Search results

Search:
in the keywords: 32.90.+a

Sort By:

Limit search:

Core Polarization Effects in the Relativistic Quantum-Defect-Orbital Theory

100%

Bielińska-Wąż D., Martin I., Karwowski J.

Acta Physica Polonica A

1994

vol. 85

issue 5

805-812

The quantum-defect-orbital method has been reformulated in order to include both relativistic effects and the electron correlation described by a core polarization potential. All quantities appearing in this formulation may be evaluated analytically. A comparison with experimental results demonstrates, on one hand, significance of the relativity-correlation corrections and, on the other, inadequacy of the relativistic quantum-defect-orbital approach when indirect relativistic effects are important, i.e. when atoms contain closed shells of d electrons.

Population Inversion on Transition into the Ground State of Atoms Induced by Optical Excitation and Collisions

80%

Markov R., Plekhanov A., Shalagin A.

Acta Physica Polonica A

2002

vol. 101

issue 1

77-88

Lasing on the sodium resonance transitions (D_1 and D_2 lines) at the superluminosity regime was observed upon the non-resonance excitation in the presence of a buffer gas. Dependences of the lasing intensity on the pump radiation intensity and its frequency detuning from the frequencies of resonance transitions were examined. It was found that under the specific experimental conditions (high buffer gas pressure, sufficiently high intensity of pump radiation) upon the large positive frequency detuning of pump radiation with respect to the frequency of resonance ("working") transition, contrary to ingrained conceptions, population inversion for the "working" transition is raised. That results in the observed phenomena.

Refine search results

2 Acta Physica Polonica A

1 2002

1 1994

1 Bielińska-Wąż D.

1 Karwowski J.

1 Markov R.

1 Martin I.

1 Plekhanov A.

1 Shalagin A.

Search results

Core Polarization Effects in the Relativistic Quantum-Defect-Orbital Theory

Population Inversion on Transition into the Ground State of Atoms Induced by Optical Excitation and Collisions