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EGAS41 - Swansea University

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41 st EGAS CP 204 Gdańsk 2009<br />

Interferometric study of collision-time asymmetry and<br />

speed-dependent effects on the 748.8 nm selfbroadened neon<br />

line<br />

A. Urbanowicz ∗ , A. Bielski, R.S. Trawiński, D. Lisak, R. Ciury̷lo<br />

Instytut Fizyki, Uniwersytet Miko̷laja Kopernika, ul. Grudzi¸adzka 5, 87-100 Toruń, Poland<br />

∗ Corresponding author: adamu@fizyka.umk.pl,<br />

Using an interferometric method, detailed analysis of profiles of the selfbroadened 748.8<br />

nm Ne line emitted from the glow discharge in neon was performed which revealed departures<br />

from ordinary Voigt profile. These departures are shown to be consistent with fits of<br />

speed-dependent asymmetric Voigt profile to experimental profiles. It was shown that the<br />

neglect of the correlation between Doppler and collsional broadening may cause errors in<br />

the values in determined line shape parameters. Coefficients of the pressure broadening,<br />

shift and collision-time asymmetry are determined and compared with those calculated<br />

in the adiabatic approximation for the van der Waals and Lennard-Jones potentials.<br />

264

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