Continuum radiation and potentials of Na–noble gas molecules

Chéron, B.; Scheps, Richard; Gallagher, A. C.

doi:10.1063/1.431446

Cited by 177 publications

(22 citation statements)

References 17 publications

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“…[1][2][3][4][5][6] The formation of M *He n (nϭ1,...,5) exciplexes have been proposed as the cause of the quenching of fluorescence emission. 7,8 In these exciplexes the crossing between the excited and the ground state potential energy surface opens the possibility of a decay via nonradiative transitions. 9 This does not apply to the heavier alkali ͑Rb, Cs,Fr͒, where the curve crossing mentioned above is not present due to the larger atomic cores and to the stronger spin-orbit coupling.…”

Section: Introductionmentioning

confidence: 99%

Investigating the M*He exciplexes, M={Li,Na,K,Rb,Cs,Fr}: Density functional approach

Zbiri

Daul

2004

The Journal of Chemical Physics

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Potential curves for the ground and the first lowest excited states of the M He ͑where M ϭ͕Li,Na,K,Rb,Cs,Fr͖) exciplexes are calculated using the density functional theory ͑DFT͒ formalism. Relativistic calculations are carried out with and without spin-orbit ͑SO͒ coupling effect, using a zeroth order regular approximation ͑ZORA͒ approach. The depth D e and position R e parameters of the potential curves for the case without spin-orbit effect are presented and compared with other works. Potential curves for Li-He, Cs-He, and Fr-He without spin-orbit effect and Cs-He with the spin-orbit effect are shown. A bond analysis is presented too, since the central interest of the study of the exciplexes is the nature and the existence of the bonding states that are the origin of emission spectra observed experimentally for these systems.

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Section: Introductionmentioning

confidence: 99%

Investigating the M*He exciplexes, M={Li,Na,K,Rb,Cs,Fr}: Density functional approach

Zbiri

Daul

2004

The Journal of Chemical Physics

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“…The formation of bound molecules requires three-body collisions involving excited Na atoms, and so their density increases with the square of the buffer gas pressure. It is welt known that binding energy for formation of quasimolecules is the biggest, in our case in the N a -K r system [8]. Such quasimolecules can change the threshold pressure.…”

Section: Results and Interpretationmentioning

confidence: 96%

Observation of collision-induced amplified emission in Na-noble gas system

Konefal

Ignaciuk

1993

Z Phys D - Atoms, Molecules and Clusters

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Abstract.A stimulated resonance emission and stimulated Raman scattering signals have been generated in an atomic sodium and rare gas mixture by a laser tuned to the 32 Sin-32 P3/2 transition. The intensity dependence of these effects on the buffer gas pressures is obtained in the experiment. We demonstrate good qualitative agreement between experimental observations and a simple theoretical model. A new method using stimulated emission is applied to measure the cross section for the J mixing of 3P states of sodium due to collisions with noble gas atoms. Good agreement between our results and the measurements of Pitre and Krause is obtained for Ar and Kr perturbers PACS: 32.80.Wr; 32.90. +a

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“…In conclusion, it should be emphasized that pairs of alkali-metal and inert-gas atoms can be used as pairs of atoms forming molecules with repulsive-term potential curves that appear promising for attaining lasing by repulsive terms (see, for example, [96][97][98][99]). …”

Section: Zamentioning

confidence: 98%

Theoretical feasibility study of new high-efficiency continuous-wave lasers operating at electron transitions in the spectral regions from near ir to uv on the basis of unconventional mechanisms of forming the active gaseous media

et al. 2000

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This paper is a review of the results of theoretical studies related to the search for new mechanisms, which are not yet completely understood and have not been implemented so far, of forming the active laser media that offer the prospect of development of high-efficiency continuous-wave (cw) laser operating at electron transitions (in atoms or molecules) in a wide range of wavelengths (from near IR to UV). The main attention is paid to unconventional mechanisms of forming the population inversion of lasing-active levels. These mechanisms involve the intramultiplet (due to collisions with heavy particles) or ionization-induced (due to collisions with electrons) deactivation of the lowest lasing-active atomic level; the population of the upper lasing-active level as a result of three-body electron ion recombination induced by the presence of alkali impurity, with simultaneous intramultiplet decay of the lower level; the mechanism ensuring the lasing transitions between repulsing terms of the involved molecules; and the exchange of vibrational-electronic excitation (for example, exchange of two vibrational quanta of an excited hydrogen molecule for a single electronic quantum of the iodine atom).

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Continuum radiation and potentials of Na–noble gas molecules

Cited by 177 publications

References 17 publications

Investigating the M*He exciplexes, M={Li,Na,K,Rb,Cs,Fr}: Density functional approach

Investigating the M*He exciplexes, M={Li,Na,K,Rb,Cs,Fr}: Density functional approach

Observation of collision-induced amplified emission in Na-noble gas system

Theoretical feasibility study of new high-efficiency continuous-wave lasers operating at electron transitions in the spectral regions from near ir to uv on the basis of unconventional mechanisms of forming the active gaseous media

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