{"title":"Cold beam of Li7He4 dimers","authors":"Jeremy Glick, William Huntington, Daniel Heinzen","doi":"10.1103/physreva.110.022802","DOIUrl":null,"url":null,"abstract":"We demonstrate an approach for producing a high-flux beam of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mmultiscripts><mi>Li</mi><mprescripts></mprescripts><none></none><mn>7</mn></mmultiscripts><mmultiscripts><mi>He</mi><mprescripts></mprescripts><none></none><mn>4</mn></mmultiscripts></mrow></math> dimers by performing postnozzle seeding of a lithium beam into a supersonic helium expansion. The molecular beam has a longitudinal temperature of 13(6) mK and a continuous flux on the order of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mn>10</mn><mn>11</mn></msup></math> dimers/s confined within a solid angle of 0.16 sr. Monte Carlo simulations of molecular formation based on <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi mathvariant=\"italic\">ab</mi></mrow></math> <i>initio</i> quantum scattering calculations are carried out and compared to the experimentally observed molecular flux. Extensions of this work could lead towards a more quantitative understanding of few-body collision processes of alkali and helium atoms.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":null,"pages":null},"PeriodicalIF":2.9000,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physical Review A","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1103/physreva.110.022802","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"Physics and Astronomy","Score":null,"Total":0}
引用次数: 0
Abstract
We demonstrate an approach for producing a high-flux beam of dimers by performing postnozzle seeding of a lithium beam into a supersonic helium expansion. The molecular beam has a longitudinal temperature of 13(6) mK and a continuous flux on the order of dimers/s confined within a solid angle of 0.16 sr. Monte Carlo simulations of molecular formation based on initio quantum scattering calculations are carried out and compared to the experimentally observed molecular flux. Extensions of this work could lead towards a more quantitative understanding of few-body collision processes of alkali and helium atoms.
我们展示了一种生产高通量 Li7He4 二聚体束的方法，即在超音速氦膨胀中进行锂束后喷嘴播种。分子束的纵向温度为 13(6) mK，在 0.16 sr 的固角范围内，二聚体的连续通量为 1011 个/秒。我们根据 ab initio 量子散射计算对分子的形成进行了蒙特卡罗模拟，并与实验观察到的分子通量进行了比较。这项工作的扩展可以使我们对碱原子和氦原子的少子体碰撞过程有更定量的了解。
期刊介绍：
Physical Review A (PRA) publishes important developments in the rapidly evolving areas of atomic, molecular, and optical (AMO) physics, quantum information, and related fundamental concepts.
PRA covers atomic, molecular, and optical physics, foundations of quantum mechanics, and quantum information, including:
-Fundamental concepts
-Quantum information
-Atomic and molecular structure and dynamics; high-precision measurement
-Atomic and molecular collisions and interactions
-Atomic and molecular processes in external fields, including interactions with strong fields and short pulses
-Matter waves and collective properties of cold atoms and molecules
-Quantum optics, physics of lasers, nonlinear optics, and classical optics
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