Optics and Spectroscopy

Identification of Optical Magnetic Resonances Generated in a Neon Discharge by Coherent Transitions of Spatially Separated Isotopically Different Atoms

Э. Г. Сапрыкин

Published Sep 1, 2023• 0 citations

Abstract

Abstract Infrared (IR) transitions are identified in the neon spectrum in the range 0.76–15.8 μm, they generate resonances due to quadrature field synchronization of spatially separated isotopically different atoms. The use of numerical methods for the analysis of low-contrast IR resonances made it possible to estimate the previously unknown isotopic shifts of their parent transitions levels. A change in the amplitude sign of quadrature optical-magnetic resonances with a change in the isotopic shift sign of the transitions that generate them is found, and the dependence of the lifetime of such coherent atom pairs on the transitions wavelength is recorded, showing an unusual reaching the plateau as the wavelength decreases. It is assumed that this is due to expansion of the response time of the neighboring excited atoms of the isotopic pair to their fields interference.

DOI: 10.1134/s0030400x23070147

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Optics and Spectroscopy

Identification of Optical Magnetic Resonances Generated in a Neon Discharge by Coherent Transitions of Spatially Separated Isotopically Different Atoms

Э. Г. Сапрыкин

Published Sep 1, 2023• 0 citations

Publisher

Abstract

DOI: 10.1134/s0030400x23070147

Related papers

Identification of optical magnetic resonances generated in a neon discharge by coherent transitions of spatially separated isotopically different atoms

Э. Г. Сапрыкин

Infrared (IR) transitions are identified in the neon spectrum in the range 0.76-15.8 μm, they generate resonances due to quadrature field synchronization of spatially separated isotopically different atoms. The use of numerical methods for the analysis of low-contrast IR resonances made it possible to estimate the previously unknown isotopic shifts of their parent transitions levels. A change in the amplitude sign of quadrature optical-magnetic resonances with a change in the isotopic shift sign of the transitions that generate them is found, and the dependence of the lifetime of such coherent atom pairs on the transitions wavelength is recorded, showing an unusual reaching the plateau as the wavelength decreases. It is assumed that this is due to expansion of the response time of the neighboring excited atoms of the isotopic pair to their fields interference. Keywords: neon, IR transitions, field interference, coherent atom pairs.Infrared (IR) transitions are identified in the neon spectrum in the range 0.76-15.8 μm, they generate resonances due to quadrature field synchronization of spatially separated isotopically different atoms. The use of numerical methods for the analysis of low-contrast IR resonances made it possible to estimate the previously unknown isotopic shifts of their parent transitions levels. A change in the amplitude sign of quadrature optical-magnetic resonances with a change in the isotopic shift sign of the transitions that generate them is found, and the dependence of the lifetime of such coherent atom pairs on the transitions wavelength is recorded, showing an unusual reaching the plateau as the wavelength decreases. It is assumed that this is due to expansion of the response time of the neighboring excited atoms of the isotopic pair to their fields interference. Keywords: neon, IR transitions, field interference, coherent atom pairs.

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Joel H. Parks, Ali Javan

The interaction of an intense optical-maser field with excited atoms in a gas discharge leads to a considerable change in the population of those levels which are resonant at the maser frequency. This will cause a change in the population of other levels that are connected to the maser levels through collision-induced nonradiative as well as radiative transitions. Using the 1.15-\ensuremath{\mu} optical maser, these effects have been studied in detail for the $2s$ levels of neon where the changes are completely due to collisions. By analyzing the intensity changes in spontaneous emission originating from a gas-discharge cell placed within the maser resonator, we have observed the approach to a partial thermalization of two closely spaced levels. In this way we have been able to obtain the atomic-collision cross section for excitation transfer between the $2{s}_{2}$ and $2{s}_{3}$ levels. In pure neon this has been found to be ${\ensuremath{\sigma}}_{23}=(2.3\ifmmode\pm\else\textpm\fi{}0.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}16}$ ${\mathrm{cm}}^{2}$ . For a helium-neon mixture the measured cross section is ${\ensuremath{\sigma}}_{23}=(1.8\ifmmode\pm\else\textpm\fi{}0.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}16}$ ${\mathrm{cm}}^{2}$ . The experimental method used to determine these cross sections eliminates the uncertainties caused by the effects of electron-atom collisions and radiative cascade. These techniques also yield the ratio of the Einstein coefficients for the transitions $2{s}_{2}\ensuremath{\rightarrow}2{p}_{10}$ and $2{s}_{3}\ensuremath{\rightarrow}2{p}_{10}$. The measured ratio is $\frac{{A}_{2}}{{A}_{3}}=3.0\ifmmode\pm\else\textpm\fi{}0.4$.The interaction of an intense optical-maser field with excited atoms in a gas discharge leads to a considerable change in the population of those levels which are resonant at the maser frequency. This will cause a change in the population of other levels that are connected to the maser levels through collision-induced nonradiative as well as radiative transitions. Using the 1.15-\ensuremath{\mu} optical maser, these effects have been studied in detail for the $2s$ levels of neon where the changes are completely due to collisions. By analyzing the intensity changes in spontaneous emission originating from a gas-discharge cell placed within the maser resonator, we have observed the approach to a partial thermalization of two closely spaced levels. In this way we have been able to obtain the atomic-collision cross section for excitation transfer between the $2{s}_{2}$ and $2{s}_{3}$ levels. In pure neon this has been found to be ${\ensuremath{\sigma}}_{23}=(2.3\ifmmode\pm\else\textpm\fi{}0.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}16}$ ${\mathrm{cm}}^{2}$. For a helium-neon mixture the measured cross section is ${\ensuremath{\sigma}}_{23}=(1.8\ifmmode\pm\else\textpm\fi{}0.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}16}$ ${\mathrm{cm}}^{2}$. The experimental method used to determine these cross sections eliminates the uncertainties caused by the effects of electron-atom collisions and radiative cascade. These techniques also yield the ratio of the Einstein coefficients for the transitions $2{s}_{2}\ensuremath{\rightarrow}2{p}_{10}$ and $2{s}_{3}\ensuremath{\rightarrow}2{p}_{10}$. The measured ratio is $\frac{{A}_{2}}{{A}_{3}}=3.0\ifmmode\pm\else\textpm\fi{}0.4$.

Physical ReviewAug 30, 196544 citations

Isotopic shift, pressure shift, and pressure broadening of the 7d′ states of neon using Doppler-free two-photon absorption spectroscopy

M. M. Salour

Doppler-free two-photon transitions between the $3s$ , $J=2$ metastable state and the subconfiguration $7{d}^{\ensuremath{'}}$ of neon are studied with a pulsed-dye-laser oscillator-amplifier system which was synchronized with a chopped rf discharge in neon vapor. The isotopic shifts for these transitions are measured, and based on these measurements we have made a systematic study of Ne-Ne and Ne-He collisional broadening and shift of these very narrow Doppler-free two-photon resonances.Doppler-free two-photon transitions between the $3s$, $J=2$ metastable state and the subconfiguration $7{d}^{\ensuremath{'}}$ of neon are studied with a pulsed-dye-laser oscillator-amplifier system which was synchronized with a chopped rf discharge in neon vapor. The isotopic shifts for these transitions are measured, and based on these measurements we have made a systematic study of Ne-Ne and Ne-He collisional broadening and shift of these very narrow Doppler-free two-photon resonances.

Physical Review AFeb 1, 197816 citations

2s

levels of neon where the changes are completely due to collisions. By analyzing the intensity changes in spontaneous emission originating from a gas-discharge cell placed within the maser resonator, we have observed the approach to a partial thermalization of two closely spaced levels. In this way we have been able to obtain the atomic-collision cross section for excitation transfer between the

2{s}_{2}

and

2{s}_{3}

levels. In pure neon this has been found to be ${\ensuremath{\sigma}}_{23}=(2.3\ifmmode\pm\else\textpm\fi{}0.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}16}$

{\mathrm{cm}}^{2}

. For a helium-neon mixture the measured cross section is ${\ensuremath{\sigma}}_{23}=(1.8\ifmmode\pm\else\textpm\fi{}0.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}16}$

{\mathrm{cm}}^{2}

. The experimental method used to determine these cross sections eliminates the uncertainties caused by the effects of electron-atom collisions and radiative cascade. These techniques also yield the ratio of the Einstein coefficients for the transitions $2{s}_{2}\ensuremath{\rightarrow}2{p}_{10}$ and $2{s}_{3}\ensuremath{\rightarrow}2{p}_{10}$. The measured ratio is $\frac{{A}_{2}}{{A}_{3}}=3.0\ifmmode\pm\else\textpm\fi{}0.4$.

Doppler-free two-photon transitions between the

3s

J=2

metastable state and the subconfiguration $7{d}^{\ensuremath{'}}$ of neon are studied with a pulsed-dye-laser oscillator-amplifier system which was synchronized with a chopped rf discharge in neon vapor. The isotopic shifts for these transitions are measured, and based on these measurements we have made a systematic study of Ne-Ne and Ne-He collisional broadening and shift of these very narrow Doppler-free two-photon resonances.