Ultra-narrow spectroscopic cells in atomic spectroscopy: reflection, transmission, fluorescence, and nonadiabatic transitions at the walls

22nd International Conference on Spectral Line Shapes

Pazgalev, A.^1 ; Sarkisyan, D.^2 ; Cartaleva, S.^3 ; Przhibelskii, S.^4 ; Vartanyan, T.^4

Ioffe Phys.-Technical Institute, Russian Academy of Sciences, Politekhnicheskaya st. 26, St. Petersburg

194021, Russia^1

Institute for Physical Research, NAS of Armenia, Ashtarak

0203, Armenia^2

Institute of Electronics, BAS, boul. Tzarigradsko shosse 72, Sofia

1784, Bulgaria^3

ITMO University, Kronverkskiy pr. 49, St. Petersburg

197101, Russia^4

关键词: Experimental evidence;    Hyperfine structure;    Non-adiabatic transitions;    Nonlinear optical technique;    Reflection and transmission;    Spectroscopic cells;    Spectroscopic tool;    Velocity selective;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/548/1/012063/pdf
DOI  :  10.1088/1742-6596/548/1/012063

来源: IOP

【 摘 要 】

Ultra-narrow cells with the thicknesses in the range from several wavelengths to the small fractions of the wavelength brought a number of new opportunities for atomic spectroscopy. Depending on the cell thickness, spectral lines recorded in ultra-narrow cells are either Doppler-free or Doppler-broadened. With careful selection of the cell thickness hyperfine structure may be easily resolved without resorting on the multibeam nonlinear optical techniques. Moreover, frequent collisions with the walls leads to the important modifications of velocity selective optical pumping resonances. Finally, ultra-narrow cells provide with the unique opportunity to study collisions of the excited atoms with the solid surfaces. In this contribution several examples of the use of the ultra-narrow spectroscopic cells filled with the alkali atomic vapour is presented. First, we discuss general aspects of the transient polarisation that defines all peculiarities of an ultra-narrow cell as a spectroscopic tool. Second, we demonstrate the resolution of the magnetic sublevels in the transition from Zeeman to Paschen-Back regime in the Cs hyperfine structure. Third, new aspects of velocity selective optical pumping resonances in reflection and transmission of resonant radiation by the 6 wavelengths thick cell filled with Cs are discussed. Forth, the experimental evidences of the nonadiabatic transitions between excited states of Rb atoms in the course of collisions with the sapphire surface are presented.