RUI: Hyperfine Structure Effects in Hydrogen Atom Collisions

RUI：氢原子碰撞中的超精细结构效应

• 批准号: 9313811
• 负责人: Stuart Crampton
• 金额: $ 13.5万
• 依托单位: Williams College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-08-01 至 1998-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9313811&HistoricalAwards=false
• 关键词: RUI; Hyperfine; Structure; Effects; Hydrogen

This RUI program will measure frequency shifts due to the effects of hyperfine structure during low energy electron spin exchange collisions between ground state hydrogen atoms in a cryogenic hydrogen maser operating near 11K with solid neon storage surfaces. Monte Carlo techniques will be used to model all other potential perturbations of the oscillation frequency of the hydrogen maser and the cryogenic hydrogen maser being used at the Harvard Center for Astrophysics to measure the hyperfine induced collision shifts near 0.5. The results will probe the breakdown of the Born-Oppenheimer approximation in low energy atomic collisions and the degree to which collisions between hydrogen atoms may limit the potential stability of cryogenic hydrogen maser frequency standards.

该RUI计划将测量由于超精细结构的影响，在低能量电子自旋交换碰撞基态氢原子在低温氢脉泽工作近11 K与固体氖存储表面之间的频率偏移。 蒙特卡罗技术将用于模拟氢脉泽和低温氢脉泽振荡频率的所有其他潜在扰动，该氢脉泽和低温氢脉泽正在哈佛天体物理中心用于测量0.5附近的超精细诱导碰撞位移。 结果将探讨在低能量原子碰撞和氢原子之间的碰撞可能限制低温氢脉泽频率标准的潜在稳定性的程度Born-Oppenheimer近似的故障。