y Q and Li W 2004 Sci. China- Chem. 47 283 doi: 10.1360/03yb0251
[10]	Tang Y, Suzuki Y, Horio T and Suzuki T 2010 Phys. Rev. Lett. 104 073002 doi: 10.1103/PhysRevLett.104.073002
[11]	Agostini P, Fabre F, Mainfray G, Petite G and Rahman N K 1979 Phys. Rev. Lett. 42 1127 doi: 10.1103/PhysRevLett.42.1127
[12]	Song L L, Sun Y N, Wang Y H, Wang X C, He L H, Luo S Z, Hu W H, Tong Q N Ding D J and Liu F 2019 Chin. Phys. B 28 063201 doi: 10.1088/1674-1056/28/6/063201
[13]	Cooper J and Zare R N 1968 J. Chem. Phys. 48 942 doi: 10.1063/1.1668742
[14]	Wu J, Schmidt L, Kunitski M, Meckel M, Voss S, Sann H, Kim H, Jahnke T, Czasch A and Dörner R 2012 Phys. Rev. Lett. 108 183001 doi: 10.1103/PhysRevLett.108.183001
[15]	Paul H, Katharine L R and MichaelS 2010 Mol. Phys. 108 1045 doi: 10.1080/00268971003639266
[16]	BieSuer J, Schnieder L, Schnieder J, et al. 1988 J. Chem. Phys. 88 3607 doi: 10.1063/1.453910
[17]	Xie J, Jiang B, Li G, Yang S, Xu J, Sha G, Xu D, Lou N and Zhang C 2000 Faraday Discuss 115 127 doi: 10.1039/b000301h
[18]	Rodríguez J D, González M G, Rubio L L and Banares L 2014 Phys. Chem. Chem. Phys. 16 3757 doi: 10.1039/c3cp54362e
[19]	Nieman G C and Colson S D 1978 J. Chem. Phys. 68 5656 doi: 10.1063/1.435700
[20]	Hockett P, Staniforth M, Reid K L and Townsend D 2009 Phys. Rev. Lett. 102 253002 doi: 10.1103/PhysRevLett.102.253002
[21]	Meng Q T and Han K L 2004 J. Atom. Mol. Phys. B04 260
[22]	Glownia J H, Riley S J, Colson S D and Nieman G C 1980 J. Chem. Phys. 73 4296 doi: 10.1063/1.440711
[23]	Ashfold M N R, Western C M, Hudgens J W and Johnson R D 1996 Chem. Phys. Lett. 260 27 doi: 10.1016/0009-2614(96)00803-2
[24]	Ashfold M N R, Dixon R N and Stickland R J 1984 Chem. Phys. 88 463 doi: 10.1016/0301-0104(84)87012-3
[25]	Luo S Z, Zhu R H, He L H, Hu W, Li X, Ma P, Wang C C, Liu F C, Roeterdink W G, Stolte S and Ding D J 2015 Phys. Rev. A 91 053408 doi: 10.1103/PhysRevA.91.053408
[26]	Evans N L, Yu H, Roberts G M, Stavros V G and Ullrich S 2012 Phys. Chem. Chem. Phys. 14 10401 doi: 10.1039/c2cp40178a
[27]	Bennewitz H G, Paul W and Schlier C Z 1955 Physik 141 6 doi: 10.1007/BF01327279
[28]	Dunlavey S J, Dyke J M, Jonathan N and Morris A 1980 Mol. Phys. 39 1121 doi: 10.1080/00268978000100931
[29]	Locht R, Servais C, Ligot M and Momigny J 1988 Chem. Phys. 123 443 doi: 10.1016/0301-0104(88)87053-8
[30]	Liu F C, Jin M X, Gao X and Ding D J 2006 Chin. Phys. Lett. 23 344 doi: 10.1088/0256-307X/23/2/019
[31]	Liu F C, Jin M X and Ding D J 2006 Chin. Phys. Lett. 23 1165 doi: 10.1088/0256-307X/23/5/028
[32]	Song L L, WangY H, Wang X C, Sun H T, He L H, Luo S Z, Hu W H, Li D X, Zhu W H, Sun Y N, Ding D J and Liu F C 2019 Chin. Phys. B 28 023101 doi: 10.1088/1674-1056/28/2/023101
[33]	Mcfarland B K, Farrell J P, Bucksbaum P H and Gühr M 2008 Science 322 1232 doi: 10.1126/science.1162780
[34]	Farrell J P, Petretti S, Förster J, McFarland B K, Spector L S, Vanne Y V, Decleva P, Bucksbaum P H, Saenz A and Gühr M 2011 Phys. Rev. Lett. 107 083001 doi: 10.1103/PhysRevLett.107.083001
[35]	Ohmura H and Nakanaga T 2004 J. Chem. Phys. 120 5176 doi: 10.1063/1.1644102

Photoelectron imaging on vibrational excitation and Rydberg intermediate states in multi-photon ionization process of NH₃ molecule

Photoelectron imaging on vibrational excitation and Rydberg intermediate states in multi-photon ionization process of NH₃ molecule

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