EGAS41 - Swansea University

41 st EGAS CP 122 Gdańsk 2009
Speed dependence and dispersion-like asymmetry of the 326.1
nm 113 Cd line perturbed by Ar and Xe
K. Bielska ∗ , P. Mas̷lowski, A. Cygan, J. Domys̷lawska, D. Lisak, R. Ciury̷lo,
A. Bielski, J. Szudy, R.S. Trawiński
Instytut Fizyki, Uniwersytet Miko̷laja Kopernika, ul. Grudziadzka 5,
87-100 Torun, Poland
∗ Corresponding author: kasia@fizyka.umk.pl
Precise measurements of line shapes of two hyperfine-structure components (F’=1/2→
F”=1/2 and F’=3/2→F”=1/2) of the intercombination 326.1 nm line corresponding to
the 5 1 S 0 -5 3 P 1 transition for the even-odd 113 Cd isotope perturbed by argon and xenon
have been done. The laser-induced fluorescence experiment was performed using recently
upgraded digital laser spectrometer [1], which allowed us to verify available data on the
isotope structure of the line under investigation as well as to determine the value of the
hyperfine splitting of the upper state 5 3 P 1 . The analysis was performed using the speeddependent
asymmetric Voigt profile (SDAVP). Functions describing the speed-dependence
of the collisional broadening and shifting, incorporated in SDAVP, depend on assumed
interaction potential for given emitter-perturber systems. Values of the broadening, shift
and asymmetry coefficients for Cd–Ar and Cd–Xe determined in the course of a careful
analysis are reported. The influence of the assumed interaction potential as well as the
isotope and hyperfine structure on line shape parameters is discussed.
Effects due to the correlation between pressure and Doppler broadening of the 326.1 nm
line were observed for both Cd-Ar and Cd-Xe systems (the emitter to perturber mass
ratio for these systems equals to 0.35 and 1.15, respectively). Obtained values for the
dispersion-like asymmetry confirm the presence of the effect associated with the finite
time of the collision. No evidence has been found, however, for the existence of the
line-mixing asymmetry in given systems.
6x10 6
Intensity [a. u.]
4x10 6
2x10 6
Cd-Xe
p=145 Torr
0x10 0
-0.8 -0.4 0 0.4 0.8
~ ν - ν~ 0
[cm -1 ]
Figure 1: Line shape of 326.1 nm 113 Cd line perturbed by Xe at pressure 145 Torr:
circles - experimental profile, solid line - fitted SDAVP
References
[1] P. Mas̷lowski, K. Bielska, A. Cygan, J. Domys̷lawska, D. Lisak, R. Ciury̷lo, A. Bielski,
R.S. Trawiński, Eur. Phys. J. D 51, 295 (2009)
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