Abstract: | Simulated contours of self-reversed lines of Tl at 535 nm (72S1/2−62P3/2) and 378 nm (72S1/2-62P1/2) in alternating-current closed-arc radiation in mercury vapor with an addition of Tll were compared with experimental contours.
It is shown that while a single self-reversed contour has many different sets of model parameters that ensure coincidence
of experimental and calculated profiles, in the case of operation with a large data file of contours that correspond to different
directions of observation along chords perpendicular to the discharge axis, and with different lines that have a common level,
such a set of parameters becomes virtually unique. Instantaneous spatial distributions of Hg and Tl atoms in the ground state
and of Tl atoms in the 62P3/2 state are determined and the parameters of the van der Waals broadening of the 72S1/2 level are found. It is shown that a considerable “red” shift of absorption contours in the outer layers of the discharge
is observed. The results obtained contradict the presumed existence of local thermodynamic equilibrium in the given discharge.
Reported at the Conference “Plasma Physics and Plasma Technologies,” Minsk, September 15–19, 1997
Petrozavodsk State University, 33, Lenin Ave, Petrozavodsk, 185640, Russia. Translated from Zhurnal Prikladnoi Spektroskopii,
Vol. 65, No. 5, pp. 761–768, September–October, 1998. |