Emission anomalous optical magnetic resonances in a mixture of even neon isotopes
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MOLECULES, OPTICS
Emission Anomalous Optical Magnetic Resonances in a Mixture of Even Neon Isotopes E. G. Saprykina, V. A. Sorokina,b,*, and A. M. Shalagina,b a
Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, Universitetskii pr. 1, Novosibirsk, 630090 Russia bNovosibirsk State University, Novosibirsk, 630090 Russia *email: [email protected] Received September 14, 2012
Abstract—Unusual resonances have been detected in the dependence of the discharge glow in neon on the longitudinal magnetic field. The resonances appear in fairly high magnetic fields and are observed only at low gas pressures and exclusively in a mixture of 20Ne and 22Ne isotopes. This phenomenon is an evidence of col lective resonant radiation processes involving atoms of different neon isotopes. DOI: 10.1134/S1063776113030187
1. INTRODUCTION Attention to the dependence of the spontaneous emission of an atom on its surroundings was drawn long ago in [1]. It was shown that placing an atom in a resonator could quantitatively and qualitatively change both the spectrum and dynamics of the spon taneous emission. The question of whether another atom could serve as a resonator was raised in more resent publications. One of the most prominent effects in which the resonant properties of neighboring atoms manifest themselves is the Dicke effect [2]. It consists in the collective spontaneous emission of an ensemble of particles (superradiance) with population inversion. A detailed description of the Dicker superradiance and related phenomena can be found in the review [3]. In recent years, the emission of light by a set of two explicitly noninteracting stationary atoms or mole cules has been studied in a number of theoretical works [4–6]. The fact that the distance between the particles could be appreciably larger than the wavelength of the resonant photons was taken into account. In [4, 6], the theoretical analysis was carried out under initial con ditions where only one of the two identical atoms was in an excited state, which is typical of absorbing media. The equality of the particle transition frequen cies creates resonance conditions for the absorption of the emitted photon, which inevitably produces collec tive superposition quantum states of the atomic pair. As a result, the dynamics of the spontaneous decay of such a collective state becomes nonexponential and the spontaneous emission spectrum ceases to have a Lorentzian shape. For dissimilar particles with differ ent transition frequencies, the resonance conditions are violated and the atoms of the pair radiatively relax independently. The fact that the pair of atoms con sisted of different isotopes and the transition frequen
cies were adjusted using the Zeeman effect was explic itly taken into account in [5]. The experimental observability of paired radiation processes for pure materials is very limited, because there is a significant masking factor—the emission of an ensemble of isolated atoms. The situation changes radically when using a mix
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