Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Journal of Physics B Atomic and Molecular Physics

Resonant free-free absorption by electrons in the field of neon atom

P J K Langendam, Mihai Gavrila, J P J Kaandorp, Marnix J. van der Wiel

Published Oct 12, 1976• 30 citations
Publisher

Abstract

Simultaneous impact of electrons and photons on neon is shown to lead to resonant transitions between pairs of short-lived negative-ion states. One particular negative-ion state at 18/95 eV has been populated by transitions from two different lower lying states ( lambda =5897 and 4511 AA). The decay of the upper state was observed through the Ne I emission at 5882 and 6030 AA.

DOI
10.1088/0022-3700/9/15/005

Related papers

Resonance broadening in neon at low densities

P. E. G. Baird, Keith R. Burnett, Roland M. Damaschini +2 more

The spectral profile of the strongly resonance-broadened transition lambda 585.2 nm of Ne I has been studied in absorption. A narrow-band tunable dye laser probed a weak discharge in natural neon cooled with liquid nitrogen. The Lorentzian width extrapolated to zero density was found to be 108+or-20 MHz, consistent with the value 114+or-4 MHz calculated from the natural widths of the levels. There is no indication of the excess width found in earlier emission experiments in helium and neon. A preliminary result of (1.7+or-0.2)10 -21 MHz atom -1 m 3 was obtained for the broadening constant of lambda 585.2 nm in absorption at 77K. This is consistent with the value found in emission.

Journal of Physics B Atomic and Molecular Physics•Mar 14, 1979•11 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.

Physical Review A•Feb 1, 1978•16 citations

Observation in a discharge of short-lived atomic states by intracavity absorption

Gilbert O. Brink, S. M. Heider

Optical absorption in short-lived excited states of atomic neon caused by dye-laser intracavity absorption has been observed. The states were excited by a microwave discharge in neon gas produced by a microwave cavity located inside the optical cavity of the dye laser. All transitions arising from the 2p manifold of states that are usually seen in emission are here seen in absorption. Best theoretical estimates of the number density of each of the 2p states in the discharge is about 10(5)-10(7)/cm(3), and the mean lifetime of the states is about 19 x 10(-9) sec.

Optics Letters•Aug 1, 1981•7 citations

Free-free experiments: dressed-atom effects during inelastic electron scattering

Nicholas L S Martin, B N Kim, C.M. Weaver +1 more

Synopsis Experiments and theory will be presented for the emission/absorption of 1.17 eV photons by electrons during the electron-impact excitation of a helium target in a laser field.

Journal of Physics Conference Series•Jan 1, 2020•0 citations

Collision-Induced Transitions within Excited Levels of Neon

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 $\frac{{A}_{2}}{{A}_{3}}=3.0\ifmmode\pm\else\textpm\fi{}0.4$.

Physical Review•Aug 30, 1965•44 citations

Double Resonance Phenomena of Neon in Spontaneous Emission from Lower Laser Level

T. Yabuzaki, Toru Ogawa

Double resonance phenomena of a gaseous laser in the spontaneous emission from the lower laser level is studied, especially for the case of the He-Ne laser operating at 0.633 µm-π transitions. Magnetic resonances of the laser levels 3 s 2 and 2 p 4 of neon make the intensity of the 0.609 µm line from the 2 p 4 level increased and decreased, respectively, and can be observed even when the g -factors of these levels are the same. The linewidths of the resonance lines depend only upon the relaxation of alignment.

Journal of the Physical Society of Japan•Mar 1, 1973•2 citations
Simultaneous impact of electrons and photons on neon is shown to lead to resonant transitions between pairs of short-lived negative-ion states. One particular negative-ion state at 18/95 eV has been populated by transitions from two different lower lying states ( lambda =5897 and 4511 AA). The decay of the upper state was observed through the Ne I emission at 5882 and 6030 AA.
The spectral profile of the strongly resonance-broadened transition lambda 585.2 nm of Ne I has been studied in absorption. A narrow-band tunable dye laser probed a weak discharge in natural neon cooled with liquid nitrogen. The Lorentzian width extrapolated to zero density was found to be 108+or-20 MHz, consistent with the value 114+or-4 MHz calculated from the natural widths of the levels. There is no indication of the excess width found in earlier emission experiments in helium and neon. A preliminary result of (1.7+or-0.2)10 -21 MHz atom -1 m 3 was obtained for the broadening constant of lambda 585.2 nm in absorption at 77K. This is consistent with the value found in emission.
Doppler-free two-photon transitions between the 3s3s3s, J=2J=2J=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.
Optical absorption in short-lived excited states of atomic neon caused by dye-laser intracavity absorption has been observed. The states were excited by a microwave discharge in neon gas produced by a microwave cavity located inside the optical cavity of the dye laser. All transitions arising from the 2p manifold of states that are usually seen in emission are here seen in absorption. Best theoretical estimates of the number density of each of the 2p states in the discharge is about 10(5)-10(7)/cm(3), and the mean lifetime of the states is about 19 x 10(-9) sec.
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 2s2s2s 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 2s22{s}_{2}2s2​ and 2s32{s}_{3}2s3​ levels. In pure neon this has been found to be ${\ensuremath{\sigma}}_{23}=(2.3\ifmmode\pm\else\textpm\fi{}0.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}16}$ cm2{\mathrm{cm}}^{2}cm2. For a helium-neon mixture the measured cross section is ${\ensuremath{\sigma}}_{23}=(1.8\ifmmode\pm\else\textpm\fi{}0.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}16}$ cm2{\mathrm{cm}}^{2}cm2. 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 $\frac{{A}_{2}}{{A}_{3}}=3.0\ifmmode\pm\else\textpm\fi{}0.4$.
Double resonance phenomena of a gaseous laser in the spontaneous emission from the lower laser level is studied, especially for the case of the He-Ne laser operating at 0.633 µm-π transitions. Magnetic resonances of the laser levels 3 s 2 and 2 p 4 of neon make the intensity of the 0.609 µm line from the 2 p 4 level increased and decreased, respectively, and can be observed even when the g -factors of these levels are the same. The linewidths of the resonance lines depend only upon the relaxation of alignment.