Pressure shifts in high-precision hydrogen spectroscopy: II. Impact approximation and Monte-Carlo simulations
Pressure shifts in high-precision hydrogen spectroscopy: II. Impact approximation and Monte-Carlo simulations
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高精度氢谱中的压力变化:II 冲击近似和蒙特卡罗模拟
DOI:
10.1088/1361-6455/ab08e1-1
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
U. D. Jentschura
中科院分区:
文献类型:
--
作者:
A. Matveev;N. Kolachevsky;C. M. Adhikari;U. D. Jentschura
We investigate collisional shifts of spectral lines involving excited hydrogenic states, where van der Waals coefficients have recently been shown to have large numerical values when expressed in atomic units. Particular emphasis is laid on the recent hydrogen 2S–4P experiment (and an ongoing 2S–6P experiment) in Garching, but numerical input data are provided for other transitions (eg involving S states), as well. We show that the frequency shifts can be described, to sufficient accuracy, in the impact approximation. The pressure related effects were separated into two parts,(i) related to collisions of atoms inside of the beam, and (ii) related to collisions of the atoms in the atomic beam with the residual background gas. The latter contains both atomic as well as molecular hydrogen. The dominant effect of intra-beam collisions is evaluated by a Monte-Carlo simulation, taking the geometry of the experimental apparatus into account. While, in the Garching experiment, the collisional shift is on the order of 10 Hz, and thus negligible, it can decisively depend on the experimental conditions. We present input data which can be used in order to describe the effect for other transitions of current and planned experimental interest.
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影响因子:
8.6
作者:
I. I. Sobelʹman
通讯作者:
I. I. Sobelʹman
影响因子:
2.9
作者:
U. Jentschura;V. Debierre;C. Adhikari;A. Matveev;N. Kolachevsky
通讯作者:
N. Kolachevsky
影响因子:
1.8
作者:
U. Jentschura;C. Adhikari
通讯作者:
U. Jentschura;C. Adhikari
影响因子:
2.9
作者:
Axel Beyer;Lothar Maisenbacher;Ksenia Khabarova;Arthur Matveev;Randolf Pohl;Thomas Udem;Theodor W Haensch;Nikolai Kolachevsky
通讯作者:
Nikolai Kolachevsky
DOI:
10.1088/1361-6455/ab08cc-1
发表时间:
2019
期刊:
Journal of Physics B: Atomic, Molecular and Optical Physics
影响因子:
--
作者:
U. D. Jentschura;C. M. Adhikari;R. Dawes;A. Matveev;N. Kolachevsky
通讯作者:
N. Kolachevsky