Observation of rotational coherence in an excited state of CO+

被引：3
|
作者：
Wan, Y. X. [1 ,2 ,3 ]
Fu, B. T. [1 ,2 ,3 ,4 ]
Xie, H. Q. [5 ]
Yu, S. P. [1 ,2 ,3 ]
Lei, H. B. [6 ]
Zhang, F. B. [1 ,2 ,3 ]
Zhang, Z. H. [1 ,2 ,3 ,4 ]
Qiao, L. L. [1 ,2 ]
Li, G. H. [7 ]
Zhao, J. [6 ]
Zhao, Z. X. [6 ]
Yao, J. P. [1 ,2 ]
Cheng, Y. [1 ,2 ]
机构：
[1] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech SIOM, State Key Lab High Field Laser Phys, Shanghai 201800, Peoples R China
[2] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech SIOM, CAS Ctr Excellence Ultraintense Laser Sci, Shanghai 201800, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[4] ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 200031, Peoples R China
[5] East China Univ Technol, Sch Sci, Nanchang 330013, Jiangxi, Peoples R China
[6] Natl Univ Def Technol, Dept Phys, Changsha 410073, Peoples R China
[7] East China Jiaotong Univ, Sch Sci, Nanchang 330013, Jiangxi, Peoples R China
来源：
OPTICS LETTERS | 2021年 / 46卷 / 16期
基金：
中国国家自然科学基金;
关键词：
INVERSION; N-2(+); SYSTEM; OPTICS;
D O I：
10.1364/OL.432315
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The vacuum ultraviolet (VUV) radiation is generated in the strong-field-ionized CO molecules through 2 + 1 resonance excitation with two-color femtosecond laser pulses. When scanning the relative delay between two pump pulses, the rotational-resolved VUV radiations show periodic oscillations lasting as long as 500 ps. Fourier analysis reveals that these oscillations correspond to rotational beat frequencies of the A(2) Pi(i) state of CO+, which is the result of multi-channel interference during the resonant excitation process. High resolution of Fourier transform spectra up to 0.067 cm(-1) allows us to obtain the fine energy levels of the A(2) Pi(i) state. The theoretical calculation is in good agreement with the experimental observation. This work reveals the rotational coherence of the ionic excited state and shows the prospect of rotational coherence spectroscopy in measuring fine structures of molecular ions. (C) 2021 Optical Society of America
引用
收藏
页码：3893 / 3896
页数：4
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