原子与分子物理学报
原子與分子物理學報
원자여분자물이학보
CHINESE JOURNAL OF ATOMIC AND MOLECULAR PHYSICS
2008年
6期
1323-1327
,共5页
刘艳%于若飞%朱颀人%杨玉军
劉豔%于若飛%硃頎人%楊玉軍
류염%우약비%주기인%양옥군
超拉曼谱线%高次谐波%叠加态
超拉曼譜線%高次諧波%疊加態
초랍만보선%고차해파%첩가태
hyper-Raman lines%high harmonic%superposition state
本文研究了单电子分子离子与强激光场相互作用下的高次谐波发射谱.从光谱中观察到除了存在入射激光频率奇数倍的谐波谱线外,还存在其他频率的超拉曼谱线.在理论上阐明了超拉曼谱线不同于高次谐波谱线的物理产生机制.研究发现当体系初态为基态和较高激发态的叠加态时能够较清晰的观察到超拉曼谱线,从而说明激发态电子的布居对超拉曼谱线的产生起着关键作用.因此在实验上,制备一个叠加态使得电子从激发态电离,是观察到超拉曼谱线的重要条件.
本文研究瞭單電子分子離子與彊激光場相互作用下的高次諧波髮射譜.從光譜中觀察到除瞭存在入射激光頻率奇數倍的諧波譜線外,還存在其他頻率的超拉曼譜線.在理論上闡明瞭超拉曼譜線不同于高次諧波譜線的物理產生機製.研究髮現噹體繫初態為基態和較高激髮態的疊加態時能夠較清晰的觀察到超拉曼譜線,從而說明激髮態電子的佈居對超拉曼譜線的產生起著關鍵作用.因此在實驗上,製備一箇疊加態使得電子從激髮態電離,是觀察到超拉曼譜線的重要條件.
본문연구료단전자분자리자여강격광장상호작용하적고차해파발사보.종광보중관찰도제료존재입사격광빈솔기수배적해파보선외,환존재기타빈솔적초랍만보선.재이론상천명료초랍만보선불동우고차해파보선적물리산생궤제.연구발현당체계초태위기태화교고격발태적첩가태시능구교청석적관찰도초랍만보선,종이설명격발태전자적포거대초랍만보선적산생기착관건작용.인차재실험상,제비일개첩가태사득전자종격발태전리,시관찰도초랍만보선적중요조건.
We investigated high harmonic generated from the interaction of intense pulses with a one-electron model molecular ion. When the intensity of the laser pulse is weak,the hyper-Raman (HR) lines are observed clearly. With the increase of the laser intensity, the HR lines only appeared as the background of high harmonic generation (HHG) due to its weak intensity. This phenomenon is attributed to the various roles of excited states in the different laser intensity. To observe the HR lines in the experiment, it is necessary to prepare a superposition states by adding an additional long laser pulse.