0000000000527543

AUTHOR

C. Leroy

ATOM-WALL COLLISIONS INFLUENCE ON DARKLINE ATOMIC RESONANCES IN SUBMICRON THIN VAPOUR CELLS.

Recently it was demonstrated that miniaturization of alkali cells, i.e. the use of an extremely thin cell (ETC) for the applications using the electromagnetically induced transparency (EIT) effect, despite to intuitive expectation, does not cause a strong broadening of the dark-line (DL) linewidth. Here we present the conditions when a strong broadening of DL linewidth (more than by 10 times) can be easily observed due to atom-wall collisions influence and this could be a convenient and robust tool for atomwall (i.e. ETC's window material/temperature) collisions study. We present experimental and theoretical results on EIT realized in a Λ- system of 85Rb, D2 line, 5S-5P-5S for a Rb vapour c…

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Sub-Doppler Spectroscopy by Using Sodium Nanocell

International audience; We present for the first time the results of the sub-Doppler spectroscopy realized with a nanocell filled with a Sodium metal. The thickness L of the gap between the windows (which determines the length of the atomic vapor column) has a wedge in the vertical direction varying from 100 to 900 nm. It is demonstrated that the use of a nanocell with the thickness L=lambda/2 and L=lambda, where lambda is the wavelength of the dye laser radiation resonant with D2 line of Sodium, allows one to provide sub-Doppler spectroscopy of the Transmission and Fluorescence spectra of D2 lines of Sodium (lambda ~ 590 nm). A cw dye laser radiation with the linewidth of ~1 MHz and tunabl…

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From atomic to molecular Bose-Einstein condensates: a physically realizable term-crossing model for cold atom association

Using an exact third-order NL di®erential equation for the molecular state probability, we develop a variational approach which enables us to construct highly accurate analytic approximations describing time dynamics of the coupled atom-molecular system in each of the interaction regimes. We show that the approximation describing time evolution of the molecular state probability both in the weak interaction limit and in the large detuning regime of the strong interaction limit can be written as a sum of two distinct terms; the ¯rst one, being a solution to a limit ¯rst-order NL equation, e®ectively describes the process of the molecule formation while the second one, being a scaled solution…

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On the ”Expanded” Local Mode Approach and Isotopic Effect (CH2D2/CH3D/CHD3) in the Methane Molecule

Earlier derived, [1] - [3], for the XY2 (C2v and XY3 (C3v molecules) ”expanded local mode model” is applied to the methane-type, XH4, molecules. On the base of using os specially obtained value of the ambiguity parameter, sin gamma , simple value of all transformation coefficients, l_{N \alpha \lambda}, were obtained for the CH4 molecule. It gave us possibility, on the one hand, 1). to derive simple relations between different spectroscopic parameters (harmonic frequencies, anharmonic parameters and vibrational tetrahedral coefficients, rotational-vibrational and rotational tetrahedral coefficients) of the CH4 molecule, and, on the other hand, 2). on the base of the genegal isotopic substit…

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