Line intensity and broadening in the In III spectrum

Abstract

Placement of thin indium (In) cylindrical plates at both ends of the narrow linear part of the glass discharge tube, far from the brass discharge electrodes, provides efficient erosion of the In atoms, which results in the high density of the indium vapour in argon and helium plasmas. In pulsed argon and helium discharges at 133 and 400 Pa flowing pressures, respectively, intense radiation has been observed in the doubly ionized indium (In III) spectrum ranging between 200 and 660 nm wavelengths. A notable after-radiation in the In III spectrum is attributed to the helium metastable atoms. Stark widths and shifts are measured and presented for several prominent In III lines.

The Third Spectrum of Indium: In III

“…If marked as # then the given gA values are too unreliable for the transitions whose cancellation factor |CF| < 0.10 in our calculations with Cowan's code [12]. i Reference to the source: B-Bhatia et al [6]; B, TW-Wavelength from this work; K-Kaufman et al [7]; R-Ryabtsev et al [9]; S-Skočić et al [10]; TW-this work.…”

“…The first work on the third spectrum of indium was done by Rao et al [1], followed by Lang [2], Douglas [3] and Nodwell [4]. Rao et al [1] identified 12 lines in the wavelength region 2983-5918 Å and established 13 levels belonging to the 4d 10 (5s, 6s, 7s, 5p, 6p, 5d, 6d, 4f, 5f and 5g) configurations. However, only six of those levels could be verified by later workers [2][3][4].…”

“…Bhatia [6] investigated the In III spectrum more comprehensively using a 3-m normal incidence vacuum spectrograph in the range 340-2300 Å with a 1200 lines/mm grating giving a reciprocal dispersion of 2.775 Å/mm and a prism spectrograph in the region 2300 Å to 9500 Å with a disruptive electrodeless discharge. He revised and extended the earlier analysis and established the levels of the 4d 10 ns (n = 5-12), 4d 10 np (n = 5-9), 4d 10 nd (n = 5-9), 4d 10 nf (n = 4-7), 4d 10 ng (n = 5-9), 4d 10 nh (n = 6-9), 4d 9 5s 2 , and 4d 9 5s5p configurations. Kaufman et al [7] studied the core-excited transition array 4d 10 5s-4d 9 5s5p in the isoelectronic sequence from In III to Te VI.…”

“…They were able to determine only 13 levels out of 28 levels of the 4d 9 5p 2 configuration. Skočić et al [10] studied Stark shifts of some prominent lines of In III (6s-6p, 6p-6d, and 4f-5d).…”

“…As mentioned above, a number of publications on In III appeared in the literature [1][2][3][4][5][6][7][8][9][10][11]. Among these, Bhatia's [6] analysis was the most comprehensive and contained a large number of one-electron configurations.…”