Channel competition in dissociation of ammonia clusters (n ≤ 5) induced by femtosecond laser fields

doi:10.1088/1674-1056/ada552

中国物理B ›› 2025, Vol. 34 ›› Issue (3): 33302-033302.doi: 10.1088/1674-1056/ada552

Channel competition in dissociation of ammonia clusters (n ≤ 5) induced by femtosecond laser fields

Tao Yang(杨涛)¹, Xinyu Zhang(张馨予)², Xing Li(李兴)^1,3, Wankai Li(李万凯)¹, Menghao Wei(卫孟昊)¹, Dongdong Zhang(张栋栋)¹, Lanhai He(赫兰海)^1,†, and Dajun Ding(丁大军)^1,‡

1 Institute of Atomic and Molecular Physics, Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University, Changchun 130012, China;
2 Basic Courses Department, Tianjin Sino-German University of Applied Sciences, Tianjin 300350, China;
3 Institute of Atom Manufacturing, Nanjing University, Nanjing 210093, China

收稿日期:2024-12-23 修回日期:2024-12-26 接受日期:2025-01-03 发布日期:2025-03-15
通讯作者: Lanhai He, Dajun Ding E-mail:helanhai@jlu.edu.cn;dajund@jlu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 92261201, 12134005, and 12334011).

Channel competition in dissociation of ammonia clusters (n ≤ 5) induced by femtosecond laser fields

1 Institute of Atomic and Molecular Physics, Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University, Changchun 130012, China;
2 Basic Courses Department, Tianjin Sino-German University of Applied Sciences, Tianjin 300350, China;
3 Institute of Atom Manufacturing, Nanjing University, Nanjing 210093, China

Received:2024-12-23 Revised:2024-12-26 Accepted:2025-01-03 Published:2025-03-15
Contact: Lanhai He, Dajun Ding E-mail:helanhai@jlu.edu.cn;dajund@jlu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 92261201, 12134005, and 12334011).

摘要/Abstract

摘要： We investigated the ionization and dissociation processes of ammonia clusters ranging from dimer to pentamer induced by 800-nm femtosecond laser fields. Time-of-flight (TOF) mass spectra of the ammonia clusters were recorded over a range of laser intensities from 2.1$\times10^{12}$ W/$\text{cm}^{2}$ to 5.6$\times10^{12}$ W/$\text{cm}^{2}$. The protonated ion signals dominate the spectra, which is consistent with the stability of the geometric structures. The ionization and dissociation channels of ammonia clusters are discussed. The competition and switching among observed dissociation channels are revealed by analyzing the variations in the relative ionic yields of specific protonated and unprotonated clusters under different laser intensities. These results indicate that the ionization of the neutral multiple-ammonia units, produced through the dissociation of cluster ions, may start to contribute, as well as the additional processes to consume protonated ions and/or produce unprotonated ions induced by the femtosecond laser fields when the laser intensity is above $\sim4\times10^{12} \text{W/cm}^2$. These findings provide deeper insights into the ionization and dissociation dynamics in multi-photon ionization experiments involving ammonia clusters.

关键词: ammonia cluster, ionization and dissociation, femtosecond laser

Abstract: We investigated the ionization and dissociation processes of ammonia clusters ranging from dimer to pentamer induced by 800-nm femtosecond laser fields. Time-of-flight (TOF) mass spectra of the ammonia clusters were recorded over a range of laser intensities from 2.1$\times10^{12}$ W/$\text{cm}^{2}$ to 5.6$\times10^{12}$ W/$\text{cm}^{2}$. The protonated ion signals dominate the spectra, which is consistent with the stability of the geometric structures. The ionization and dissociation channels of ammonia clusters are discussed. The competition and switching among observed dissociation channels are revealed by analyzing the variations in the relative ionic yields of specific protonated and unprotonated clusters under different laser intensities. These results indicate that the ionization of the neutral multiple-ammonia units, produced through the dissociation of cluster ions, may start to contribute, as well as the additional processes to consume protonated ions and/or produce unprotonated ions induced by the femtosecond laser fields when the laser intensity is above $\sim4\times10^{12} \text{W/cm}^2$. These findings provide deeper insights into the ionization and dissociation dynamics in multi-photon ionization experiments involving ammonia clusters.

Key words: ammonia cluster, ionization and dissociation, femtosecond laser

中图分类号: (Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))

33.80.Rv

36.40.-c (Atomic and molecular clusters) 36.40.Wa (Charged clusters)

Tao Yang(杨涛), Xinyu Zhang(张馨予), Xing Li(李兴), Wankai Li(李万凯), Menghao Wei(卫孟昊), Dongdong Zhang(张栋栋), Lanhai He(赫兰海), and Dajun Ding(丁大军). Channel competition in dissociation of ammonia clusters (n ≤ 5) induced by femtosecond laser fields[J]. 中国物理B, 2025, 34(3): 33302-033302.

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Channel competition in dissociation of ammonia clusters (n ≤ 5) induced by femtosecond laser fields

Channel competition in dissociation of ammonia clusters (n ≤ 5) induced by femtosecond laser fields

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