窄脉冲分子束系统的发展与表征.pdf
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1、CHINESE JOURNAL OF CHEMICAL PHYSICSVOLUME 36,NUMBER 3JUNE 27,2023ARTICLEDevelopment and Characterization of a Narrow-Pulsed Molecular BeamSystemYurun Xiea,d,Heyang Liua,Yue Xiaoa,Jie Hana,Zhichao Lia,Yuzhao Wanga,Tao Wanga,Xueming Yanga,b,c,Tiangang Yangaa.Shenzhen Key Laboratory of Energy Chemistry
2、&Department of Chemistry,Southern University ofScience and Technology,Shenzhen 518055,Chinab.State Key Laboratory of Molecular Reaction Dynamics,Dalian Institute of Chemical Physics,ChineseAcademy of Science,Dalian 116023,Chinac.Hefei National Laboratory,Hefei 230088,Chinad.Institute of Advanced Sci
3、ence Facilities,Shenzhen 518107,China(Dated:Received on March 26,2023;Accepted on April 14,2023)A narrow-pulsed and velocity-controlledmolecular beam system is constructed byusing a high-speed chopper and a tempera-ture adjustable pulsed valve.The durationof the hydrogen molecular beam pulse isreduc
4、ed to approximately 6.3 s and char-acterized using resonance-enhanced multi-photon ionization(REMPI)at a distanceof 193 mm downstream from the nozzle.To precisely determine the velocity of thehydrogen molecules,a pump-probe tech-nique combining stimulated Raman pumping and REMPI is employed at a fix
5、ed distance(193 mm)with nanosecond lasers.By adjusting the temperature of the pulsed valve,thevelocity of the hydrogen beam varies continuously from 1290 m/s to 3550 m/s.The sys-tem exhibits potential for multiple applications in the field of chemical reaction dynamics,including its potential to int
6、egrate with ion traps and surface scattering experiments.Key words:Molecular beam,Chemical reaction dynamics,Resonance-enhanced multipho-ton ionizationI.INTRODUCTIONMolecular and atomic beams have become essentialtools in various areas of the experimental physics andchemistry,including precision mea
7、surement 13 andchemical reaction dynamics 48.Pulsed supersonicbeams are compatible with high-power pulsed lasers andhave made many gas-phase molecular experiments pos-Part of the special topic for“the Chinese Chemical Societys17th National Chemical Dynamics Symposium”These authors contributed equall
8、y to this work.Author to whom correspondence should be addressed.E-mail:sible by increasing beam density and maintaining highvacuum conditions.In recent years,significant progresshas been made in producing short-pulsed and velocity-selected beams to control the translational motion of themolecules 9
9、,10.This is critical for improving spec-troscopy resolution and reducing the collision energyspreading in the scattering experiments.These well-developed beams have enabled exploration of collisionresonances 1113 and opened doors to cold chemistry,where interesting phenomena such as quantum tunnel-i
10、ng have been observed 14.However,the broaden-ing of the beams translational energy,which results inlower collision energy resolution,remains a limitationin these experiments.This work aims to address thisDOI:10.1063/1674-0068/cjcp2303025259c 2023 Chinese Physical Society260Chin.J.Chem.Phys.,Vol.36,N
11、o.3Yurun Xie et al.issue by generating a short-pulsed beam.There areseveral ways to generate short-pulsed molecular beams,which usually start with a fast-switching valve followedby speed selectors such as the decelerator and the chop-per.A pulsed molecular beams duration is typicallytens to hundreds
12、 of microseconds,generated from apulsed valve 1521.One commonly used commer-cial valve is the General Valve Series 9,which is con-structed using stainless steel with a nozzle sealed by aconical Teflon tip.The tip is driven by a solenoid toproduce a pulsed supersonic molecular beam,and thegas pulses
13、are often more than 100 s 21.To narrowthe pulse duration,Janssen used a cantilever piezo tomake a shorter,7 s pulsed beam measured at a posi-tion 100 mm downstream of the nozzle exit 17.TheEven-Lavie pulsed valve 1820 uses lightweight com-ponents to enable fast switching.It generates a highintensity
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- 脉冲 分子 系统 发展 表征
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