Dipole_dipole interactions between atoms in a partly excited resonance gas

31st International Conference on Equations of State for Matter

Sautenkov, V.A.^1,2

Joint Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya 13 Bldg 2, Moscow

125412, Russia^1

Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Avenue 53, Moscow

119991, Russia^2

关键词: Atomic collision;    Atomic transition;    Dipole dipole interactions;    Doppler width;    Gas medium;    Impact collision;    Rarefied gas;    Standard theories;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/774/1/012126/pdf
DOI  :  10.1088/1742-6596/774/1/012126

来源: IOP

【 摘 要 】

In this paper, our experimental studies of dipole-dipole interactions in excited resonance gases are discussed. In weakly excited gas the dipole broadening of optical transitions is proportional to its density N. A gas medium can be identified by its density N as rarefied gas, where dipole broadening of atomic transitions is much less than Doppler width, or as dense gas, where dipole broadening is much more than Doppler width. According to our experiments the dipole broadening in rarefied gas does not depend on the optical excitation. This behavior is in a good agreement with predictions of standard theory for impact atomic collisions. In excited dense gas we observed the strong reduction of the dipole broadening. These experimental results are not described by standard theory for impact collisions. We suggested a simple description of the optical properties for excited dense gas.