CAJ | 학술논문

报导了用自制飞秒激光器通过飞秒多光子电离质谱和光电子能谱对飞秒强激光场与分子（氨、苯）相互作用的研究。飞秒激光脉宽约100fs,二倍频中心波长407.5nm,聚焦后脉冲功率密度达到1012W/cm2。氨的光电子能谱显示了（2+2）REMPI和（2+2）+1ATI、（2+2）+2ATI三组电子峰，每组峰又包括伸缩振动v1的带系，ATI峰的振动布居出现反转。随着光强增加，谱峰加宽而且振动能级出现平移。这些强场效应可用PonderomotivePotential解释。苯的飞秒质谱图与纳秒情况不同，分子离子为主，碎片峰很少。
보도료용자제비초격광기통과비초다광자전리질보화광전자능보대비초강격광장여분자（안、분）상호작용적연구。비초격광맥관약100fs,이배빈중심파장407.5nm,취초후맥충공솔밀도체도1012W/cm2。안적광전자능보현시료（2+2）REMPI화（2+2）+1ATI、（2+2）+2ATI삼조전자봉，매조봉우포괄신축진동v1적대계，ATI봉적진동포거출현반전。수착광강증가，보봉가관이차진동능급출현평이。저사강장효응가용PonderomotivePotential해석。분적비초질보도여납초정황불동，분자리자위주，쇄편봉흔소。
The photoionization dynamics of ammonia and benzene was studied by home-built femtosecond laser and TOF mass/photoelectron spectrometer.Beam intensities of 1012W/cm2 were used with laser pulse width of 100fs and wavelength of 407.5nm.In the PE spectra of NH3,three(2+2)REMPI and (2+2)+1 ATI,(2+2)+2 ATI were shown,within each peak a progression of stretchin gvibrations v1 were found.The vibrational distribution of ATI peaks are inverted compared to normal(2+2)REMPI.High laser power has also caused band broadening and shifting effect,which are given rise to by the pondromotive potential of intense laser.Differ-ent from that of nanosecond,benzene phtoionization using femtosecond laser has predominent molecular ion peak with very small percentage of fragments.