Parity effects in Rydberg-state excitation in intense laser fields  

作　　者：YANG LIU XIAOPENG YI QI CHEN TIAN SUN HANG LV SHILIN HU WILHELM BECKER HAIFENG XU JING CHEN 

机构地区：[1]Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China [2]Institute of Applied Physics and Computational Mathematics,Beijing 100088,China [3]Research Center for Advanced Optics and Photoelectronics,Department of Physics,College of Science,Shantou University,Shantou 515063,China [4]Key Laboratory of Intelligent Manufacturing Technology of MOE,Shantou University,Shantou 515063,China [5]Max-Born-Institut,12489 Berlin,Germany [6]Hefei National Laboratory,Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China [7]Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology,Center for Advanced Material Diagnostic Technology,and College of Engineering Physics,Shenzhen Technology University,Shenzhen 518118,China

出　　处：《Photonics Research》2024年第12期3033-3039,共7页光子学研究(英文版)

基　　金：National Key Research and Development Program of China(2019YFA0307700);National Natural Science Foundation of China(12174148,12074144,12074239);Li Ka Shing Foundation STU-GTIIT Joint Research(2024LKSFG02);STU Scientific Research Initiation(NTF23036T).

摘　　要：Conservation of parity plays a fundamental role in our understanding of various quantum processes.However,it is difficult to observe in atomic and molecular processes induced by a strong laser field due to their multiphoton character and the large number of states involved.Here we report an effect of parity in strong-field Rydberg-state excitation(RSE)by comparing the RSE probabilities of the N_(2) molecule and its companion atom Ar,which has a similar ionization potential but opposite parity of its ground state.Experimentally,we observe an oscillatory structure as a function of intensity with a period of about 50 TW∕cm^(2) in the ratio between the RSE yields of the two species,which can be reproduced by simulations using the time-dependent Schrödinger equation(TDSE).We analyze a quantum-mechanical model,which allows for interference of electrons captured in different spatial regions of the Rydberg-state wave function.In the intensity-dependent RSE yield,it results in peaks with alternating heights with a spacing of 25 TW∕cm^(2) and at the same intensity for both species.However,due to the opposite parities of their ground states,pronounced RSE peaks in Ar correspond to less pronounced peaks in N_(2) and vice versa,which leads to the period of 50 TW∕cm^(2) in their ratio.Our work reveals a novel parity-related interference effect in the coherent-capture picture of the RSE process in intense laser fields.

关 键 词：FUNCTION PARITY RYDBERG 

分 类 号：O413[理学—理论物理]