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Photoionization of He - a Field Theoretic Approach

100%

Bhattacharyya S., Mitra S.

Acta Physica Polonica A

2001

vol. 100

issue 4

505-516

The present paper deals with the field theoretic study of single ionization cross-sectionsσ_{ph} and σ_C of helium due to photoelectric effect and the Compton scattering, respectively, by photons of energy lying between 0-12 keV. In this energy range,σ_{ph} gradually decreases with energy whileσ_C gradually increases. There is a crossover point around 6.5 keV where σ_{ph}=σ_C=10^{-24} cm^2. Near about this crossover point σ_{ph} andσ_C curves are like mirror images. The ratio σ_C/σ_{ph} lies between 0.3 to 1.5 in the energy range under consideration. The present results are compared with existing theoretical results.

Angular Differential Cross-Section for Electron Transfer in ION-ION Collision

81%

Bhattacharyya S., Bhattacharyya S., Mitra S.

Acta Physica Polonica A

1998

vol. 93

issue 4

601-610

Angular differential cross-sections for the formation of He^{0} in collision between fast He^{+} ions are calculated using distorted wave Coulomb-Born approximation. The interaction potentials satisfy necessary Coulomb boundary conditions. In absence of any other theoretical results the present results are compared with the existing experimental data.

Population Loss in Closed Optical Transitions οf Rb and Cs Atoms Confined in Micrometric Thin Cells

42%

Biancalana V., Cartaleva S., Dancheva Y., Gosh P., Mariotti E., Mitra S., Moi L., Petrov N., Ray B., Sarkisyan D., Slavov D.

Acta Physica Polonica A

2009

vol. 116

issue 4

495-497

We present the first experimental observation of narrow dips in the fluorescence profiles of completely closed hyperfine transitions in Rb vapor at high atomic density, which is attributed to the depolarization of the excited state. Moreover, at low atomic density, a narrow peak on the top of the fluorescence profile is demonstrated, centered at the completely closed transition within the D_{2} line of Cs. Experiments are performed in thin (700 μm) alkali cell by single light beam spectroscopy. The cell is filled with Cs containing a small portion of Rb.

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3 Acta Physica Polonica A

1 2009

1 2001

1 1998

3 Mitra S.

2 Bhattacharyya S.

1 Biancalana V.

1 Cartaleva S.

1 Dancheva Y.

1 Gosh P.

1 Mariotti E.

1 Moi L.

1 Petrov N.

1 Ray B.

1 Sarkisyan D.

1 Slavov D.

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Photoionization of He - a Field Theoretic Approach

Angular Differential Cross-Section for Electron Transfer in ION-ION Collision

Population Loss in Closed Optical Transitions οf Rb and Cs Atoms Confined in Micrometric Thin Cells