两步激光－飞行时间质谱法测定铁和镍同位素  

DETERMINATION OF THE ISOTOPIC ABUNDANCE OF IRON AND NICKEL WITH TWO-STEP LASER TIME-OF-FLIGHT MASS SPECTROMETRY

作　　者：周鸣飞[1] 秦启宗[1] 

机构地区：[1]复旦大学激光化学研究所

出　　处：《核化学与放射化学》1996年第4期197-201,共5页Journal of Nuclear and Radiochemistry

基　　金：国家自然科学基金;核工业总公司科学基金

摘　　要：采用两步激光－飞行时间质谱法测定了铁和镍同位素。用５３２ｎｍ脉冲激光蒸发铁－镍合金及硫酸亚铁样品，蒸发产生的原子采用染料激光共振电离并由飞行时间质谱探测。结果表明，激光蒸发产生的原子束和共振电离激光之间具有很好的时间匹配效率，与连续加热原子化源相比，样品利用率提高了约三个量级。Two-step laser time-of-flight mass spectrometry is established to measure the isotopic abun dance of iron and nickel.A pulsed Nd:YAG laser(532nm) is used to evaporate iron and nickel atoms from a meral alloy sample,These atoms are ionized by a Nd:YAG pumped pulsed dye laser ar 300. 7nm and 303.4nm via resonance ionization and subsequently detected by time-of-flight mass spectrometry. Arrival time distributions are obtained by varying the time delay between e vaporarion laser and ionization laser,Overlap of the pulsed atomic beam and the ionization laser beam is excellent with about 1%effective duty cycle,then the sensitivity of isotopic detection will be increased substantially using resonance ionization time-of-flight mass spectrometry,A one color two-photon(1+1)ionization scheme is employed for Fe and Ni atoms,Our results show that all the measured isotopic abundances of Fe and Ni are in agreement with values published in the lit erature.

关 键 词：两步激光质谱 共振电 离 铁 镍 

分 类 号：O614.81[理学—无机化学] O657.6[理学—化学]