蒸发激光和载气强度对C_n^-质谱特征的影响  

Influence of Intensities of the Vaporizing Laser and Carrier Gas on Features of C_n^- Mass Spectra

作　　者：刘丙辰[1] 翟华金[1] 周汝枋[1] 倪国权[1] 徐至展[2] 

机构地区：[1]中国科学院量子光学开放实验室 [2]中国科学院强光光学开放实验室,中国科学院上海光机所上海201800

出　　处：《中国激光》2001年第5期426-428,共3页Chinese Journal of Lasers

基　　金：国家自然科学基金!(No.2 9890 2 10 )资助项目

摘　　要：用激光蒸发石墨靶棒 ,脉冲载气 (carriergas)冷却的方法产生碳团簇 ,由飞行时间质谱仪测得碳团簇负离子的飞行时间质谱。通过对质谱的研究 ,揭示出随着尺寸的增长 ,碳团簇的结构由环状为主变为由笼状占大多数。Carbon cluster anions are generated by a standard laser vaporization/pulsed molecular beam scheme and detected with a time of flight mass spectrometer. Through the study of mass spectra, it is revealed that the structure of most carbon clusters transforms from rings to cages as the cluster size grows up. The discussion is focussed on how the intensities of the vaporizing laser and carrier gas influence the characteristics of the  C - n mass spectra.

关 键 词：碳团簇负离子 飞行时间质谱 质谱特征 载气强度 蒸发激光 

分 类 号：O657.6[理学—分析化学]