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学科主题: 物理化学
题名: Helium Droplets: An Apparatus to Study Ultra Cold Chemistry
作者: Zhang, Cui-mei1, 2, 3;  Zhang, Zhi-guo1, 2, 3;  Huang, Cun-shun1;  Zhang, Qun2, 3;  Chen, Yang2, 3
通讯作者: 黄存顺 ;  陈旸
关键词: Helium droplet ;  Pulsed beam ;  Ion imaging ;  TOF mass spectrum
刊名: CHINESE JOURNAL OF CHEMICAL PHYSICS
发表日期: 2013-06-01
DOI: 10.1063/1674-0068/26/03/270-276
卷: 26, 期:3, 页:270-276
收录类别: SCI
合作性质: 
文章类型: Article
部门归属: 11
项目归属: 1102
产权排名: 待补充
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Physics, Atomic, Molecular & Chemical
资助者: 1,1
研究领域[WOS]: Physics
英文摘要: A new pulsed helium nano droplets machine has been constructed. The droplets were generated by expansion of the pure helium through the cryogenic valve attached to a closed-cycle cryostat. The mean size of helium droplets can be controlled between 10(3) and 10(5) helium atoms by tuning the backing pressure (10-40 bar) and temperature (10-30 K). Compared with the continuous-flow beam source, the density of droplet is at least one order of magnitude higher, which offers the opportunity to combine the system with the commercial pulsed laser to study chemical reactions inside of the superfluid helium at ultra-low temperature. The performance for the system has been checked by studying the photodissociation of CH3I doped droplets at 252 nm with the velocity map imaging technique. The photofragments, CH3, were detected by (2+1) resonance enhanced multiphoton ionization. The speed and angular distributions derived from resulting images show clear evidence of the relaxation effect by the surrounding helium atoms. The pulsed helium droplets depletion spectroscopy was also demonstrated. The depletion spectrum of benzene doped helium droplets indicates that less than 3% depletion can be observed with the newly constructed apparatus.
关键词[WOS]: RESOLUTION INFRARED-SPECTROSCOPY ;  SINGLE SF6 MOLECULES ;  LIQUID-HELIUM ;  HE DROPLETS ;  SUPERFLUID-HELIUM ;  NANODROPLETS ;  COMPLEXES ;  SPECTRA ;  SIZE ;  TETRACENE
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000321989300005
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/119304
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China
2.Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China
3.Univ Sci & Technol China, Dept Chem Phys, Hefei 230026, Peoples R China

Recommended Citation:
Zhang, Cui-mei,Zhang, Zhi-guo,Huang, Cun-shun,et al. Helium Droplets: An Apparatus to Study Ultra Cold Chemistry[J]. CHINESE JOURNAL OF CHEMICAL PHYSICS,2013,26(3):270-276.
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