Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 7

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1
Content available remote

Investigations of Electron Impact Induced Excitations from 3P to Higher Lying Levels of Sodium

100%
Stacewicz T.
Acta Physica Polonica A
|
1993
|
vol. 84
|
issue 2
259-269
EN
Results of measurements of the rate constants for the electron impact induced transitions between 3P and higher excited 3D, 4P, and 5S levels are presented. The experimental data were corrected for the radiation imprisonment using a new model of this effect.
2
Publication available in full text mode
Content available

Investigation of Collisions between Li(2P) Atoms and Electrons: Excitation of 4l Levels

63%
Pietruczuk A., Stacewicz T.
Acta Physica Polonica A
|
2003
|
vol. 103
|
issue 5
423-432
EN
Results of measurements of rate constants for transitions between 2P → 4S, 2 P → 4P, and 2P → 4D levels of lithium are presented. The investigations were performed in laser induced plasma. The results were compared with calculations based on Born and close coupling approach.
3
Content available remote

Investigation of Radiation Trapping in Atomic Vapour Excited by Weak Resonant Laser Pulses

63%
Chorąży J., Stacewicz T.
|
|
vol. 96
|
issue 3-4
383-390
EN
We present results of our investigations on radiation trapping in sodium vapour excited to 3P level by weak laser pulses. The evolution of the fluorescence signal as well as the evolution of excited atoms distribution were studied using the Monte Carlo method. Some predictions of these investigations were checked experimentally.
4
Publication available in full text mode
Content available

Application of quantum cascade lasers to trace gas detection

51%
Bielecki Z., Wojtas J., Stacewicz T., Mikołajczyk J.
|
2015
|
issue 2
5
Publication available in full text mode
Content available

Fluorescence of Sodium Vapour Excited by 330 nm Laser Pulses

51%
Gorbunov N., Kozłowski P., Nowak K., Stacewicz T.
Acta Physica Polonica A
|
2001
|
vol. 99
|
issue 5
531-537
EN
We report results of investigation on the fluorescence induced in sodium vapour by pulses of laser light tuned near the 3S → 4P transition (330 nm). The fluorescence was observed in perpendicular and parallel directions in respect to the laser beam. A depletion of fluorescence intensity corresponding to the 5D → 3P transition (498 nm) was observed along the laser beam. We explain this effect as a result of reabsorption that is caused by intense population of the 3P level due to cascade stimulated processes. The most intense depletion occurs about 20 ns after the laser pulse and it corresponds to the moment of maximal population of the 3P level.
6
Content available remote

Application of Quantum Cascade Lasers in Nitric Oxide and Nitrous Oxide Detection

39%
Wojtas J., Bielecki Z., Stacewicz T., Mikolajczyk J., Medrzycki R., Rutecka B.
Acta Physica Polonica A
|
2011
|
vol. 120
|
issue 4
794-797
EN
Application of quantum cascade lasers in NO and N_2O sensor is described. Cavity enhanced absorption spectroscopy was used for this purpose. The detection was performed at vibronic molecular transitions in spectral regions of 5.23-5.29 μm and 4.46-4.54 μm for NO and N_2O, respectively. In order to avoid interferences by the gases contained in atmosphere (H_2O, CO_2) the lines of 5.263 μm for NO and 4.530 μm for N_2O were selected. Our two channel sensor is designated for simultaneous detection of both compounds. Each channel consists of single mode quantum cascade laser, optical cavity, and a photodetection module. The lasers were precisely tuned to the wavelength of interest. Optical cavities were built with spherical mirrors of high reflectance. The signals from the cavities outputs were registered with specially developed low noise detection modules.
7
Content available remote

Nitrogen Oxides Optoelectronic Sensors Operating in Infrared Range of Wavelengths

39%
Wojtas J., Bielecki Z., Stacewicz T., Mikolajczyk J., Rutecka B., Medrzycki R.
Acta Physica Polonica A
|
2013
|
vol. 124
|
issue 3
592-594
EN
Investigation of nitric oxide and nitrous oxide optoelectronic sensors is described. The detection of both components was done by measurement of absorption that occurs due to transition between vibronic molecular transitions. The improvement of the sensitivity was achieved due to application of cavity enhanced absorption spectroscopy. Two optical cavities (each one for each gas) built of high reflectance spherical mirrors were used. While the spectra of observed transitions are situated in mid-infrared range, two single mode quantum cascade lasers were applied. Their narrow emission lines were precisely tuned to the absorption lines of both investigated gases. The measurement of different mixtures of Ar-NO and Ar-N_2O within the range from 100 ppb to 10 ppm was performed. The relative uncertainty of the results did not exceed the level of 13%.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.